The Science Behind the Dodge Demon's Acceleration

This equation takes two variables and allows you to calculate your maximum possible acceleration based on your tires and your center of gravity. If you plug in all the numbers for the Dodge Demon, you get a maximum possible acceleration of 2 Gs when your center of gravity height is at about 85.5 mm. This is pretty high for a car like the Toyota Supra, which has a center of gravity height of around 500 mm. However, part of this is due to the fact that the front end will raise up as you get full load transfer to the rear, and some of that is helped by the front damper, which allows the vehicle to lift up easily. The front dampers have a setting when you're in drag mode that they have soft rebound, meaning allowing the vehicle to lift up very easily so it can pull away from those dampers quickly.

This quick transition and stiff rear suspension make for a challenging rear-wheel drive system. The cool thing about this equation is that you can use it to calculate real-world numbers. This is going to illustrate why rear-wheel drive is so challenging. On a prepped surface, knowing that we have a maximum frictional coefficient of 2, the average acceleration of the Demon down that 0-60 was 1.5 Gs, absolutely bomb ERS, which gives it a 0-60 time of 1.8 seconds on a prep surface. We calculated earlier that this is equivalent to a quarter-mile time of 9.3 seconds. Compare that to the Tesla Model S Plaid, which has a 0-60 time of 2.13 seconds on a prepared surface, significantly quicker than the Demon.

However, if we go to a road or public road, a non-prepped surface, let's give this thing the benefit of the doubt and say it's the highest frictional coefficient of any tire out there that you can put on a production car. At 1.5, the real limit is somewhere around 1.4, but they have surpassed that with these drag radials. So, let's say it's 1.5 well, that will give them because of the location of the center of gravity using this equation a maximum acceleration of about 1.1 Gs. Meaning in the real world, using really nice tires but on non-prepared surface, they're going to have a 0-60 time of about 2.5 seconds versus the Tesla Plaid, which we know has already done it in 2.3 seconds.

The second you go out into the real world, this is no longer the world's quickest production car; it's only on that prepared surface with certain circumstances that it can achieve that number. Just for fun, let's look at some other circumstances and what numbers we can expect if you're driving in the rain or the snow. If you have a frictional coefficient of 8, the maximum acceleration that the Dodge Demon is going to be able to achieve is 44 Gs giving it a 0-60 time of 6.2 seconds. Compare that to the Tesla Model S Plaid if you've got that frictional coefficient of 8, it's going to be able to achieve a 0-60 time of 3.4 seconds.

Things get even worse in the snow; our maximum acceleration given a frictional coefficient of .3 is now just 0.14 Gs and our 0-60 time is 19.5 seconds versus the Tesla at 9.1 seconds, which is less than half. So, quick summary on a prepared surface, the 0-60 is somewhere around 1.8 seconds, which is absolutely nuts in the real world I doubt we're going to see a 0-60 better than 2.5 seconds. And then once again, this car is incredibly cool; you don't have to be misleading about it to explain how cool it is.

So, my advice to Dodge is simply let out the real numbers and release the real numbers; let a third-party test this thing it'd be awesome if you did.

