I think you can use the aspect of kinetic energy. For an object to achieve certain velocity, that object has to be given some kinetic energy. An engine with more horsepower, meaning it can give vehicle more kinetic energy in SHORTER time, hence more horsepower=quicker acceleration.
Good work. Now you can use these equations along with the torque curve and plot every gear in acceleration vs vehicle speed. This will show why a flat torque curve is so important.
I tried these calculations for my 2012 Focus 5MT. I could only find torque values at 4450 and 6500 RPM (146 & 129 lb-ft), so I used the average of those two data points. Assuming I take 0.5 seconds to shift, I calculated 6.4 second 0-60mph. Car and Driver tested it at 7.3 seconds. Pretty cool math!
The feeling of getting pushed back to your seat during acceleration is caused by Newton's first law of motion, which is Inertia. You (the guy in the car) and the car are two seperate entities. When the car accelerates, you technically stay at rest while the car moves forward. The car will then "push" you so that you will be at the same speed as the it. You're not actually getting pushed against the car, rather the car itself pushes into you so that your body accelerates from rest to the speed that matches the car's current speed.
The two come as a pair. But ultimately the force at the tires comes from a torque at the crank. Typically if you increase one, the other will increase as well. You may wish to check out my video "hp vs torque" if you haven't already.
Wanted to say thanks for the videos, very enlightening and educational. I homeschool my 14 y/o sons and use your vids sometime to review concepts we've covered in geometry, physics and algebra. They can see direct applications and implement the concepts on our '68 Porsche+STi engine swap. Keep up the great work!
Yes, though including downforce, and much stickier tires such as those used in NHRA drag cars, you can get up to 4-5 g's of acceleration. They post 60's under a second easily.
I have been looking everywhere for this exact formula and I can't believe it was one of your first videos. I have watched every video you have ever uploaded and must have forgotten you did this. I have been working on a game/application to plug in vehicle weight, HP, gear ratios, drag, etc.. and then show an animation of your car realistically accelerating and giving you acceleration times and top speed. Then you can go back and tweak some things and see how it effects the results.
Yep that's a common misconception about needing backpressure. It's is perceived that way only on modern engines, because the ECU needs to be re-programmed to 'see' the difference. Once you do that, you'll see the gain of going to straight pipes. p.s thanks for all the informative vids!
Yes, it's the basic principle of how dynos work actually, by accelerating a drum and seeing how long it takes, then back calculating the torque applied.
The soft is just a vehicle dynamics tester, I just took your data in the video to feed the software and see if I could get the 1.3s. Would be awesome if you could make a Part 2 of this video trying to reach a more approximated value. Keep on the good work bro!. Thanks for the vid!.
Thanks for making this! I was always interested in this, and had a rough idea, but you've made it much clearer and ironed out a few mistakes/oversights I had imagined! Thanks!
Because it's very simple to have a high torque value with gearing, where as gearing will not affect the horsepower. The torque at the wheels could be a bit deceiving when you simply have to change gears at 10 mph because the gear is maxed out.
No idea, as I know nothing of the software. That said, if it takes into consideration other factors (friction, air resistance, altering torque curve, etc.) it could be more accurate.My video has several basic assumptions (so that the principles can be understood) which could make the conclusion unrealistic.
Hey, i love your videos! How you explain everything. Simple and very easy to understand! Im right now really into automobile mechanics. Its very interesting and i just love it! Plan to keep studying it. But hey, a good suggestion for a new video would be on steering wheel. How does it work? What types of it are there? You should do a video of that. :D
The units here are figures. The concept is much more important. I don't care if you wrote the units in French, as long as I know which are greater, I would understand this video. Thanks for taking the time out of your day to do this.
I know, I know, you're upset I used those darn American units. Hear me out - when I made the two separate videos for my video on weight differences, the 'Murica units received 4 times the views. I understand that the units make no sense, but converting really isn't that difficult. All of the equations are labeled without units. You use the metric system, so I know you're smart and capable of the quick conversion! :)
Well technically you have to include weight distribution, and weight transfer, which I have not yet covered. So the real answer is yes, but just from a basic point of view (like this video) I did not consider weight distribution/transfer.
