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Originally Posted by JDM-dono
Had a mate sit in the car to give me pointers. Turns out that I was releasing the clutch too quickly.
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See? What did I tell you?
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When I was shifting from 3->2 there was a mismatch of engine speeds between the transmission and engine.
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Yes.
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When the clutch is suddenly engaged, one of these components (engine or transmission) has to play catch up…
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Engine.
When you de-clutch, the revs drop towards idle speed of course. When you engage a gear, the rear wheels are now “driving” the input shaft and, thus, the clutch disk at the rpm determined by the road speed and gear ratio.
The clutch disk is spinning much faster than the flywheel which is connected to the engine. Abruptly clamping them together creates a shock and the slower one is suddenly dragged up to the same speed of the faster one.
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so the rear tyres lock up or more accurately drag along the road.
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Yes. Since the engine, via the flywheel, cannot speed up instantaneously to match the rear wheels, the drive wheels, rear tires here, are slowed dramatically and are literally dragged down the road, protesting loudly. The rear wheels are not actually locked up, they are skidding though, but it’s just easier to describe it that way since the dynamic effect is largely the same.
You’re very unlikely to crash doing this at 18 mph. Your tail end might twitch a bit, but if the car did start to go sideways on you, it would scrub off speed so fast that you’d be unlikely to loop it or hit anything.
ANY TIME you chirp the rear wheels under deceleration, you’ve done it wrong, mate.
At low speeds, this is just poor driving, "sloppy," you know, and hard on the machinery. At high speeds it can be dangerous and can even prove to be fatal in the ensuing crash.
It is difficult to cover all the details while
writing a description, and I’m too
lazy to do a thorough job of it. I can do better talking to you in person. I'm
lazy, I tell you!
Are you getting a handle on this business, now?
And you youngsters out there who are reading and trying to learn on this forum… is this making sense to you, too?
Any questions?