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Old 02-11-2001, 04:51 PM   #1
CO Sube
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Join Date: Feb 2001
Location: Boulder, CO
Question Benefits from a flywheel?

I am considering a 12lbs. flywheel for my RS. Does the flywheel actually make the car faster or is it just for improved feel?

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Old 02-11-2001, 05:18 PM   #2
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I makes it faster - allows the engine to rev faster, and carries the car along faster as a result.

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Old 02-11-2001, 05:46 PM   #3
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2000 S201 #78, '95 L
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Does it make the car slow down quicker after you let off the gas? Would a lighter flywheel be useful on both a 5-spd and an auto?
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Old 02-11-2001, 05:59 PM   #4
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yes which would also cause it to stall easier if you're not concentrating.
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Old 02-11-2001, 08:55 PM   #5
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2000 Impreza W"RS"X
Blue Ridge Pearl


The theory would be that it will make all your gears alot more powerful than they are now. That is because its easier to get the revs up, especially 4th and 5th. When I get it I will let you guys know.
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Old 02-12-2001, 03:06 AM   #6
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I was thinking about getting this mod eventually too, but I live in a hilly area, and I think that the lighter fly wheel might actually hhinder performance.

My thinking: A heavier flywheel stores more kinetic energy (well I guess if it's storing it, then it's potential energy...oh well), so when it's in motion, it's more likely to stay in motion. So if I'm in a flat part of the hill, and I reach an uphill part, then I should have more momentum with the heavier flywheel. Would a lighter flywheel still rev faster in this situation?

I'll probably do more research on this before I find it, but if someone has the answer, please enlighten me. Thanks.
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Old 02-12-2001, 05:02 AM   #7
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I was considering the lighter flywheel, but now that I have turbo'd my car I don't think I will get one.

1st and 2nd go by way to fast now, and with a lightweight flywheel the problem would be compounded. If the rev limit was a bit higher the flywheel might be worth it to me with the turbo.

I would be curious to drive a car with a flywheel to actuallly feel the difference.

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Old 02-12-2001, 06:41 AM   #8
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I was thinking of upgrading (or downgrading, depending how you look at it) to a lighter flywheel simply because it takes about 3x as long as it takes me to complete a shift for the engine speed to get back down. So every time i shift i am waiting for the engine before i can get back on the gas (normal city driving here folks, I am not trying to kill my clutch to shave a couple tenths off my 0-60 )
any thoughts on this theory? anyone else notice it seems to take an awful long time for the engine speed to drop?
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Old 02-12-2001, 09:46 AM   #9
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06 Evo IX MR


A lot of factory turbo cars used come with HEAVIER flywheels for just this reason, and to make launch easier, the flywheel stores enery to get the car through the lag period... I don't know if they still do.
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