Tip for the day by pacroozer

GSR · Post by **GSR** » Sat Jan 20, 2007 12:54 am

Developing a perfect launch 101

REmember that the gas pedal is long unlike the clutch pedal.

if you press on the gas with your whole foot you lose range of motion.

however, if you press on the very bottom of the pedal with your toe you have that extra space in between the pedal and the floor to work your see saw with, unlike how you would if you pressed on the top half. This is also crucial for shifting without slip, and for downshifting without slip.

GSR · Post by **GSR** » Sat Jan 20, 2007 12:59 am

but you guys wouldn't know about this would you. considering that you use the engine to limit slip.

Nervous · Post by **Nervous** » Sat Jan 20, 2007 1:14 am

GSR wrote:but you guys wouldn't know about this would you. considering that you use the engine to limit slip.

I agree with your first post, that's how I do it. Even though it's impossible to NOT get slip, even though it maybe for for like 2 seconds.

But this quote^ I don't understand.

GSR · Post by **GSR** » Sat Jan 20, 2007 2:33 am

my argument is that its better to slip while the gas is falling. as opposed to slipping while the gas is revved. doesn't make sense to me to rev match a downshift.

eaglecatcher · Post by **eaglecatcher** » Sat Jan 20, 2007 3:20 am

GSR wrote:my argument is that its better to slip while the gas is falling. as opposed to slipping while the gas is revved. doesn't make sense to me to rev match a downshift.

Ok, rev matches are smoother and less wear, especially at high revs.

You want to downshift from 4th at 2000 rpm, to 2nd at 3200rpm. With a no-gas, you are using the clutch to raise the rpm, and therefore, you are slipping it to smooth it out, or if you drop the clutch, it will jerk the drivetrain, and wear that out.

With a rev matched downshift, take the same scenario, but, instead of using the clutch to raise the rpm, us the gas pedal, blip the gas, and then as you are ready to let the clutch out, you can let it out very fast, because the engine is spinning at the right speed for the next gear.

If you don't understand that, then I don't know if you should even drive a stick.

StrangeWill · Post by **StrangeWill** » Sat Jan 20, 2007 4:51 am

GSR wrote:my argument is that its better to slip while the gas is falling. as opposed to slipping while the gas is revved. doesn't make sense to me to rev match a downshift.

Though of course:

If I can launch in 1 second at 2500 RPM, and it takes 2.5 seconds to launch at 1250 RPM, technically it's better to rev (it IS less wear).

Just an example, I don't have a tach installed right now, so I can't tell my revs...

magnus_1986 · Post by **magnus_1986** » Sat Jan 20, 2007 5:07 am

It MAY be less wear on the clutch but it increases the wear on the drive train exponentially

Hatchman · Post by **Hatchman** » Sat Jan 20, 2007 7:01 am

GSR wrote:my argument is that its better to slip while the gas is falling. as opposed to slipping while the gas is revved. doesn't make sense to me to rev match a downshift.

When you rev-match, the gas is falling as you release the cutch through the FP. You've blipped and completely let go of the gas when you rev-match.

Post by **jomotopia** » Sat Jan 20, 2007 10:05 am

Hatchman wrote:
GSR wrote:my argument is that its better to slip while the gas is falling. as opposed to slipping while the gas is revved. doesn't make sense to me to rev match a downshift.
When you rev-match, the gas is falling as you release the cutch through the FP. You've blipped and completely let go of the gas when you rev-match.

exactly, thank you mikey.

now everybody stop feeding the troll.

Sisrahtac · Post by **Sisrahtac** » Sat Jan 20, 2007 12:36 pm

Sypher · Post by **Sypher** » Sat Jan 20, 2007 1:54 pm

I vote that all future posts made by GSR/Pacroozer be monitored and approved by a mod or admin before it is allowed for general public viewing....

acadien · Post by **acadien** » Sat Jan 20, 2007 3:10 pm

No, I can't approve censure like that, let him say what he wants, we can always reply.

Hatchman · Post by **Hatchman** » Sat Jan 20, 2007 6:19 pm

acadien wrote:No, I can't approve censure like that, let him say what he wants, we can always reply.

And/or ignore.

Plus, John's keeping an eye on things. He aint afraid to use the D button

Sypher · Post by **Sypher** » Sat Jan 20, 2007 6:33 pm

lol I dont mind cencorship if it's placed on someone who deserves it

snikro · Post by **snikro** » Sat Jan 20, 2007 7:33 pm

StrangeWill wrote:
GSR wrote:my argument is that its better to slip while the gas is falling. as opposed to slipping while the gas is revved. doesn't make sense to me to rev match a downshift.
Though of course:

If I can launch in 1 second at 2500 RPM, and it takes 2.5 seconds to launch at 1250 RPM, technically it's better to rev (it IS less wear).

Just an example, I don't have a tach installed right now, so I can't tell my revs...

But, if you launch at lower RPM's, wouldn't it still be ok because, even though you would have to slip longer, the difference between engine speed and wheel speed (wheel=0 obviously) would be much less, so it would be ok to slip the clutch for longer because each second of slip would cause less wear. This is what I heard the CarTalk guys say on the radio- that when you normally launch your car, "it should be on the virge of stalling." This is correct reasoning, no?