"WEBVTTKind: captionsLanguage: enhello everyone and welcome the Dodge Demon 170 has numbers that are simply mindblowing over 1,000 horsepower accelerates at over 2 G's never done before in a production car it generates cylinder pressures equal to the weight of about 7 and 1 12 Dodge demons pressing down on a single piston the fuel injectors are capable of providing 164 gallons of fuel per hour for context that's more than four times the maximum fuel flow of a modern F1 engine which makes similar power so yeah okay surprise maybe the demon isn't fuel efficient but it throws down a 0 to 60 of 1.66 seconds a production car record and that's a number we can certainly trust right no of course not because as is increasingly common incredibly cool engineering must be viewed through the distorted lens of mislead marketing the 0 to 60 is with roll out and if you've watched this channel you know how dumb I think rollout is the industry practice of deleting the first foot of acceleration essentially it's starting the 0 to 60 clock after the car has reached about 6 m per hour you would probably call that a 6 to 60 rightly so but within the industry we'd call that a 0 to 60 with roll out and honestly most of the time we forget to say that last bit now I'm just some idiot on the internet right why should you listen to my opinion and truthfully you shouldn't my opinion doesn't matter don't listen to it but do listen to the opinion of the current CEO of Dodge and what he said about roll out back in 2017 as it related to the previous Dodge Demon quote rollouts aren't a fair way to do 0 to 60 honestly a real 0 to 60 is from a dead stop wait what so in 2017 Dodge cared about portraying their numbers in a fair way so when they gave the 0 to 60 of the 2018 demon at 2.3 seconds it was truly from zero no roll out nonsense but 6 years later you cannot even find the word roll out mentioned once on the public demon page or on the media page they admit it only when you ask and they won't provide the number without roll out the current CEO of Dodge has been quoted saying roll out isn't fair and yet they won't even tell us what the number is incredible okay but this is still a really cool achievement so let's break down the numerous disclaimers that go along with this 0 to 60 and talk about what the real 0 to 60 might be okay so here we have what is the equivalent of top gears cool wall except now we're looking at disclaimers for this car 0 to 60 some of those disclaimers are not cool some of them are very cool so we'll get into them uh and starting off with not cool there's really two big ones roll out and a prepped surface now I know some people are going to push back and say this is a drag car on a drag strip surely you know that's where roll out originates it makes sense to use roll out in this case now let's take a moment zero to 60s are not measured on drag strips they do not measure your 0 to 60 they measure your 60 foot but that is something different 0 to 60 is measured using a GPS and then what they do is they delete the first foot digitally they say here's what the actual 0 to 60 is then they delete that first foot and say here you go public you can believe this number that has you know 6 mph deleted from it uh it's crazy it makes no sense so that's disclaimer number one that isn't cool the second being a prep surface this is using glue it's on a drag strip you know it is a drag car so I kind of get it but when a car magazine when you open a car magazine and it says this car 0 to 60 is this it's on a road it's on a road surface right it's not using glue all the car magazines roll out and they don't believe you should be using glue for your numbers the only other car that's done it basically in recent history is Tesla with the Plaid uh wasn't cool so Motor Trend dided their own test and got the real numbers on a road without using glue so both of these not cool that they did it or at least didn't provide the real numbers so regarding real numbers let's look at how powerful roll out really is looking at some actual examples so these are some numbers from Motor Trend the Tesla p100d was able to accelerate rate to 5.9 mph in that 1T of roll out and it took 26 seconds La Ferrari rear wheeel drive so kind of similar to the case here which is interesting to see also 5.9 milph and it did it in just 019 seconds um so you know it's real 0 to 60 time you would add on 0.19 seconds to get that with the number that includes roll out okay so Tesla plaid 5.9 milph again so it's kind of cool to see that there's this speed that basically with 1T of acceleration on a tire uh you reach this maximum speed of about 5.9 mph uh and the Tesla plaid did that in 0.15 seconds so that was the roll out time that was deleted from its 0 to 60 so if we were to look at the Tesla plaid this is accelerating on average at about 1.8 GS the demon 170 is supposedly capable of 2gs so if you were to plug in accelerating from 0 to 5.9 mph at 2 G's that would give you just 0.13 seconds now my own time in the previous Dodge team in which was not good it wasn't that quick of a 0 to 60 