After searching this forum, I've come up with the following conclusions:
pro's
-increased throttle response
-increased acceleration most notably in lower gears, but noticeable even on freeway
con's
-rattles when clutch is let out at idle
-possible chance of ratter at unpredictable times
-flywheel shattering
-difficult to use in stop and go traffic
-hard to go up a hill with
I haven't found a single thread regarding quantifiable objective gains from a lightweight flywheel, some people just claim it's a night and day difference while others claim it's not that much faster.
So finally, my question is has anyone had increased 0-60 times? 1/4 times?
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Who is the supplier of UUC Stage 2 flywheel referred to who is one of the sponsors of this site?
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http://www.uucmotorwerks.com/
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Quote: | unless your car is turboed or charged, then it doesnt benefit as much for NA cars, waste of money IMO..$600 for a flywheel is absurd..for minimal gains, unless you only track it, stop and go traffic really blows |
+1 I have one on my turbo M3 and it is great for me. On my stock m3 I have no use for it.
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It depends greatly on your engine size and car weight --- mostly on car weight.
It takes torque to get your car moving. The heavier the car, the more torque is needed. At low rpms (for instance when idling at a stop light) your engine produces very little torque. But a flywheel stores energy in the form of torque and gives you a shot of torque to get your car moving. It doesn't last long, but it's enough to get you started withought stalling your engine or having to rev high and slip the clutch. The heavier the flywheel, the more energy it stores.
A flywheel does NOT reduce driveline efficiency. The energy that goes into getting the flywheel spinning is saved and used to drive the car.
A light flywheel allows you to rev your engine faster when the clutch is disengaged. Whoopee!
A heavier flywheel is easier to drive on the street for most cars because it is more forgiving of driver errors. If you engage the clutch a little too quickly without enough throttle (we've all made that mistake when we were learning to drive a stick) you are MUCH less likely to stall the engine or find yourself riding a bucking bronco if you are using a heavy flywheel rather than a light one.
If you have a very light car a light flywheel may have benefits in a racing situation.
I have had both and the lightweight flywheel was a royal pain to drive on the street.I had to replace them often, too. The heavy flywheel was easier to drive and lasted longer.
In my 650i the stock flywheel feels just fine.
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Lightweight Flywheel Yes or No?