WTF is "double clutching"?

[JoLLyRoGer]

Anyone? Someone, please explain it to me???

 

[Biggerhammer]

When shifting gears, you push in the clutch, shift to neutral, relase then push in the clutch again, then shift into the next gear.

It's necessary in transmissions that have no synchromesh, I think... I don't know much about it.

 

[BrokenVisage]

Something that is done in Fast and the Furious as opposed to 'granny shifting'.

 

[Sukhoi]

Originally posted by: Biggerhammer
When shifting gears, you push in the clutch, shift to neutral, relase then push in the clutch again, then shift into the next gear.

It's necessary in transmissions that have no synchromesh, I think... I don't know much about it.

I'm not exactly sure either, but I think you have to do the shift to neutral because then that spins up some part of the driveshalf that would normally be disconnected and at the wrong speed if you just shifted straight into a gear.

 

[AMDZen]

Your in first gear, You depress the clutch once and remove the shifter from the first gear notch, then you release the clutch pedal, and depress it again before you move the shifter into the second gear notch.

Truckers do this because there is so much torque that the synchro's in the tranny will be better aligned using this method rather then simply shifting normally.

Drag racers do it for the same reason.

 

[Tu13erhead]

Google..

http://www.wisegeek.com/what-is-double-clutching.htm
http://www.answerbag.com/q_view.php/4101
http://www.epinions.com/auto-review-6902-1618F526-3A351631-prod4
http://en.wikipedia.org/wiki/Double_clutch
http://www.elecdesign.com/Articles/Index.cfm?AD=1&ArticleID=6137

:roll:

 

[SampSon]

Originally posted by: Biggerhammer
When shifting gears, you push in the clutch, shift to neutral, relase then push in the clutch again, then shift into the next gear.

It's necessary in transmissions that have no synchromesh, I think... I don't know much about it.

That about nails it. It was mainly used back when transmissions had no synchros.

As for race drivers, I dunno.

 

[Riverhound777]

Watch the chase scene in the movie Bullet and you will hear it. You shift to neutral, give it a little gas, then shift into the next gear. Like was said ealier, it has to do with the lack of syncros.

 

[Demon-Xanth]

It's only for transmissions that aren't synchronized, which are VERY rare now. I haven't heard of them being in a performance app for a long time. Double clutching just wastes time. You'll see it most used in old trucks (LARGE trucks).

 

[TheLonelyPhoenix]

Originally posted by: Biggerhammer
When shifting gears, you push in the clutch, shift to neutral, relase then push in the clutch again, then shift into the next gear.

It's necessary in transmissions that have no synchromesh, I think...

QFT.

I'm pretty sure truck drivers only double clutch just to keep themselves from shifting too fast.

Edit: Or in an older truck without a syncro-ed transmission, as someone else mentioned.

 

[spidey07]

who the heck double clutches on an upshift???

 

[Majunior]

In auto racing, double clutching is used to maintain the (weight) balance of the vehicle with downshifting. if the vehicles weight shifts drasticly it will upset the balance, causing the car to perform unpredictably... if in a turn, you down-shift and the car jerks around then you could lose your line, or perhaps have lots of oversteer.

It's a lot like the simple method of rev-matching when downshifting, but instead of just the engine reaching the same speed as the tranny, the synchros get matched too.... say you are in 4th gear and want to down shift to 3rd. here is how the double clutch method would work.

pull out of 4th... blip the gas to get the engine to speed, release the clutch(still in neutral..this is where the synchros match), clutch in, stick it in 3rd, and clutch out.

hope this helps

 

[Jzero]

Double-clutching triggers the NAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAS!

 

[TheLonelyPhoenix]

Originally posted by: spidey07
who the heck double clutches on an upshift???

Hey, Vin Diesel wins drag races doing that. Don't question The Vin.

 

[JoLLyRoGer]

Cool, thanks for the replies guys (and gals). I can now sleep peacefully.
JR..

 

[Syrch]

wouldn't "Granny" shifting be quicker then?

 

[Majunior]

Originally posted by: spidey07
who the heck double clutches on an upshift???

The fast and furious writers didn't have a clue about what they were writing. You DON"T double clutch when up-shifting. there is no need to, the synchros are already running at the same speed as the engine.

 

[DivideBYZero]

Originally posted by: Majunior

Originally posted by: spidey07
who the heck double clutches on an upshift???

The fast and furious writers didn't have a clue about what they were writing. You DON"T double clutch when up-shifting. there is no need to, the synchros are already running at the same speed as the engine.

YOU BLEW THE WELDS ON YOUR INTAKE!

 

[quakefiend420]

Originally posted by: Majunior

Originally posted by: spidey07
who the heck double clutches on an upshift???

The fast and furious writers didn't have a clue about what they were writing. You DON"T double clutch when up-shifting. there is no need to, the synchros are already running at the same speed as the engine.

crap

everything i know about racing has been learned from fast and the furious...no wonder i keep losing

 

[spidey07]

Originally posted by: Majunior

Originally posted by: spidey07
who the heck double clutches on an upshift???

The fast and furious writers didn't have a clue about what they were writing. You DON"T double clutch when up-shifting. there is no need to, the synchros are already running at the same speed as the engine.

that's why I was confused on people talking about upshifting.

I only do it while downshifting. Like coming into a corner really hard and you want to go fro 4/5th to 2nd.

 

[Doboji]

Originally posted by: Majunior

Originally posted by: spidey07
who the heck double clutches on an upshift???

The fast and furious writers didn't have a clue about what they were writing. You DON"T double clutch when up-shifting. there is no need to, the synchros are already running at the same speed as the engine.

Oh thank god!... I thought I was driving like a granny...

 

[MBrown]

Double Clutching.

 

[Jzero]

Originally posted by: spidey07

Originally posted by: Majunior

Originally posted by: spidey07
who the heck double clutches on an upshift???

The fast and furious writers didn't have a clue about what they were writing. You DON"T double clutch when up-shifting. there is no need to, the synchros are already running at the same speed as the engine.

that's why I was confused on people talking about upshifting.

I only do it while downshifting. Like coming into a corner really hard and you want to go fro 4/5th to 2nd.

On a "modern" transmission you can just rev match and release the clutch. There's no technical need to release and re-engage the clutch.

 

[spidey07]

Originally posted by: Jzero
On a "modern" transmission you can just rev match and release the clutch. There's no technical need to release and re-engage the clutch.

True. But it does feel a lot smoother. plus it's just fun.

 

[Jzero]

Originally posted by: spidey07

Originally posted by: Jzero
On a "modern" transmission you can just rev match and release the clutch. There's no technical need to release and re-engage the clutch.

True. But it does feel a lot smoother. plus it's just fun.

Yeah, I do it, too