uh but I accelerated in that first foot to 5.1 mph in 25 seconds so my roll out was 0.25 seconds when I tested this car uh several years ago so the actual 0 to 60 for the Dodge Demon on a prepped surface is going to lie somewhere between these two numbers being added so a 1.79 to a 1.91 second below 2 seconds which I mean this is you know extraordinary and I'm betting that it's closer to this number than it is to this number because this was in The Old Demon and it wasn't that great of a lunch so it's going to be a really good 0 to 60 on a prep surface and definitely below 2 seconds which is awesome to see so what else is cool about the demon well this is a genuine production car I think that's awesome there's going to be up to 30 3300 of these built so good numbers of them built and this is a car that costs $100,000 now yeah as the name implies there's probably going to be $170,000 markup but it's a $100,000 vehicle right this isn't just some extraordinary thing like you know the rimac Nea or the pen andrina Batista where it's multiple millions of dollars and then they say oh production car record it's like yeah kind of I guess but it's much cooler when it's something that's you know more within grasp of the public uh that isn't some insane number like you know $2 million $3 million and that you know they're actually making it in decent production numbers also is this the first car to break the 2cond barrier 0 to 60 it just may be now yes this was on a prep surface so that's the disclaimer that goes along with it but it did actually start at zero unlike a lot of those out there saying hey we have this 0 to 60 under 2 seconds and then they're not telling you that that doesn't include uh the roll out time so the reality is this is a car that has done it 0 to 60 and under 2 seconds also what's crazy about this is that the vehicle is rear wheeel drive this makes a launch so difficult to hit a really good 0 to 60 we'll get into that later the fact that this is 1,000 horsepower with a warranty that's incredibly cool it has cool features like the trans brake and power Chiller which I have videos on if you're curious about how those work okay now two more really cool disclaimers that go along with this 0 to 60 of the Dodge Demon first of all it's on drag radials and you might immediately be like that's cheating but it's not they're street legal they took drag radial they put some grooves in them so they could make them street legal they did the work they're bespoke to this vehicle uh and and of course they are critical for that 0 to 60 and that's how you're going to get that extra grip for the incredible launch uh but they did it they put street legal drag radials on a production car uh are they going to be great in the rain probably not are they going to wear really fast probably do you have to sign a waiver to use them apparently so Dodge tells me there's an agreement covering things like tires that buyers must sign uh so regardless like yeah it's it's an asteris that goes along with this 0 to 60 but they're street legal so in my opinion it works now does this mean everyone from now on is going to be offering an option for their cars to come with you know drag radials in order to hit that 060 I don't know maybe but regardless Dodge did I think it's cool also to run maximum power the engine needs to have E85 so ethanol uh for the fuel in order to reach that 1,25 horsepower it's less if you do not run on ethanol what's cool about this is that the system automatically detects what your fuel is the composition how much ethanol is within that and as long as the fuel is 65% or greater ethanol it will unlock full power and you can achieve uh these numbers you know with the given disclaimers and conditions provided here so it's a street legal fuel uh you know it's not as available as pump gas but I think regardless it's you know you can run on the street they got everything integrated so that you can run it without having to think twice about it I think both of these are very cool that they did it for this product okay something that's almost equally as important as tires in order for a rear wheeel drive vehicle to get a good launch is where its center of gravity is it is critically important so I'm going to explain why so if you're to look at a Dodge Demon and I'm taking these specs from the previous Dodge Demon which had a weight distribution of 58% on front 40 2% of the weight on the rear and you look at what is the maximum force that this rear tire can accelerate uh this vehicle with well that force is equal to the frictional coefficient of your tires multiplied by how much weight is on that tire okay so if you have a tire that's capable of accelerating at 1G well it has a frictional coefficient of one if you have a tire that has a frictional coefficient of two it's able to accelerate at 2 G's so in this case we know we're able to accelerate at 2 G's so we have our frictional coefficient of two now 42% of the weight of the vehicle is on that rear tire so the maximum acceleration we can have is84 G's based on the weight distribution of