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Personally, I've never launched my car before nor do I plan on doing it unless I'm at a track or being called out, but anyways, here is my question-

When learning to drive a stick, they tell you to let the clutch out slowly, so the gears have time to catch, else you are going to stall. But when racing, I've heard people say they let the clutch pop out when dropping it at 6-7k RPM. So why doesn't the car stall out when you are letting it pop out so quickly? Or am I misunderstanding what people mean?

pierceman

you need to have the rpm's at around 7000-7500 then dump the clutch. do not do it too often, our cars have week diffs.
MAtt

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My question was on the matter of "dumping the clutch". I was confused as to why it doesn't stall when you let your foot off the clutch pedal (side step) and let it spring up. Because it stalls if you do that during normal driving.

lyndon_h

It is better to dump the clutch at 7k than 4.5k because the tires should spin at this rpm when dumping the clutch. I haven't tried it though, I don't stoplight race.

Darksyde

When you launch the car at 7000 rpm "pierceman" the engine is rotating at a high rpm so when you dump the clutch the engine has enough energy to spin the clutch/flywheel/transmission gears/diff. If you launch it at 2500 rpm all you'll do is bog and stall because there isn't enough energy to get everything into motion.

jeffbrig

Because at that engine speed, there's enough rotational inertia to overcome the sudden clutch drop and still get the car going without stalling. More specifically, at 6-7k you're hoping to get a little bit of wheelspin, and as you give it more throttle, the rpms don't even drop.

I haven't done it either, and don't plan to. Diff-soup is expensive to repair. My most agressive launch has been to feather the clutch between 4-5k when having to jump out in heavy traffic.

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Thanks! That was exactly what I wanted to know.

djohnston

You want to break the rear tires loose immediately, hence a high-RPM clutch drop. That way most of the damage is done to the tires, which are relatively easy to replace as compared to the damage you'll do to the clutch and differential if you don't break the tires loose. Either way it's doing damage to something, I've had my S for almost three years now and I've never done a burnout, except when on loose gravel or grass where there isn't any stress being put on the car by spinning the rear tires. You decide, if you like paying for repairs not covered by the warranty, go ahead and have at it.

mustangkiller

i was stupid and wanted to see what would happen with an 8.5k
launch believe me it wasn't nice since than i've learned to keep it at the v-tec area and it works fine just make sure the oil in the rear is good at all times