Thread: Lightweight vs stock flywheel; momentum

So, I'm having a discussion about lightweight flywheels with a guy from our club.

Basically, what car rolls further when cruising at a certain speed, and then letting go of the throttle, one with a stock flywheel, or one with a lightweight flywheel?

And why?

there are so many different elements to that question it will be hard it answer. but in a perfert world with the road perfectly flat. the lighter wheel will go farther.

why? each wheel has had the same equal amount of force on it. the lighter wheel though takes less force to get it moving. less drag and friction. with the heavier wheel there is more weight on it which will make it stop quicker. something like that lol. maybe.

Ill bite im bored. Stock flywheel car rolls further. Lightweight flywheel revs up faster and revs down faster also. Thats the benifit of the flywheel is the revving up faster. The negative effect is that it revs down faster also.

Im assuming all things else are equal and this is on the same car AND the cars in gear...the same gear.

everything else being equal, the heavier fw will travel further because it will have more inertia to dissipate.

If you're coasting in gear, with no throttle being applied, the heavier flywheel will overcome the braking action of the engine compression more so than would the lighter flywheel... something along the lines of what Teal and Wangwang said.

If you clutched in, or had the car in neutral, then the car that's heaviest would roll furthest, everything being equal.

out of curiosity what got you on the subject? teal said it great as the heavier flywheel will have more inertia to dissipate.

but when it comes down to flywheel weight there are negatives and positives to both heavy and lightweight flywheels, its all a matter of the application at hand and the driver as to what weight might be the best.

i was just curious as to weather or not you were having a whats better lightweight or heavier flywheel.

What got me on the subject was the negs about lightweight flywheels.

One of them being the fact that the car will slow down quicker when just coasting, with clutch engaged.

And no, it's not a "what's better" question, I know there are pro's and cons to each setup :P.

But lightest it better for N/a, lighter is better for turbo. And stock is shitty for any application. Which is why even the 16ve flywheel is lighter too.

well there really isnt alot of negative aspects of a lightweight flywheel, its all a matter of personal prefrence, i know alot say that the lighter flywheel and a aftermarket clutch can be slightly harder to drive as it revs up faster so you have to be a little tricky with the throttle and the clutch some may say you have to have a little more finesse with a aftermarket clutch flywheel combo, i have had alot of difference clutch flywheel combos but i guess thats why i personally dont see how thats really a factor, when you get used to a aftermarket setup everything else seems to be about the same as far as driveability is concerned.

obviously more personal prefrence is mor the concern, as some people go from stock to super lightweight, then other go from stock to mid lightweight.

Whats better for mpg's on the highway? (florida is mostly flat) I've seen people say both at one point or another, I am starting to think the lighter would be better