this vehicle now we know it can do better than 84 GS right that's not all that impressive so how do we improve that well the way you improve it is as you start accelerating you have load transfer to that rear wheel so as you start accelerating the center of gravity you can pretend that you basically have a force that's saying okay now we're resisting this motion and we're transferring load from the front end to the rear end and where you position that center of gravity is critical if you want to achieve the maximum acceleration so in the world of engineering uh there's this principle where if you sum the moments about a point it should equal zero on a free body diagram so if we're looking at all the forces on our car basically we have uh the weight of the car resting on the two tires and we want all of that weight to be on the back tire so we're going to eliminate this front and then we also have the force that the tire is trying to accelerate our vehicle with right it's trying to push the car that way so you have this force uh which the tires are providing that frictional coefficient times the normal force in other words 2 * n so 2 N multiplied by this distance Y and we have the force of the weight of the vehicle on that rear tire so we've got the road pushing up with the normal force one normal force multiplied by this distance X to sum our moments about the center of gravity we'll get to the point of all this if this seems confusing but if you write this out what you can basically find is you have normal force * x = 2 normal force * Y in other words x = 2 y so this distance here has to be twice this distance here to locate your center of gravity so your center of gravity must be located on this dotted line I've drawn right here in order to achieve maximum acceleration what if your center of gravity was up here well what that means is as you start accelerating the car would simply just flip backwards right it would reach it wouldn't be able to reach 2 GS before it just starts to flip back what if your center of gravity was down here in this region well then you would never be able to reach that 2 G's your your tires would start spinning before that happened because you don't have enough load transfer going back to that rear tire so it's critical that the center of gravity falls on this dotted line so when Dodge is designing it they have to make sure that it happens like that now you can have a little bit of a benefit from the Springs right so as the front end lifts up that means your center of gravity also lifts up which gives you a bit of a benefit and helps you achieve this even if your center of gravity were say just a little bit lower than this dotted line but the critical point is if you don't have your center of gravity high enough well then you just do you know you spin the tires before you can reach 2gs if you go above that if your CG is way too high the car just flips backwards that's not good right so it's it's really a delicate balance and it's a very cool thing to see that they're able to achieve this 2gs and have that you know just have the tires lift up and then go on down uh the drag strip okay so for a rear wheeel drive vehicle that has plenty of power there are two factors that are limiting your acceleration one is your tires and the other is the location of your center of gravity so this equation right here takes those two variables and allows you to Cal calate your maximum possible acceleration based on your tires and based on where your center of gravity is so if you plug in all the numbers for the Dodge Demon uh you get a maximum possible acceleration of two G's if you have a center of gravity height at about 85.5 mm now that's pretty high for example a Toyota Supra has a center of gravity height at about 500 mm um but you know part of this could be that that front end is going to raise up a bit before uh you know you get full load transfer to the rear and part of that is helped actually by the front damper so the front dampers have a setting when you're in drag mode they have soft rebound meaning allowing the vehicle to lift up to pull away from those dampers very easily so it's a quick transition and then everything else is stiff the rear is stiff uh and compression is stiff but it allows the the front of the car to lift up very easily which can help with raising that CG which can help with load transfer uh so the cool thing about about this equation is you can use it to calculate in the real world what's the maximum acceleration that this thing can actually achieve okay so here's the really cool part where we use math to predict real world numbers and this is going to illustrate why rear wheel drive is so challenging so on a prepped surface knowing that we have a maximum frictional coefficient of two the average acceleration of the demon down that 0 to 60 was 1.5 G's absolutely bomb ERS which gives it a 0 to 60 of 1.8 seconds on a prep surface which we had calculated earlier compare that to the Tesla Model S plaid uh which is at 2.13 seconds on a prepared surface so significantly quicker than the