double clutching

87foxstang · Sep 24, 2007

ok, ive heard of this a few times, not counting the fast and the furious
Ive even seen it mentioned a few times in the forums, what the hell is it exactly

25thmustang · Sep 24, 2007

Here is the breakdown as I know it...

Double Clutching: Slowest of the shifting, was used long ago in big rigs more often than not. You start off in gear, when the time to shift comes, clutch in, pull the shifter into neutral, clutch out, clutch in, pull the shifter into gear. I guess this is used to help line the gear faces up in trannys without synchroes. Not something any new car needs, and not something used in racing.

Speed Shifting: Might even be as slow as double clutching. This is used when you have clutch issues more times than not. When the time comes to shift, you get to an even pedal pressure, not accelerating and not completely letting off. You slide the shifter out of gear without touching the clutch. Then put pressure on the next gear, and use the pedal pressure to bring the RPM easily yo the right spot (you just feel for it) and the shifter will slide into gear. Not used for racing, I have only used it for fun and when my clutch cable goes.

Regular Shifting: Used by most in normal driving and racing. With the car in gear, you push the clutch in, put the shifter smoothly into the next gear, and release the clutch. You do so by letting off the gas in between the shift, and rolling into the throttle for the next gear.

Powershifting: Used in racing only more or less. With the car in gear, get ready for the next gear with a little pressure on the shifter. When the right RPM hits, leave the gas to the floor and stab the clutch. Move the shifter (hence the pressure towards the next gear) as fast as possible, and have that clutch out before the RPMs scream to the limiter. When done right, the RPMs shouldn't climb much at all, the car shouldn't nose dive on the shift, and the timeslips should show it.

Thats about how I see it. I also prefer the last one, without it, I would probably have a mid 13 second car, .

87foxstang · Sep 24, 2007

ohh so thats double clutching huh. Wierd if you ask me, why anyone would do that in a car like ours is beyond me. Thanks for clearing that up dude.

TRWXXA · Sep 24, 2007

87foxstang said:
ok, ive heard of this a few times, not counting the fast and the furious
Ive even seen it mentioned a few times in the forums, what the hell is it exactly

I don't think double-clutching has been required on cars since the 1920's.

Synchronizing gears have eliminated that need. If the synchros go bad, it's possible that you'd need to double-clutch to get the gears to mesh smoothly.

Double-clutching is accomplished by putting in the clutch, and moving the gear selector to neutral. Now you have to match the speed of the trannsmission's input shaft to the speed of the next gear you want to select. Release the clutch, and if you're up-shifting, let the engine RPM decrease to the RPM it'll be at in the next gear, put the clutch in, select the next gear, and release the clutch. If you're downshifting, rev the engine up to the speed that the lower gear will attain, put in the clutch, select the lower gear, and release.

It takes a lot of practice. If not done right, the loud grinding noise will tell you and everyone else around that you screwed it up.

SVT32VDOHC · Sep 24, 2007

I will stick to regular shifting! NO way would I powershift. I can just see something going wrong. That means I will have to spend $$$$ fixing instead of modding/gas in the tank/ insurance/car shows etc...

Flavadave4 · Sep 24, 2007

Double clutching is still used in comercial trucks.

My personal favorite is the "no lift shift"
Its the same thing as 25th's Powershifting!

87foxstang · Sep 24, 2007

Flavadave4 said:
Double clutching is still used in comercial trucks.

My personal favorite is the "no lift shift"
Its the same thing as 25th's Powershifting!

hahaha the "no lift shift", ive never heard it called that before, thats a good one

25thmustang · Sep 24, 2007

No lift, power shift... either way its the same idea.

I have heard of people breaking them, but I have been powershifting for a solid 5 years on the same stock T5. Had it freshened up back in 03 I believe and never had an issue with it. Granted the same WAS true for my stock rear, and the ther day that went boom.

You gotta pay to play, and I can't stop powershifting now, so I am just prepared for the worst.

