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Old 06-02-2004, 05:47 AM   #1 (permalink)
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Does an aluminum flywheel = lower 1/4 times or faster acceleration?

People always say the car revs quicker... is this meaning that the car is accelerating faster?
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Old 06-02-2004, 05:51 AM   #2 (permalink)
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i think of it as getting to optimum power band quicker...
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Old 06-02-2004, 06:11 AM   #3 (permalink)
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It probably will make getting good 1/4 mile times much more difficult. You need a lot more finesse to keep an engine that revs faster from breaking traction.
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Old 06-02-2004, 10:07 AM   #4 (permalink)
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faster car .
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Old 06-02-2004, 10:12 AM   #5 (permalink)
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Quote:
Originally Posted by Cobra4B
People always say the car revs quicker... is this meaning that the car is accelerating faster?
It should. The lightweight setups like Fidenza's reduce the weight of the Clutch/Pressure Plate/Flywheel by nearly 50% (something like 25 pounds). Besides the obvious simple benefit of the overall reduction in weight, the reduced mass means the rotational intertia of the assembly is also much lower. That rotational intertia looks like a much larger load to the engine that the weight alone would imply. And it takes HP to accelerate that flywheel mass as the engine speeds up. Reducing the rotating mass makes more HP available to the rest of the drive line, and that allows the rest of the driveline to accelerate faster. Since the car is attached to the driveline, it accelerates faster, too.

Because of inertia, rotating masses actually have an effect disproportionate to their actual weight. Reducing rotating mass is always a good way to improve acceleration. It pays back more than just the LBS you take out of the system.

Note that wheels also matter. They rotate, usually weigh as much or more than the clutch/flywheel assembly, have a larger diameter, and of course there are 4 of them. Interia varies with the square of radius, so the same weight hurts more in a road wheel than a flywheel. While I have no science to back it up, the rule-of-thumb I've heard is that every LB of rotating wheel weight is the equivalent of 4-5 LBs of dead weight.

You don't actually get more HP from the engine, of course, but it ends up looking that way to a dyno (and Seat Of The Pants). Since the inertia only consumes power when it's being accelerated (I'm totally ignoring friction here), the top speed of the car is unaffected (but you get there quicker).
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Old 06-02-2004, 11:12 AM   #6 (permalink)
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And, because you are accelerating quicker in lower gears, the effect is much more noticable in 1st and 2nd, versus 3-6.

-Jake
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Old 06-02-2004, 11:37 AM   #7 (permalink)
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Thanks everyone... I'm really leaning toward a LUK stage II when I replace my clutch. $800ish but hopefully I won't have to do a clutch again even w/ h/c.
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Old 06-02-2004, 12:11 PM   #8 (permalink)
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Very well said RocketSled!

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Old 06-02-2004, 01:36 PM   #9 (permalink)
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have you found the Z06 stocker to be insufficient with 400+ rw?

I was thinking of moving up to a Z06 stocker on my car-of-all-trades, (will be ~425-450rw) but perhaps a touch more than that is in order?

-Jake
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