Plaid which is absolutely nuts however if we go to a road a public road you know a normal Road a drag strip that hasn't men prepped uh and let's give this uh demon the benefit of the doubt and say this is the highest frictional Co efficient of any tire out there that you can put on a production car at 1.5 the the real limit uh I believe today is somewhere around 1.4 uh but they have surpassed that with these drag radials so let's say it's 1.5 well that will give them because of the location of the center of gravity using this equation uh it will give them a maximum acceleration of about 1.1 G's meaning the real world using really nice tires but on you know non-prepared surface they're going to have a 0 to 60 of about 2.5 seconds versus Tesla plaid which we know has already done it in 2.3 seconds so the second you go out into the real world uh this is no longer the world's quickest production car it's only on that prepared surface with a certain set of circumstances which it can achieve that number now just for fun let's look at some other circumstances and no you shouldn't be driving your Dodge Demon in the rain or the snow right like it's designed for the drag strip but theoretically if you were to you know what are some of the numbers that you can expect so if you're driving in the rain and you have a frictional coefficient of8 the maximum acceleration that the Dodge Demon is going to be able to achieve is 44 G's giving it a 0 to 60 of 6.2 seconds compare that to the Tesla Model S plaid if you've got that frictional coefficient of8 it's going to be able to achieve a 0 to 60 and 3.4 seconds because it's all-wheel drive in the snow things get even worse so our maximum acceleration given a frictional coefficient of. 3 is now just going to be .14 G's and our 0 to 60 is 19.5 seconds versus the Tesla at 9.1 seconds so less than half so real world in basically every condition an all-wheel drive vehicle that has plenty of power is going to be quicker all right so quick summary on a prepared surface the 0 to 60 is somewhere around 1.8 seconds which is is absolutely nuts uh in the real world I doubt we're going to see a 0 to 60 better than 2.5 seconds uh and then the other thing is you know once again this car is incredibly cool you don't have to be misleading about it to explain how cool it is so my advice to dodge is simply let out the real numbers release the real numbers let a third party test this thing it'd be awesome if you did thank you all so much for watching and if you have any questions or comments feel free to leave them belowhello everyone and welcome the Dodge Demon 170 has numbers that are simply mindblowing over 1,000 horsepower accelerates at over 2 G's never done before in a production car it generates cylinder pressures equal to the weight of about 7 and 1 12 Dodge demons pressing down on a single piston the fuel injectors are capable of providing 164 gallons of fuel per hour for context that's more than four times the maximum fuel flow of a modern F1 engine which makes similar power so yeah okay surprise maybe the demon isn't fuel efficient but it throws down a 0 to 60 of 1.66 seconds a production car record and that's a number we can certainly trust right no of course not because as is increasingly common incredibly cool engineering must be viewed through the distorted lens of mislead marketing the 0 to 60 is with roll out and if you've watched this channel you know how dumb I think rollout is the industry practice of deleting the first foot of acceleration essentially it's starting the 0 to 60 clock after the car has reached about 6 m per hour you would probably call that a 6 to 60 rightly so but within the industry we'd call that a 0 to 60 with roll out and honestly most of the time we forget to say that last bit now I'm just some idiot on the internet right why should you listen to my opinion and truthfully you shouldn't my opinion doesn't matter don't listen to it but do listen to the opinion of the current CEO of Dodge and what he said about roll out back in 2017 as it related to the previous Dodge Demon quote rollouts aren't a fair way to do 0 to 60 honestly a real 0 to 60 is from a dead stop wait what so in 2017 Dodge cared about portraying their numbers in a fair way so when they gave the 0 to 60 of the 2018 demon at 2.3 seconds it was truly from zero no roll out nonsense but 6 years later you cannot even find the word roll out mentioned once on the public demon page or on the media page they admit it only when you ask and they won't provide the number without roll out the current CEO of Dodge has been quoted saying roll out isn't fair and yet they won't even tell us what the number is incredible okay but this is still a really cool achievement so let's break down the numerous disclaimers that go along with this 0 to 60 and talk about what the real 0 to 60 might be okay so here we have what is the equivalent of top gears cool wall except now we're looking at disclaimers for this car 0 to 60 some of those disclaimers are not cool some of them are very cool so we'll get into them uh and starting off with