Double clutching & other ways to shift

QuantumMotorsports · 07-31-2001, 09:36 PM

Double clutching is when you press the clutch once to bring the tranny out of gear. And then release the clutch with the tranny in neutral and rev the engine to bring the tranny main shaft up to a speed that is "synchronized" with the output shaft of the tranny(which depends on what gear you are shifting into and how fast the vehicle is going) You then press the clutch pedal again and put the tranny in the next highest gear. There is absolutely no reason to do this unless your tranny grinds gears with the clutch in. That is what a synchronizer is for. It slows the main shaft of the tranny using friction to the same speed as the next gear when upshifting (because your engine RPMs will drop after entering the next gear) And speeds up the main shaft when downshifting. You can hear this on most older T5s with worn synchros when downshifting say at about 35 or so into second gear. You will hear a whinning noise that changes pitch as pressure is applied to the shift lever to engage the tranny into a lower gear. Anyway, that's probably way more discussion than you guys wanted, but hope that helps.

------------------
Michael Black
Quantum Motorsports
Norman, Oklahoma

1988 Merc Cougar 5.0 HO, Ported and Polished E7TEs, 2.25" offroad H pipe w/ 2 chamber flowmasters, T5 tranny
New E/T!!!
14.626 @ 94.94mph, 2.194 60' time, a little better than last time. Keep in mind this thang is heavy (3590lbs) Finally 14s!!!!

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07-31-2001, 09:36 PM	#9
QuantumMotorsports Registered Member Join Date: Jul 2000 Location: Norman, Oklahoma, USA Posts: 597	Double clutching is when you press the clutch once to bring the tranny out of gear. And then release the clutch with the tranny in neutral and rev the engine to bring the tranny main shaft up to a speed that is "synchronized" with the output shaft of the tranny(which depends on what gear you are shifting into and how fast the vehicle is going) You then press the clutch pedal again and put the tranny in the next highest gear. There is absolutely no reason to do this unless your tranny grinds gears with the clutch in. That is what a synchronizer is for. It slows the main shaft of the tranny using friction to the same speed as the next gear when upshifting (because your engine RPMs will drop after entering the next gear) And speeds up the main shaft when downshifting. You can hear this on most older T5s with worn synchros when downshifting say at about 35 or so into second gear. You will hear a whinning noise that changes pitch as pressure is applied to the shift lever to engage the tranny into a lower gear. Anyway, that's probably way more discussion than you guys wanted, but hope that helps. ------------------ Michael Black Quantum Motorsports Norman, Oklahoma 1988 Merc Cougar 5.0 HO, Ported and Polished E7TEs, 2.25" offroad H pipe w/ 2 chamber flowmasters, T5 tranny New E/T!!! 14.626 @ 94.94mph, 2.194 60' time, a little better than last time. Keep in mind this thang is heavy (3590lbs) Finally 14s!!!!