Hahaha, not quite! Perhaps I can do an update at some point on what I do. I work with forklifts, which do have many of the same systems. They're just much heavier, and can pick things up.
Engines don't need back pressure, they need the exhaust gases to have some velocity. Search my channel for "exhaust increase horsepower" I've got a video explaining further.
That g-force is created by the torque of a heavy flywheel which pushes us back in the seat. We Americans and the Germans call THAT power It is actually a torsional momentum. Racers use high revs to get power which better controls sliding wheels or those that spin. I enjoy Gwrman style torque spinning wheels at 40 mpg
Hey bud! Two Video ideas. 1. Obviously we know dyno will read drastically different depending on brand, location, and environment variables. I know many people say you can accurately measure real hp by a cars et or trap speed calculated against its weight. Nobody has been able to accurately explain the math on this. There are variables on changing gearing to accelerate faster would change your hp calculation.. but there MUST be a way to calculate this. Second. I think motor trend did a video back in the day but I can’t find it.. explaining why in a standing mile.. starting from a stand still vs starting at 60mph, or any speed for that matter,... your end speed really doesn’t change. I’ve seen this at the track with roll race events vs dig races. My et is obviously faster but my trap speed maybe increases by 1mph. Doesn’t matter if I’m doing 20...60..80... or whatever to start. I think the first idea would be awesome for helping people figure out a more accurate way to compare friends actual hp numbers.. would be cool. Thanks bud!
You can't choose between horsepower and torque, you can choose between torque and red line. So if you want more horsepower, you have to increase one or the other. But increasing the red line is only worth doing up to a point, so you're best to increase torque by for example - adding a turbo charger.
The torque is not really decreased, it's "moved" up in the revs range. That means the engine is more likely to stall on low RPM, but the engine will rev higher. Power is the product of torque times revs, so increasing revs increases power for the same torque.
The 0.7g is obviously assuming no losses. Ive tried these calculations for a few cars and they always give really high acceleration, ive even taken into account rolling res and drag What other losses would need to be considered to give a more realistic value? Drag, drive train loss, rolling resistance...anything else?
well just saying that for people who doesn't know whether to choose for a engine with more torque or horsepower when buying a vehicle. I think EngineeringExplained (Jason) has a video of explaining HP & Torque
Assuming constant acceleration no matter the speed seems A LOT simplified. The effect of 0,7g at 60mph (sorry about using metrics and rounded estimates) would be: F=m*a=3000kg*0,7*9,81m/s^2=20601N P=F*V=20601N*(100kmph/3,6)=572kW Or about 780Hp Your car just got a lot more powerful during the race
If you think about the equation which you can construct a power curve, the equations already exist. You can plot the results for every step in some software like matlab, or even excel,and get the shape of the power curve, then you can easily get shape of torque curve also.
I know that most of views are 'Americans' so...I will bear it as long as I can still understand the concept. Luckily, I'm in engineering school so it's quite okay for me.(C'mon people, everything in metric is way easier since, for example, meter grows 10 times each step not 12 inch,3 feet and something thousands yards, or some strange number for other units, just sayin' ) I know it's hard to make 2 versions for every single topic. Thanks for another awesome video.!!! ^__^
In practice the internal combustion engine won’t have a flat torque curve. Torque at the beginning will be 0. The formula here would be closer to an electric car. The internal combustion engine is more difficult to model.