not cool there's really two big ones roll out and a prepped surface now I know some people are going to push back and say this is a drag car on a drag strip surely you know that's where roll out originates it makes sense to use roll out in this case now let's take a moment zero to 60s are not measured on drag strips they do not measure your 0 to 60 they measure your 60 foot but that is something different 0 to 60 is measured using a GPS and then what they do is they delete the first foot digitally they say here's what the actual 0 to 60 is then they delete that first foot and say here you go public you can believe this number that has you know 6 mph deleted from it uh it's crazy it makes no sense so that's disclaimer number one that isn't cool the second being a prep surface this is using glue it's on a drag strip you know it is a drag car so I kind of get it but when a car magazine when you open a car magazine and it says this car 0 to 60 is this it's on a road it's on a road surface right it's not using glue all the car magazines roll out and they don't believe you should be using glue for your numbers the only other car that's done it basically in recent history is Tesla with the Plaid uh wasn't cool so Motor Trend dided their own test and got the real numbers on a road without using glue so both of these not cool that they did it or at least didn't provide the real numbers so regarding real numbers let's look at how powerful roll out really is looking at some actual examples so these are some numbers from Motor Trend the Tesla p100d was able to accelerate rate to 5.9 mph in that 1T of roll out and it took 26 seconds La Ferrari rear wheeel drive so kind of similar to the case here which is interesting to see also 5.9 milph and it did it in just 019 seconds um so you know it's real 0 to 60 time you would add on 0.19 seconds to get that with the number that includes roll out okay so Tesla plaid 5.9 milph again so it's kind of cool to see that there's this speed that basically with 1T of acceleration on a tire uh you reach this maximum speed of about 5.9 mph uh and the Tesla plaid did that in 0.15 seconds so that was the roll out time that was deleted from its 0 to 60 so if we were to look at the Tesla plaid this is accelerating on average at about 1.8 GS the demon 170 is supposedly capable of 2gs so if you were to plug in accelerating from 0 to 5.9 mph at 2 G's that would give you just 0.13 seconds now my own time in the previous Dodge team in which was not good it wasn't that quick of a 0 to 60 uh but I accelerated in that first foot to 5.1 mph in 25 seconds so my roll out was 0.25 seconds when I tested this car uh several years ago so the actual 0 to 60 for the Dodge Demon on a prepped surface is going to lie somewhere between these two numbers being added so a 1.79 to a 1.91 second below 2 seconds which I mean this is you know extraordinary and I'm betting that it's closer to this number than it is to this number because this was in The Old Demon and it wasn't that great of a lunch so it's going to be a really good 0 to 60 on a prep surface and definitely below 2 seconds which is awesome to see so what else is cool about the demon well this is a genuine production car I think that's awesome there's going to be up to 30 3300 of these built so good numbers of them built and this is a car that costs $100,000 now yeah as the name implies there's probably going to be $170,000 markup but it's a $100,000 vehicle right this isn't just some extraordinary thing like you know the rimac Nea or the pen andrina Batista where it's multiple millions of dollars and then they say oh production car record it's like yeah kind of I guess but it's much cooler when it's something that's you know more within grasp of the public uh that isn't some insane number like you know $2 million $3 million and that you know they're actually making it in decent production numbers also is this the first car to break the 2cond barrier 0 to 60 it just may be now yes this was on a prep surface so that's the disclaimer that goes along with it but it did actually start at zero unlike a lot of those out there saying hey we have this 0 to 60 under 2 seconds and then they're not telling you that that doesn't include uh the roll out time so the reality is this is a car that has done it 0 to 60 and under 2 seconds also what's crazy about this is that the vehicle is rear wheeel drive this makes a launch so difficult to hit a really good 0 to 60 we'll get into that later the fact that this is 1,000 horsepower with a warranty that's incredibly cool it has cool features like the trans brake and power Chiller which I have videos on if you're curious about how those work okay now two more really cool disclaimers that go along with this 0 to 60 of the Dodge Demon first of all it's on drag radials and you might immediately be like that's cheating but it's not they're street legal they took drag radial they put some grooves in them so they could make them street legal they did the work they're bespoke to this vehicle uh and and of course they are critical for that 0 to 60 and