Power Shifting

Ok im not sure if everyone does this i havent heard it much but whats the pros and cons of power shifting? Its when your driving and when you shift you dont let off the gas but you hold the clutch for a second and shift.

my guess is... if u are too slow at shifting gears then you can over rev the engine causeing the valves to float and end up screwing over ur engine.

feathering the clutch? i don't find it useful in the least.... maybe its just me though

you might not over rev the engine persay unless you dont have a rev limit, but yeah if you shift slow you would bring the engien up to rev limit or if you dont have a rev limiter as sensei said, you can over rev your motor which actually coudl result in a blown motor.

also power shifting fucks up your tranny,

It will only benefit if you have an aftermarket clutch, otherwise it will slip like crazy.

so wats the difference if you dont do it? You wont go down like 2 mph wehn you shift?

It's fun to do but very hard on the engine and trans, especially when you miss a gear.

I do this on instinct now when i shift from 1st to 2nd unless I'm paying attention. Not a good feeling or sound when you miss the gear and all you hear is grinding. I also smell burning oil whenever I do it with the rpms fairly high (could just be my cat though.) Of course I really don't care about my engine or tranny at all because I'm going to do a swap before I end up blowing it up. But by not doing it you MAY lose a mph or 2 at the most. I say keep it for the track only and save your engine and tranny a little more.

Power shifting is usless unless you have something like Hondata that has built in full throttle shift. You're asking to kill you motor/tranny.

in my mind its just gunna wear out ur clutch. You can actually get power to the wheels faster by having the clutch not slide as much by getting off the gas and then reving up the motor with the clutch engaged at a lower RPM. If that makes any sense, it works for me.

That's called rev matching, one form of that is heel toe.

heal toe is crazy man i tried it downshifting before a turn in my neighborhood, its crazy hard breaking while rev matching. prolly didnt help i was in dress shoes going to work lol

That's called rev matching, one form of that is heel toe.
Isn't that only for downshifting though?
It's hard to do unless you have little racing booties, I practice it a lot but my feet are too big.

I would call that clutch burning. Shifting without the clutch up/down works best for me. "heel-toe" refers to the drivers right foot controlling gas & brake together during a downshift. If your doing that when accelerating your goin pretty slow. I find it nearly impossible to do the actual heel-toe is most cars because the pedal aren't setup for it. Big toe brake, right side foot gas, that's how I do it.

I did it all the time in my ITR...you just better make sure you have a rev limiter set pretty conservative. I used to do it so fast after awhile that I would shift at 8400 and be in the next gear by 9000. I remeber I was racing my ITR for the second time againts my boy in his AWD Talon and I shifted so hard that I took the top half of my shifter completely off and smashed my radio (momo shifter), shit hurt like hell and I lost the race.

Isn't that only for downshifting though?
It's hard to do unless you have little racing booties, I practice it a lot but my feet are too big.
Yes, basically you're trying to keep the engine at the optimal speed for exiting the corner (not straight line braking). As Jackassi said, there is almost no need for it unless you can just naturaly do it. I have a hard ime, I can do it, but it's rough at best, I find it easier to rev match after a downshift, just as bad for your motor/tranny, but less complicated.

i'm doing the double clutching/heel toe prettymuch on instinct now... just not double clutching when i use heel toe.. that shit is complicated.. go out one evening and find a nice empty road and practice.. it really helps you get the rev matching down, also, impresses people when they hear the car rev with the brake lights on :biggrin:

Why would you double clutch a car with syncros?

ya i dont get that either, pretty much all new cars have synchromesh anyways

cause it's fun! and it impesses people who have no idea what's happening, i heard it's better on your syncho's anyway.. makes em last longer or something.
good habit for me to get into before i build my 350+ hp beast :biggrin:

Why would you double clutch a car with syncros?
That's what I was gonna ask. The only benefit is reduced synchro wear, if your not road racing then it's not an issue. You know what's more impressive? leaving your left foot on foot rest, heel-toe brake gas while downshifting WITHOUT the clutch!

best advice - www.racingschools.com learn how to drive from the pro's since it's pretty hard to explain drving tecniques.

so when the gears grind, what actually breaks? is it the synchros or do the teeth on the gears actually wear down.

I've had several times when putting it into 2nd, I already have the clutch halfway out and it's about 1mm too late so it grinds and pops back out.