Simple maths :) 60 mph = 27 m / s. tire grip = 1.2 => 1.2G max acceleration possible from tire = 11.76 m/s^2. 0-60 best time : t = v / a = 27 / 11.76 = 2.3 seconds. With perfect launch and grippy tire, no car can go under 2.3 seconds in a 0-60mph, no matter how powerful. Tire grip also affected by weight transfer. The harder you accelerate, the more weight on the back tires, the more grip, so theoretically you could go lower. I think the maths are correct ;)
to put it in a simple way for people who cannot decide to go for more horsepower or torque. Horsepower is better and more suitable for light vehicles and Torque is for heavy vehicles like HD pickup trucks especially for heavy hauling
I think from a standing start at idle speed acceleration is rooted in TORQUE. If an engine has enough TORQUE it needs NO series of gears in a transmission to begin forward movement and accelerate up to top speed. It just needs Park, Forward and Reverse. IF your engine has the space to lengthen the stroke, and increase the bore diameter of the pistons, but you want to do ONLY one or the other, I think increasing the bore diameter is the better way to raise your TORQUE number. Am I right about these things?
Due to contact with ground. The larger wheel has more traction due to increased contact area to ground. You can't put power down without traction hence the larger wheels on sports cars.
So shorter gears are better as long as you can keep a higher average horsepower and dont lose too much time shifting? Btw could you go over stuffs like powershifting, revmatching, double clutching etc. I find many people will find those techniques interesting. Thanks for a great channel as always. /swede
of course it is the power that accelerates; What fascinates me right now is how the torque which pushes me back against the seat makes me feel that I'm accelerating faster. Is the initial rate of acceleration faster with high torque? It sure is a big reason why Americans love the high torque muscle cars ....any ideas?
hi, its my dream to become a mechanical engineer and work with cars, so i was wondering where you go/went to school cause you seem very smart with cars!
Awesome vid dude, just a question, I used a software called nxgtr sim to test the learned theory, but I got massive different results, that same setup gives me ~2.25s in the 0-20mph, that's over 73% error-difference (seems too much), I may say for sure one of those results is wrong, any thoughts?
If you say max power is produced at 5252 rpm...which would be 9549 rpm if you calculate in metric units...then why do different vehicles have peak power at different rpms ??
@pap lazaru, your number represents an upper bound on acceleration with weight transfer already all the way back. Most cars won't have the traction do a full on wheel stand (which is where you are at if you get 100% weight on the rears) so they can't even reach that let alone better. Having said that, the coefficient of friction in pneumatic tyres is an odd thing, and under the right conditions can definitely exceed 1.2G (e.g. warm drag slicks on tarmac).
well, how you can figure out the average torque is by taking the integral (area under the line) of the hp curve divided by your rpm range. so if at 20mph (32km/h) you're at 5200rpm, take the integral up to that point, divide it by 5200 and that's the average torque your going to be working with. of course, its not going to be easy to figure out the integral because its not really a recognisable function, but you should be able to approximate it using a quadratic function
Wait a minute, this is conceptually blowing my mind now ... torque = F*r, so technically having a larger diameter wheel increases your wheel torque, but it has no effect on your acceleration. But in the formula torque/r = F = m*a we are using engine torque and wheel radius, so doesn't this imply that increasing your wheel radius (while holding engine torque constant because obviously we can't affect this by just making the wheels bigger) decreases your acceleration?? I love this stuff but I always confuse myself with it lol
Torque is translated from the shaft that is connected to the wheels to the wheels. Increasing wheel size simply means that wheels will push back the ground with lesser force. This will decrease the cars accelaration. Also bigger wheels have higher Moment of Inertia so engine will have hard time setting them in motion than smaller whees.
Imagine a planetary gearing. The sun gear, the planet gear carrier(not the planet gears) and the ring gear turn around the same axis. The planet carrier is driven by the engine/gearbox. The torque that drives the planet carrier is transferred to both the sun gear (to the front axle) and ring gear (to the rear axle). The force is transferred by the teeth of the gears, but because sun and ring gear teeth have different radii from the axis, torques are split unevenly between front and rear drive.
![[LIVE] : ONE ลุมพินี 88 | คู่เอก "ป้อมเพชร vs อัสลามจอน"](http://i.ytimg.com/vi/1ZqTVVbMgbo/mqdefault.jpg)
Yeah I was getting a bit of a cold when I filmed this. I'm good now haha
Can i use this for finding acceleration of electric car?