that's how you're going to get that extra grip for the incredible launch uh but they did it they put street legal drag radials on a production car uh are they going to be great in the rain probably not are they going to wear really fast probably do you have to sign a waiver to use them apparently so Dodge tells me there's an agreement covering things like tires that buyers must sign uh so regardless like yeah it's it's an asteris that goes along with this 0 to 60 but they're street legal so in my opinion it works now does this mean everyone from now on is going to be offering an option for their cars to come with you know drag radials in order to hit that 060 I don't know maybe but regardless Dodge did I think it's cool also to run maximum power the engine needs to have E85 so ethanol uh for the fuel in order to reach that 1,25 horsepower it's less if you do not run on ethanol what's cool about this is that the system automatically detects what your fuel is the composition how much ethanol is within that and as long as the fuel is 65% or greater ethanol it will unlock full power and you can achieve uh these numbers you know with the given disclaimers and conditions provided here so it's a street legal fuel uh you know it's not as available as pump gas but I think regardless it's you know you can run on the street they got everything integrated so that you can run it without having to think twice about it I think both of these are very cool that they did it for this product okay something that's almost equally as important as tires in order for a rear wheeel drive vehicle to get a good launch is where its center of gravity is it is critically important so I'm going to explain why so if you're to look at a Dodge Demon and I'm taking these specs from the previous Dodge Demon which had a weight distribution of 58% on front 40 2% of the weight on the rear and you look at what is the maximum force that this rear tire can accelerate uh this vehicle with well that force is equal to the frictional coefficient of your tires multiplied by how much weight is on that tire okay so if you have a tire that's capable of accelerating at 1G well it has a frictional coefficient of one if you have a tire that has a frictional coefficient of two it's able to accelerate at 2 G's so in this case we know we're able to accelerate at 2 G's so we have our frictional coefficient of two now 42% of the weight of the vehicle is on that rear tire so the maximum acceleration we can have is84 G's based on the weight distribution of this vehicle now we know it can do better than 84 GS right that's not all that impressive so how do we improve that well the way you improve it is as you start accelerating you have load transfer to that rear wheel so as you start accelerating the center of gravity you can pretend that you basically have a force that's saying okay now we're resisting this motion and we're transferring load from the front end to the rear end and where you position that center of gravity is critical if you want to achieve the maximum acceleration so in the world of engineering uh there's this principle where if you sum the moments about a point it should equal zero on a free body diagram so if we're looking at all the forces on our car basically we have uh the weight of the car resting on the two tires and we want all of that weight to be on the back tire so we're going to eliminate this front and then we also have the force that the tire is trying to accelerate our vehicle with right it's trying to push the car that way so you have this force uh which the tires are providing that frictional coefficient times the normal force in other words 2 * n so 2 N multiplied by this distance Y and we have the force of the weight of the vehicle on that rear tire so we've got the road pushing up with the normal force one normal force multiplied by this distance X to sum our moments about the center of gravity we'll get to the point of all this if this seems confusing but if you write this out what you can basically find is you have normal force * x = 2 normal force * Y in other words x = 2 y so this distance here has to be twice this distance here to locate your center of gravity so your center of gravity must be located on this dotted line I've drawn right here in order to achieve maximum acceleration what if your center of gravity was up here well what that means is as you start accelerating the car would simply just flip backwards right it would reach it wouldn't be able to reach 2 GS before it just starts to flip back what if your center of gravity was down here in this region well then you would never be able to reach that 2 G's your your tires would start spinning before that happened because you don't have enough load transfer going back to that rear tire so it's critical that the center of gravity falls on this dotted line so when Dodge is designing it they have to make sure that it happens like that now you can have a little bit of a benefit from the Springs right so as the front end lifts up that means your center of gravity also lifts up which gives you