dvls-7

Hey guys Im sure this has been asked already.....but I was considering gettin a RB light steel flywheel but a guy at a local shop was kinda advising me not to cuz he says the weight of the stock helps build boost....but my thinkin is the less weight the faster it revs which =s boost.....am i correct in this thinkin or not......do u guys recommend it or not......what kind of difference did u notice......thanks for your input.....

Da Omen....

NZConvertible

He’s correct in theory because a faster revving engine has less time to build boost. But because the engine has reduced rotational inertia, overall performance is improved heaps. This is a highly recommended mod; I had a 10lb steel flywheel on my last rotary and loved it. A 15lb one would be better if you drive in traffic much.

dvls-7

Thanx man....does anyone have any dyno figures or any other documentation of before and after......or is it jus an overall increase in performance that just puts that ear to ear grin on your face......like..... ....

BLUE TII

iTrader: (9)

I really like how my 11# alum. flywheel feels on my 87 TII, faster acceleration in 1st and 2nd plus it is faster to rev when downshifting and alot easier on syncros too.

dvls-7

Thats cool.....I think the one from RB is about 13lbs not sure need to check site......I think i will go ahead and get it......

Snufelupogus

iTrader: (2)

I read somewhere on here that a light weight aluminum flywheel for a fd will give it +50rwhp in first, +20rwhp in 2nd, and decreases throughout the gears. It does this because of the less mass helps the engine rev faster and helps transfer more power to the rear wheels. It also helps with shifting, like auto-xing and twisties and stuff.
But if you have lots o hp already and are draggin, ive been told that its advisable to use the stock flywheel if you already break traction in first and second...
Oh and on the street... its more "advisable" to use a lightweight steel one (like 14-17lbs) because it makes it a bit more difficult to do a standing start

Dar she blows...

NZConvertible

Those figures are crazy talk! You won't see the effects of a lighter flywheel on a dyno.

Bambam7

Not on a 4rth gear pull, like most dyno's - maybe a TINY bit-
But I can totally see a difference in lower gears...
Not like you normally do 1st gear pulls anyways, but on the street it's another story of course.
Just look at it logically- you can't disagree!

RETed

Who is this guy and where is this shop?
I'm coming over there, and I'm going to shoot him myself!

The idiots have no idea how a turbo works...
Turbo produces boost due to engine load.
Lightened flywheel actually helps boost build FASTER due to increased engine load from the less rotational mass...
Don't try to argue with me - I've seen it with my own eyes.&nbsp Boost will typically kick in several hundred RPM's earlier than with the heavier/stock flywheel.&nbsp If you could map the boost levels at every hundred RPM, it's a steeper boost ramp.

Now, before you all go racing to get a lightened flywheel, there is a balance where the flywheel becomes too light for drag racing starts - less rotational interia hurts launching the car from a dead stop - for a turbo, it ends up being a very delicate balancing act.

I recommend the lightened steel flywheel for ALL turbo FC's.&nbsp The difference is significant, and the car is still very streetable and driveable...

The steeper boost ramp is more of a minor thing, as the quicker revving engine is the primary performance gain.



-Ted

dvls-7

Thanx for all the inputs guys.....u guys confirmed it for me im stickin with my original thought of gettin it.....when i do i'll let u guys know.....i'll be the one with the ear to ear grin........