Just looking at all those imperial units and arbitrary conversions makes me cringe. But the information is solid! Thanks! :D
I think you can use the aspect of kinetic energy. For an object to achieve certain velocity, that object has to be given some kinetic energy. An engine with more horsepower, meaning it can give vehicle more kinetic energy in SHORTER time, hence more horsepower=quicker acceleration.
hp can put energy into anything regardless of short of long term
Good work. Now you can use these equations along with the torque curve and plot every gear in acceleration vs vehicle speed. This will show why a flat torque curve is so important.
I tried these calculations for my 2012 Focus 5MT. I could only find torque values at 4450 and 6500 RPM (146 & 129 lb-ft), so I used the average of those two data points. Assuming I take 0.5 seconds to shift, I calculated 6.4 second 0-60mph. Car and Driver tested it at 7.3 seconds. Pretty cool math!
The feeling of getting pushed back to your seat during acceleration is caused by Newton's first law of motion, which is Inertia. You (the guy in the car) and the car are two seperate entities. When the car accelerates, you technically stay at rest while the car moves forward. The car will then "push" you so that you will be at the same speed as the it. You're not actually getting pushed against the car, rather the car itself pushes into you so that your body accelerates from rest to the speed that matches the car's current speed.
The two come as a pair. But ultimately the force at the tires comes from a torque at the crank. Typically if you increase one, the other will increase as well. You may wish to check out my video "hp vs torque" if you haven't already.
Wanted to say thanks for the videos, very enlightening and educational. I homeschool my 14 y/o sons and use your vids sometime to review concepts we've covered in geometry, physics and algebra. They can see direct applications and implement the concepts on our '68 Porsche+STi engine swap. Keep up the great work!
Some recognition of the 'Metric' system would be beneficial!
im trying to do my homework here...but im learning so much!...must...stop..watching
Either way you're learning, good for you!
Me too, I can't stop blowing off my homework to learn something I'm actually interested in.
Yes, though including downforce, and much stickier tires such as those used in NHRA drag cars, you can get up to 4-5 g's of acceleration. They post 60's under a second easily.
I have been looking everywhere for this exact formula and I can't believe it was one of your first videos. I have watched every video you have ever uploaded and must have forgotten you did this. I have been working on a game/application to plug in vehicle weight, HP, gear ratios, drag, etc.. and then show an animation of your car realistically accelerating and giving you acceleration times and top speed. Then you can go back and tweak some things and see how it effects the results.
Yep that's a common misconception about needing backpressure. It's is perceived that way only on modern engines, because the ECU needs to be re-programmed to 'see' the difference. Once you do that, you'll see the gain of going to straight pipes. p.s thanks for all the informative vids!
Yes, it's the basic principle of how dynos work actually, by accelerating a drum and seeing how long it takes, then back calculating the torque applied.
The soft is just a vehicle dynamics tester, I just took your data in the video to feed the software and see if I could get the 1.3s. Would be awesome if you could make a Part 2 of this video trying to reach a more approximated value. Keep on the good work bro!. Thanks for the vid!.
Thanks for making this! I was always interested in this, and had a rough idea, but you've made it much clearer and ironed out a few mistakes/oversights I had imagined! Thanks!
Yeah as long as you can get up to the speeds you want, short gears are fine. And yes, those are topics I should eventually cover.
But how many elbows per lunar G does it take to reach 500 frog jumps???
+Sanjuro Makabe 42
Spoke too soon, you've got it on your channel. Awesome!
Because it's very simple to have a high torque value with gearing, where as gearing will not affect the horsepower. The torque at the wheels could be a bit deceiving when you simply have to change gears at 10 mph because the gear is maxed out.
No idea, as I know nothing of the software. That said, if it takes into consideration other factors (friction, air resistance, altering torque curve, etc.) it could be more accurate.My video has several basic assumptions (so that the principles can be understood) which could make the conclusion unrealistic.
Yes, all I would add is the obvious statement that HP is calculated by measuring torque and RPM, not the other way around.
