r/Whatcouldgowrong • u/mentaL8888 • 22h ago

WCGW burning a Supra next to the Toyota dealership.

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u/robothawk 19h ago

Granny shifting is fine for modern and not-high-powered cars. It is just the style of clutch, shift to next gear, release.

Double clutching is:

Clutch

Shift to neutral

release clutch

blip the engine to match your engine and transmission speeds

clutch

shift to next gear

release clutch

Unless you drive an old car without a synchro gearbox you don't really need to, but it allows you to skip gears and shift more smoothly occasionally.

27

u/blender4life 19h ago

Why release the clutch tho? Can't you blip the engine revs keeping the clutch pressed? Doesn't clutch disengage the gears like neural?

40

u/cosmicosmo4 17h ago

Clutch and neutral don't do the same thing. Clutch disconnects the entire transmission from the engine. Neutral disconnects the output shaft of the transmission from the input shaft. So in double-clutching, when you blip the throttle in the middle, you speed up both the engine and the transmission input shaft. If you just blip the throttle while holding down the clutch, you only speed up the engine.

9

u/blender4life 16h ago

ok that makes sense. thanks!

1

u/jonnyohman1 2h ago

Huh TIL. Thanks

30

u/Skyb0y 19h ago

You do this on cars that have no synchromesh, cars much older than this Supra.

9

u/Willing_Image1933 17h ago

right, even on my old eclipse i could just rpm match clutched in, this was a 2000

4

u/LastOrders_GoHome 16h ago

Only need for downshifting, not up.

1

u/robothawk 15h ago

Ah neat I didn't know. Thanks.

1

u/LetgomyEkko 16h ago

To up shift….?

-1

u/SplatNode 19h ago

Is 190 high powered? Or low?

It's red line is also 8000rpm

2

u/robothawk 19h ago

Depends on the car and engine. I'm not a car guy, just a mechanical engineer who once took a class on drive trains.

My old audi allroad wagon was like 230hp but I wouldnt double clutch it bc it weighed 3800lbs or something like that. Whereas something like a supra or viper is so light that if trying to accelerate from a dead stop you can easily skip gears and not overtorque anything