a bit of a benefit and helps you achieve this even if your center of gravity were say just a little bit lower than this dotted line but the critical point is if you don't have your center of gravity high enough well then you just do you know you spin the tires before you can reach 2gs if you go above that if your CG is way too high the car just flips backwards that's not good right so it's it's really a delicate balance and it's a very cool thing to see that they're able to achieve this 2gs and have that you know just have the tires lift up and then go on down uh the drag strip okay so for a rear wheeel drive vehicle that has plenty of power there are two factors that are limiting your acceleration one is your tires and the other is the location of your center of gravity so this equation right here takes those two variables and allows you to Cal calate your maximum possible acceleration based on your tires and based on where your center of gravity is so if you plug in all the numbers for the Dodge Demon uh you get a maximum possible acceleration of two G's if you have a center of gravity height at about 85.5 mm now that's pretty high for example a Toyota Supra has a center of gravity height at about 500 mm um but you know part of this could be that that front end is going to raise up a bit before uh you know you get full load transfer to the rear and part of that is helped actually by the front damper so the front dampers have a setting when you're in drag mode they have soft rebound meaning allowing the vehicle to lift up to pull away from those dampers very easily so it's a quick transition and then everything else is stiff the rear is stiff uh and compression is stiff but it allows the the front of the car to lift up very easily which can help with raising that CG which can help with load transfer uh so the cool thing about about this equation is you can use it to calculate in the real world what's the maximum acceleration that this thing can actually achieve okay so here's the really cool part where we use math to predict real world numbers and this is going to illustrate why rear wheel drive is so challenging so on a prepped surface knowing that we have a maximum frictional coefficient of two the average acceleration of the demon down that 0 to 60 was 1.5 G's absolutely bomb ERS which gives it a 0 to 60 of 1.8 seconds on a prep surface which we had calculated earlier compare that to the Tesla Model S plaid uh which is at 2.13 seconds on a prepared surface so significantly quicker than the Plaid which is absolutely nuts however if we go to a road a public road you know a normal Road a drag strip that hasn't men prepped uh and let's give this uh demon the benefit of the doubt and say this is the highest frictional Co efficient of any tire out there that you can put on a production car at 1.5 the the real limit uh I believe today is somewhere around 1.4 uh but they have surpassed that with these drag radials so let's say it's 1.5 well that will give them because of the location of the center of gravity using this equation uh it will give them a maximum acceleration of about 1.1 G's meaning the real world using really nice tires but on you know non-prepared surface they're going to have a 0 to 60 of about 2.5 seconds versus Tesla plaid which we know has already done it in 2.3 seconds so the second you go out into the real world uh this is no longer the world's quickest production car it's only on that prepared surface with a certain set of circumstances which it can achieve that number now just for fun let's look at some other circumstances and no you shouldn't be driving your Dodge Demon in the rain or the snow right like it's designed for the drag strip but theoretically if you were to you know what are some of the numbers that you can expect so if you're driving in the rain and you have a frictional coefficient of8 the maximum acceleration that the Dodge Demon is going to be able to achieve is 44 G's giving it a 0 to 60 of 6.2 seconds compare that to the Tesla Model S plaid if you've got that frictional coefficient of8 it's going to be able to achieve a 0 to 60 and 3.4 seconds because it's all-wheel drive in the snow things get even worse so our maximum acceleration given a frictional coefficient of. 3 is now just going to be .14 G's and our 0 to 60 is 19.5 seconds versus the Tesla at 9.1 seconds so less than half so real world in basically every condition an all-wheel drive vehicle that has plenty of power is going to be quicker all right so quick summary on a prepared surface the 0 to 60 is somewhere around 1.8 seconds which is is absolutely nuts uh in the real world I doubt we're going to see a 0 to 60 better than 2.5 seconds uh and then the other thing is you know once again this car is incredibly cool you don't have to be misleading about it to explain how cool it is so my advice to dodge is simply let out the real numbers release the real numbers let a third party test this thing it'd be awesome if you did thank you all so much for watching and if you have any questions or comments feel free to leave them below\n"