Hey, i love your videos! How you explain everything. Simple and very easy to understand! Im right now really into automobile mechanics. Its very interesting and i just love it! Plan to keep studying it. But hey, a good suggestion for a new video would be on steering wheel. How does it work? What types of it are there? You should do a video of that. :D
The units here are figures. The concept is much more important. I don't care if you wrote the units in French, as long as I know which are greater, I would understand this video. Thanks for taking the time out of your day to do this.
No worries!
I know, I know, you're upset I used those darn American units. Hear me out - when I made the two separate videos for my video on weight differences, the 'Murica units received 4 times the views. I understand that the units make no sense, but converting really isn't that difficult. All of the equations are labeled without units. You use the metric system, so I know you're smart and capable of the quick conversion! :)
Of course - one step at a time for understanding it though.
Could be almost anything. You can probably find a torque curve for your car simply by googling it, or at least get the max torque number.
Well technically you have to include weight distribution, and weight transfer, which I have not yet covered. So the real answer is yes, but just from a basic point of view (like this video) I did not consider weight distribution/transfer.
Hahaha, not quite! Perhaps I can do an update at some point on what I do. I work with forklifts, which do have many of the same systems. They're just much heavier, and can pick things up.
Engines don't need back pressure, they need the exhaust gases to have some velocity. Search my channel for "exhaust increase horsepower" I've got a video explaining further.
That g-force is created by the torque of a heavy flywheel which pushes us back in the seat. We Americans and the Germans call THAT power It is actually a torsional momentum. Racers use high revs to get power which better controls sliding wheels or those that spin. I enjoy Gwrman style torque spinning wheels at 40 mpg
come on ofsoudminds
please help me out here and answer the questions so that I will not go about the rest of my life being misinformed
That is awesome! And very cool swap, do you by any chance have any videos or pictures of this? Would love to see it.
Love the video , really surprised how much I forgot at college. Would you ever write a book to put all this information in ?
Hey bud! Two Video ideas.
1. Obviously we know dyno will read drastically different depending on brand, location, and environment variables. I know many people say you can accurately measure real hp by a cars et or trap speed calculated against its weight. Nobody has been able to accurately explain the math on this. There are variables on changing gearing to accelerate faster would change your hp calculation.. but there MUST be a way to calculate this.
Second. I think motor trend did a video back in the day but I can’t find it.. explaining why in a standing mile.. starting from a stand still vs starting at 60mph, or any speed for that matter,... your end speed really doesn’t change. I’ve seen this at the track with roll race events vs dig races. My et is obviously faster but my trap speed maybe increases by 1mph. Doesn’t matter if I’m doing 20...60..80... or whatever to start.
I think the first idea would be awesome for helping people figure out a more accurate way to compare friends actual hp numbers.. would be cool. Thanks bud!
Not really. But if someone has your same car with a dyno chart online that's a good place to start.
Interesting topic, maybe one day!
You came a long way ❤❤
You can't choose between horsepower and torque, you can choose between torque and red line. So if you want more horsepower, you have to increase one or the other. But increasing the red line is only worth doing up to a point, so you're best to increase torque by for example - adding a turbo charger.
Your videos are great, keep up the good work!
Not forgetting the maximum grip you can get from the tire and road surface, which will limit the acceleration.
The torque is not really decreased, it's "moved" up in the revs range. That means the engine is more likely to stall on low RPM, but the engine will rev higher. Power is the product of torque times revs, so increasing revs increases power for the same torque.
Thanks for understanding! What engineering are you going to school for?
Use 202 since you know that's what it produces.
That's such a badass engine swap! both engine and car!
At the wheels, or theoretically at the engine with no losses.
Thanks!
The 0.7g is obviously assuming no losses.
Ive tried these calculations for a few cars and they always give really high acceleration, ive even taken into account rolling res and drag
What other losses would need to be considered to give a more realistic value?
Drag, drive train loss, rolling resistance...anything else?
Challenge complete. That's the playlist I'm working on now haha. Check it out on my channel page "How to increase horsepower"
well just saying that for people who doesn't know whether to choose for a engine with more torque or horsepower when buying a vehicle. I think EngineeringExplained (Jason) has a video of explaining HP & Torque
holy moly! you look a little different lol! thanks for making all of the super informational videos!