87foxstang · Sep 24, 2007

wow i cant believe you've been powershifting for that long on a stock t-5, dayyyum.

88-378 · Sep 24, 2007

87foxstang said:
ohh so thats double clutching huh. Wierd if you ask me, why anyone would do that in a car like ours is beyond me. Thanks for clearing that up dude.

Maybe he has a diesel under the hood with a heavy duty 12 speed!

skunk21 · Sep 24, 2007

most states require you to double clutch to get your cdl. when I got my class a they wouldn't let you "float" the gears double clutching only. when I'm driving my truck I only use the clutch to start out then bring it up to the right rpms and drop it right into the next gear, down shifts I move into neutral blip the throttle to raise the rpms and drop into the lower gear.

LOL I have caught myself leaving work and upshifting my stang w/o the clutch, w/o even thinking, darn habbits.

ttop88 · Sep 24, 2007

Double clutching went out with the advent of syncronizers. But I do think they have weekly classes over on the honda boards.

25thmustang · Sep 24, 2007

87foxstang said:
wow i cant believe you've been powershifting for that long on a stock t-5, dayyyum.

Yeah, funny thing is we had our 91 LX and now our 86 GT running low 12s on the same stock T5, and that just blew 3rd and 4th. I think it was from too many missed shifts though, my brother was learning on it, and missed a good amount of gears going down the track. getting rebuilt as we speak, and Saturday the car should go low 12s, maybe crack an 11 with me powershifting it .

87foxstang · Sep 24, 2007

wow thats awesome...So are you going to LVD this saturday?

Foxfan88 · Sep 24, 2007

a proper and crisp, fast powershift doesnt seem to hurt the tranny at all.

i powershifted the hell out of mine at the track last weekend, was doing it pretty good and it didnt hurt the tranny at all. before when i first stared doing it i was slow and it DID hurt the tranny i could feel and hear it, once you get good enough and fast enough it doesnt hurt it as much.

25thmustang · Sep 24, 2007

87foxstang said:
wow thats awesome...So are you going to LVD this saturday?

No Tasca Day at New England Dragway... Going to go up there and try to run with the H/C/I cars. Had one guy last year cheating big time. Went out and when everyone else was going 11.9-12.4 he ran a 10.xx @ 125. Needless to say when we cought on he ran a 12.x @ 109 (must have been spraying). Then in eliminations he tried spraying it again and missed 2nd and 3rd and lost with a mid 12 second pass. Glad the loser who tried blatently cheating lost in the first (maybe second) round, because he couldn't drive.

I am not sure if it hurts it or not, but a clutch will dictate how bad it is. A weak clutch will be easier on the tranny than a hard one.

87foxstang · Sep 24, 2007

damn, thats pathetic trying to cheat like that, what a moron

25thmustang · Sep 24, 2007

Yup and because I wasn't racing I went over and asked about the car, acting as the kid who didn't know. He told me full length headers and a cam about the same as a B cam. He was an arrogent prick, and next time I walked by I made a nice comment about nitrous not over coming a bad driver...

87foxstang · Sep 24, 2007

haha way to go ...make sure he knows hes a ****ing prick

blackened88lx · Sep 24, 2007

Foxfan88 said:
a proper and crisp, fast powershift doesnt seem to hurt the tranny at all.

i powershifted the hell out of mine at the track last weekend, was doing it pretty good and it didnt hurt the tranny at all. before when i first stared doing it i was slow and it DID hurt the tranny i could feel and hear it, once you get good enough and fast enough it doesnt hurt it as much.

Don't feel too comfortable. I felt the same way for a while. My stock t5 shifted smooth as silk, never grinded, and took every powershift without a complaint. Until one day I slammed it into 3rd and ended up with half the teeth missing. Most people would learn at this point, but powershifting is an addiction, and without it you might as well drive an automatic. I will powershift the **** out of my new $1100 gearset without mercy. It's just how a stick car should be driven.

double clutching

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