Engine Braking (split from the VR-4 brake thread in FS/WTB)

[white_2kgt]

chad, you're gonna get rolled by something with half the power.

If that's the case then so be it. I don't mind following somebody that's faster than me, I get to learn something new

[Mike]

but you won't be able to follow

[white_2kgt]

but you won't be able to follow

you really should stop swinging off ryan's nuts, maybe when YOU catch me you can join in on the race smack talk

[Mike]

you smoke me on straights... congrats! a monkey could

[white_2kgt]

you smoke me on straights... congrats! a monkey could

don't forget the turns, I smoke you there as well

[Mike]

keep dreamin.

[white_2kgt]

keep dreamin.

ahhhhhhhahahahhhh

Bring It.

[.RJ]

I'm going to find a way to sneak out in group 3 at the next summit event

[Maengelito]

I'm going to find a way to sneak out in group 3 at the next summit event

i think that'll be the debut of the 240. i'll roll all of you with stock suspension, scotty's blingin' 17" wheels and i'll be d0r1fting the entire time with the driver's side door open and my ass hangin out the side.

[JohnC]

I'm going to find a way to sneak out in group 3 at the next summit event

I hear that cash bribes to grid officials go a long way...

[mpg9999]

Eh, since brakes don't stop your car, who cares? The energy it takes to slow the engine down is practically nothing compared to slowing your car down.

[.RJ]

I hear that cash bribes to grid officials go a long way...

I think I could arrange a few cold tallboys...

[BLINGMW]

Eh, since brakes don't stop your car, who cares? The energy it takes to slow the engine down is practically nothing compared to slowing your car down.

at first I thought, "duh", :roll: but actually that makes a lot of sense. As long as you're not overheating your brakes, and your tires are the limiting factor, then this might all be a moot point. I hadn't thought of it that way. :thumbup:

[mpg9999]

Eh, since brakes don't stop your car, who cares? The energy it takes to slow the engine down is practically nothing compared to slowing your car down.

at first I thought, "duh", :roll: but actually that makes a lot of sense. As long as you're not overheating your brakes, and your tires are the limiting factor, then this might all be a moot point. I hadn't thought of it that way. :thumbup:

Exactly, the most important thing is getting the rev matching down perfectly to not upset the tires. Even when its done really well I have locked up the tire momentarily. When I was looking through this thread that made me think about how bracking with the clutch in will affect the dynamic brake balance. Then I thought about how little kinetic energy there is from the rotating engine compared to that of the moving car, so it really wont have that much of an affect if rev matched properly.

[Evan]

rev to 7k and take your foot off the gas.
make sure your seatbelt is tight first.

you would be surprised how much energy and friction there is in a rotating engine spinning pretty high

[mpg9999]

rev to 7k and take your foot off the gas.
make sure your seatbelt is tight first.

you would be surprised how much energy and friction there is in a rotating engine spinning pretty high

Jack your car up so the drive wheels are off the ground. Rev to 7k with it in gear, then hit the brakes and see how it nearly instantaniously goes to zero. Feel the brakes, they will still be relativly cool. Do the same thing in you car while driving and the brakes will be much much hotter, Especially at very high speeds because the kinetic energy increases exponentially with speed.

Edit: That may not be so good for your car, so I'm not saying you should actually do it.

[Maengelito]

there's no question that brakes can stop a car faster than the engine can, but in a race environment, lifting will be more than enough to upset the car.

[Evan]

Jack your car up so the drive wheels are off the ground. Rev to 7k with it in gear, then hit the brakes and see how it nearly instantaniously goes to zero. Feel the brakes, they will still be relativly cool. Do the same thing in you car while driving and the brakes will be much much hotter, Especially at very high speeds because the kinetic energy increases exponentially with speed.

Edit: That may not be so good for your car, so I'm not saying you should actually do it.

thanks cap'n!
How does that back up your statement about a spinning engine not having enough force to slow a car? That has nothing to do with brakes. Im not arguing that braking wont slow a car down faster than engine braking, believe me, I know this quite well.

A spinning engine creates a lot of friction and forces that can slow a car.
you suggested otherwise, so i suggested a simple exercise. then you threw in something unrelated with brakes and jackstands or something. explain.

[mpg9999]

How does that back up your statement about a spinning engine not having enough force to slow a car? That has nothing to do with brakes. Im not arguing that braking wont slow a car down faster than engine braking, believe me, I know this quite well.

A spinning engine creates a lot of friction and forces that can slow a car.
you suggested otherwise, so i suggested a simple exercise. then you threw in something unrelated with brakes and jackstands or something. explain.

I never said the engine doesnt have enough force to slow the car. My point is 1) Tires stop your car, so why does it matter? and 2) that one may bring up the point that using the engine could help reduce (or from what I get from what was posted earlier, increase) the amount of work the brakes have to do, and that really doesnt matter because the amount of kinetic energy the engine has is a fraction of a percent of what a fast moving car has.


That is unless I'm talking out of my ass again, which I sometimes do

[Mike]

but it is still additional energy that the brakes must stop. while tires ARE the limiting factor on the first stop or two, they might not be on the 20th.