Me and a couple friends have been having this argument for a couple weeks and I thought I'd see what you guys say. I would have asked this on H-T but I want to be proven RIGHT.

 

Heavy, more load. your welcome

 

Wouldn't the lighter make it boost faster but come time to shift it's gonna fall out of boost if you don't shift fast enough unlike the heavier flywheel will keep the momentum of the engine going and not drop down thus still keeping it in boost? I dunno I'm just some dumb injen :1

 

Lighter will rev up more quickly. Revs = exhaust gas. Exhaust gas = spool. You could theoretically spool a turbo on lower amounts of exhaust gas, though over a longer time. So with a heavy flywheel you will may get it to spool at a lower RPM.

Don't matter though, a heavy flywheel is absorbing more energy in the system than a lighter flywheel (dutring acceleration), so the lighter will always result in higher WHP during engine acceleration.

As for the issue with boost falling during shifts, if you upshift so slowly that the rev's drop far enough that when you dump the clutch they pick up again you have some major problems with your driving style.

 

that's for damn sure. I'm one of the quickest shifters in my group of people, people say my car sounds like i shift quick like an F1 car

but I would think a lighter flywheel will result in higher power and better acceleration, regardless of boost. it's kind of like asking which is better, a cold air intake or an header back exhaust :1 both will make it better

 

Yeah I gotchya but we're not making a buying decision, just a hypothecial debate on the flywheel weight and which will make boost first.

 

How are you figuring which is first I would think the heavier flywheel would create more boost at lower rpms but the lighter one may hit boost quicker over the same period of time at a higher rpm...I don't know I'm not a fan of light fly wheels for some reason

 

Sorry when I say "first" I mean at a lower RPM

 

Lighter.That is my guess but maybe wait till JD hits this thread he will probably be able to completly discuss all the physics behind etc.

 

Lighter will just rev faster. I thought I heard that heavy flywheels are better for turbo though cause they allow you to stay in boost longer ?