Rev matching?

[Vroom_Vroom]

hey guys whats up! although iam a senior member of this board i still dont know what rev matching and double clutching means..can anyone explain to me? thanks!

[BoonyBoun]

Double clutching is used to downshift...but it is also used to upshift on older cars that do not have synchros.

Steps to double clutch:

1)depress clutch

2)shift into neutral

3)release foot from clutch

4)rev the engine high(about 5k or so)

5)depress clutch once again

6)downshift to a lower gear...it should go in very smoothly

7)release clutch and gas as normal

As you can see...the clutch is depressed and released twice...hence the name 'double clutching'. Hope this helps. :)

[GTS LAID]

rev matching is pressing the clutch in once, while its depressed matching the revs of the engine to the output shaft, and then letting go of the clutch...

does anyone know if there is a diff between a depressed clutch pedal with the car in gear and a non depressed pedal with the car in neutral? this would explain the diff between revving the engine in double clutching (tranny in N) vs. rev matching (clutch depressed maybe in N???)

[Modern Angel]

Originally posted by GTS LAID
does anyone know if there is a diff between a depressed clutch pedal with the car in gear and a non depressed pedal with the car in neutral? this would explain the diff between revving the engine in double clutching (tranny in N) vs. rev matching (clutch depressed maybe in N???)

The difference is that whenever you have your clutch pedal depressed your clutch is not touching anything... therefore if you blip the throttle when your pedal is depressed your engine is not connected to your tranny so your tranny's speed won't be changed at all.

This is why you need to double-clutch to rev-match when you're downshifting.. when you double-clutch the car is in neutral and you can raise the speed of your tranny up to the level it will need to be at (for a smooth shift) when you shift into the lower gear.

Hope that all makes sense.. :)

[GTS LAID]

no it doesnt make sense... i dont think you're right but thx anyone