Pros and Cons of a light weight flywheel. - Page 4

98ss · 05-21-2008, 09:31 AM

Quote:

Originally Posted by AnorexicSTI

1. I disagree. 10 lbs saved in the driveshaft is very significant as it is rotational weight... the 1 piece design vs a 2 piece design like stock also helps as u don't get a power loss at that extra u-joint. the extra joint also adds a bit of "slop" when getting on and off the power.

I agree with above, as the first thing I notice with the 1 piece shaft is how connected my rear diff feels.
It's a nice solid feeling. But also I imagine in this case 1 piece shaft will give more shock load to the rear diff. But I hope carbon will help with flexing a little.

Okeyd57 · 05-21-2008, 10:22 AM

Quote:

Originally Posted by AnorexicSTI

I guess I'm the only one that loves not only my SUPER light flywheel but my SUPER light clutch as well... 19.5 lbs total (pressure plate, flywheel, disc)... which is the same weight as just the stock flywheel by itself ... or about 17 lbs lighter than stock overall weight of the pressure plate and flywheel assembly (about 36 lbs).

THE ONLY negative in my humble opinion is the increased noise... If someone knows of a way to get rid of that "chug chug chug" sound on deceleration, please let me know.

Why would a flywheel make a chugging noise on deceleration ? I've heard bov's do that, but not flywheels.

AnorexicSTI · 05-21-2008, 11:25 PM

Quote:

Originally Posted by Gixx6

I had a lightweight flywheel (went from 19lbs to 9lbs) in another one of my cars with a 6 puck sprung clutch and I will never do it again. You lose all streetability of the car, must rev it higher in order to be able to get off the line especially without chatter, made hill starts a pain.

I currently run a 6 puck unsprung disc... it's just as streetable as stock with the proper pedal inputs... it's harder to drive smoothly, but that doesn't mean it can't be done.

AnorexicSTI · 05-21-2008, 11:29 PM

Quote:

Originally Posted by Okeyd57

Why would a flywheel make a chugging noise on deceleration ? I've heard bov's do that, but not flywheels.

Well I'm not entirely sure of the technical explanation but I believe a heavier flywheel helps damp some of the harmonic vibrations of the motor at certain engine speeds. When going lighter, it changes the frequencies that get damped. Just so happens that the ones that no longer get damped are very audible, at least in an Impreza. Some people can't stand the noise. I don't really mind it.