power shifting

[Humza]

what is it? Will it help my 02 GTS stay in lift on the 1-2 shift? How bad is it for the tranny?

[kkrkeith7]

i think it's when you shift you keep the gas pedal down and never take your foot off, not sure exactly.

[YOshi31]

no its when you hold the clutch on the catch point where you can shift and move the car so you dont move you left foot and its very bad for the tranyburn that clutch baby

[oldster]

Originally posted by YOshi31
no its when you hold the clutch on the catch point where you can shift and move the car so you dont move you left foot and its very bad for the tranyburn that clutch baby

Huh?

[pokgai]

Originally posted by kkrkeith7
i think it's when you shift you keep the gas pedal down and never take your foot off, not sure exactly.

im pretty sure thats right. you shift without letting off the gas, so the RPMs dont drop when u shift. its bad cuz it burns out your clutch faster cuz you are shifting at such a high RPM.

[Sups]

err....i think i have an idea of what he's talking about. basically at that point you can shift and move...

try this..

on a flat leveled road(make sure you dont roll back or forward when your in neutral). put your car in gear and slowly lift your left foot(do not add gas). when your rpms drop to like .5 your car should move without gas.

[YOshi31]

Originally posted by Sups
err....i think i have an idea of what he's talking about. basically at that point you can shift and move...

try this..

on a flat leveled road(make sure you dont roll back or forward when your in neutral). put your car in gear and slowly lift your left foot(do not add gas). when your rpms drop to like .5 your car should move without gas.

yeah but hold it there and then floor it and you can shift at the same time

[Maelfyn]

Um. Powershifting is when you keep it full throttle between shifts. The idea is to engage the clutch and change your gear within milliseconds, hence minimizing your time lost.

When done properly, I would imagine it's bad for your syncros and your clutch.

[eDriXxxX]

Yea i thought it was just flooring it while shifting...

[MaasNeotek]

Done properly - powershifting isn't as dangerous as you'd think - you are just moving the impact of shifting to another spot...

Powershifting... redline shifting... whatevah it's called where you live is done like this:

Try this some time. 3rd Gear, full throttle. After 3k rpm, while under throttle, try to pull back on the shifter. You won't be able to. (If you can - take that gearbox back to your dealer.)

The reason it's stuck in place, is that the lateral force (torque force) is holding the gears together.

Powershifting uses this torque to achieve higher shift speeds, and landing points through a redistribution of power losses during shifts.

To powershift the 1-2 shift...

1. Floor it. (That part is easy).

2. Rest your foot on the clutch (don't ride it - you just want it close)

3. While your foot is to the floor on the gas, put some pull pressure on the shifter as you pass 6krpm - you can pull like mad on the shifter, and you'd likely break the shifter before it would pull outa gear. When you get to your shift point, push your foot onto the clutch, careful to stop pressing in as SOON as the shifter moves out of gear. You only want to push the clutch in far enough to break the torque on the gears.... as soon as the shifter starts moving - don't push further - but don't let up on it just yet!

3a. Since you are pulling on the shifter, the sucker will fly into second gear - probably very quickly.

4. As soon as the shifter is in 2nd - sidestep the clutch - get the hell off. As fast as you can!

First thing to note: I NEVER SAID LET UP ON THE GAS. When you perfect this, your in neutral for much less than a 1/4 second. Just takes practise. Keeping your foot buried ensures that the engine power is there to move the car when the clutch re-engages.

What you've done is this - tapped the clutch in JUST far enough to disengage the flywheel. (The whole clutch point is probably less than a 1/2 inch of pedal travel...) As soon as the engine torque is gone - the shifter will release, and since you are pulling on it - it's going to fly into the next gear, and by sidestepping the clutch, you are now dropping full engine power into the clutch in an instant. The benefit - more power to the driveshaft instantly, instead of dumping the power into heating your clutch, and wearing it out.

Shifting this way will of course remove some of the friction losses at the clutch (not rubbing long at all - so limited wear) however... it will now transmit all of that power through the clutch to the differentials, and driveshafts. (And they cost way more to replace should something let go.)

Every solid drag racer in history with a clutch shifts this way - it's the fastest, and gives you the least impact on the acceleration curve - however, like I said - it's not without risks... Your driveshafts and diff (and tires) now have to take the force. Something has to give. More often than not - it's the tires (spinning) and the suspension (doing this hit's pretty hard - it's fun!)

Ask an experienced driver to show you how sometime...

Or try yourself!

If you want to try this - try the first few times at lower rpm (5-6), so that you know what it feels like - it's a little disturbing the first time.

Cheers

[Humza]

thanks maasneotek...... i tried it today and landed the 1-2 shift at 6200rpm in my 2002!!! I'll probably only do it when i'm racing cars like the rsx-s, prelude, and gsr cuz those races will be close. If i'm racing a protege or si i'll prolly just shift normally.

[ohwhatafeeling]

According to Sport Compact Car, Super Street and Hot Rod Magazine; power shifting is NOT recomended. It increases transmission and drivetrain "wear and tear" and can break any part within these two specifics. In rear-wheel cars, its been known to break differentials. Especially if you have an LSD...its too much grip for the axles...on a front wheel drive, it sounds like instant clutch fry.

[MaasNeotek]

You'll never 'Fry' a clutch through overheating - though it is possible to shatter a part doing this. As with any true racing technique, you are truly driving the machine to it's limits - and you need to be aware of that. You'll be replacing parts more often than if you drove like a grandma. But - if you really need to land those 2 cam shifts - this is the shiznit.

Keep in mind though - you are bypassing the 'safety' that the clutch slip gives you - and dumping all of your power on at once.

Use the technique as you will - but don't be surprised if you end up breaking something...

That said - we've been powershifting the supra for a year - no ill effects. (Though we could actually see the clutch pads outlines on the flywheel when we did the pre-rebuild breakdown... very cool).

[Austinbrtndr]

granny shiftin when you shoulda been double-clutchin.......
same concept or no?