Thanks, I would love to meet your engineers! I'll definitely check out the channel, feel free to PM if you would like to collaborate on anything!
Yes, measure the tire not the wheel.
Nope, but I may eventually.
Assuming constant acceleration no matter the speed seems A LOT simplified. The effect of 0,7g at 60mph (sorry about using metrics and rounded estimates) would be:
F=m*a=3000kg*0,7*9,81m/s^2=20601N
P=F*V=20601N*(100kmph/3,6)=572kW
Or about 780Hp
Your car just got a lot more powerful during the race
Bro that's the acceleration at 1st gear....
If you think about the equation which you can construct a power curve, the equations already exist. You can plot the results for every step in some software like matlab, or even excel,and get the shape of the power curve, then you can easily get shape of torque curve also.
"the most powerful diesel... 218 hp" That's not a very powerful diesel...
Thank you, this was very helpful👍
I know that most of views are 'Americans' so...I will bear it as long as I can still understand the concept. Luckily, I'm in engineering school so it's quite okay for me.(C'mon people, everything in metric is way easier since, for example, meter grows 10 times each step not 12 inch,3 feet and something thousands yards, or some strange number for other units, just sayin' )
I know it's hard to make 2 versions for every single topic.
Thanks for another awesome video.!!! ^__^
Well Washington is only 10 minutes away... and legal. But I don't smoke haha - my lungs prefer health.
In practice the internal combustion engine won’t have a flat torque curve. Torque at the beginning will be 0. The formula here would be closer to an electric car. The internal combustion engine is more difficult to model.
Simple maths :)
60 mph = 27 m / s.
tire grip = 1.2 => 1.2G max acceleration possible from tire = 11.76 m/s^2.
0-60 best time : t = v / a = 27 / 11.76 = 2.3 seconds.
With perfect launch and grippy tire, no car can go under 2.3 seconds in a 0-60mph, no matter how powerful.
Tire grip also affected by weight transfer. The harder you accelerate, the more weight on the back tires, the more grip, so theoretically you could go lower.
I think the maths are correct ;)
Ohh gotcha
to put it in a simple way for people who cannot decide to go for more horsepower or torque. Horsepower is better and more suitable for light vehicles and Torque is for heavy vehicles like HD pickup trucks especially for heavy hauling
The sum of our weight is greater than the sum of your weight (in pounds, of course), hence this video.
That's about the same as my Integra (which is a bit slow).
Nice video, thanks for making it
I think from a standing start at idle speed acceleration is rooted in TORQUE. If an engine has enough TORQUE it needs NO series of gears in a transmission to begin forward movement and accelerate up to top speed. It just needs Park, Forward and Reverse. IF your engine has the space to lengthen the stroke, and increase the bore diameter of the pistons, but you want to do ONLY one or the other, I think increasing the bore diameter is the better way to raise your TORQUE number. Am I right about these things?
could you make a video showing how straight pipes can lead to loss of horsepower? or basically' how engines need some back pressure. thanks
I do '0-60' (0-100km/h here in Aus) in my GSR evo 3, red line at 7,500 :P and 15 pound of boost from 5,000 onwards
So if you have bigger wheels the force decreases (F= torque/D) and that means a lower acceleration?
Yep
So why do sports car usually have big wheels? (Besides the fact that they look cool)
Due to contact with ground. The larger wheel has more traction due to increased contact area to ground. You can't put power down without traction hence the larger wheels on sports cars.
bezaldo7 Having a larger wheel doesn't increase traction or increase the contact patch. Having a wider wheel does.
@@LeoLeanty The major reason for using a bigger wheel is that you can fit bigger brakes on the car and you cool them down more easily.
So shorter gears are better as long as you can keep a higher average horsepower and dont lose too much time shifting? Btw could you go over stuffs like powershifting, revmatching, double clutching etc. I find many people will find those techniques interesting. Thanks for a great channel as always. /swede
Kw delivery per second on the wheels and on the crank, that's what you need to know.
This young man has some youtube potential.
of course it is the power that accelerates; What fascinates me right now is how the torque which pushes me back against the seat makes me feel that I'm accelerating faster. Is the initial rate of acceleration faster with high torque? It sure is a big reason why Americans love the high torque muscle cars ....any ideas?
Ohh I don't know, it's a truck I suppose. I made it high so the acceleration numbers wouldn't seem so ridiculous.
Could you do a video about the braking system and the steering too?
hi, its my dream to become a mechanical engineer and work with cars, so i was wondering where you go/went to school cause you seem very smart with cars!
Not just the steering wheel but everything inside the car that makes the wheels move and stuff.
Freakin' love these videos!
I was expecting 300lb ft torque in both case, and only the peak HP to be changed. Am I wrong?
Check out my video "how exhaust systems can increase horsepower"
Awesome vid dude, just a question, I used a software called nxgtr sim to test the learned theory, but I got massive different results, that same setup gives me ~2.25s in the 0-20mph, that's over 73% error-difference (seems too much), I may say for sure one of those results is wrong, any thoughts?
As do many Americans. :)
If you say max power is produced at 5252 rpm...which would be 9549 rpm if you calculate in metric units...then why do different vehicles have peak power at different rpms ??
I know this video is 10 years old, but what if the car reaches 60 in third gear? How would the final equation change then?
I have videos on both topics, just try searching my channel! :)
Could you do a Video on the true Liters of a Rotary? There is Major speculation on what it is.
@pap lazaru, your number represents an upper bound on acceleration with weight transfer already all the way back. Most cars won't have the traction do a full on wheel stand (which is where you are at if you get 100% weight on the rears) so they can't even reach that let alone better. Having said that, the coefficient of friction in pneumatic tyres is an odd thing, and under the right conditions can definitely exceed 1.2G (e.g. warm drag slicks on tarmac).
I like your videos. Do you take requests? I have a specific horsepower related question that I am curious about but can't figure out myself.
Zack Hyde You can always ask here, if I can't answer someone else may!
Cmon ask
Never thought I’d learn horsepower to acceleration ratio from shaggy
well, how you can figure out the average torque is by taking the integral (area under the line) of the hp curve divided by your rpm range. so if at 20mph (32km/h) you're at 5200rpm, take the integral up to that point, divide it by 5200 and that's the average torque your going to be working with. of course, its not going to be easy to figure out the integral because its not really a recognisable function, but you should be able to approximate it using a quadratic function
yes!
You need to factor in wind resistance as well
George Harrison knows so much about cars!
I’m so lost but I like this video
So an electric engine car with constant TQ would be more accurate for this scenario?
Wait a minute, this is conceptually blowing my mind now ... torque = F*r, so technically having a larger diameter wheel increases your wheel torque, but it has no effect on your acceleration. But in the formula torque/r = F = m*a we are using engine torque and wheel radius, so doesn't this imply that increasing your wheel radius (while holding engine torque constant because obviously we can't affect this by just making the wheels bigger) decreases your acceleration??
I love this stuff but I always confuse myself with it lol
Torque is translated from the shaft that is connected to the wheels to the wheels. Increasing wheel size simply means that wheels will push back the ground with lesser force. This will decrease the cars accelaration. Also bigger wheels have higher Moment of Inertia so engine will have hard time setting them in motion than smaller whees.
Imagine a planetary gearing.
The sun gear, the planet gear carrier(not the planet gears) and the ring gear turn around the same axis.
The planet carrier is driven by the engine/gearbox. The torque that drives the planet carrier is transferred to both the sun gear (to the front axle) and ring gear (to the rear axle). The force is transferred by the teeth of the gears, but because sun and ring gear teeth have different radii from the axis, torques are split unevenly between front and rear drive.
Raymond C the car with 400lb/ft would accelerate faster but yes they would have the same top speed.... More HP is needed to increase top speed
So all you did was assume a higher value of torque and redo the calculations. Where is the actual correlation between power and acceleration?