The RB is actually 8.5 lbs https://www.nopistons.com/forums/pub...IR#>/smile.png . It's the counterweight that totals the whole thing to 12 lbs. I'm sure it's the same weight as the SP 9lb one. I'd say go with the RB one simply b/c vendors usually sell these with the act ss clutch as a combo... you save only a little $$, but everything counts with these cars.

Unless you are road racing stick with the stock flywheel. It ain't worth all that extra money to get an aluminum one

why do you say that? I noticed a huge difference in my cars performace with the aluminum FW.

Thats what I have heard too! lol.



Twin plate is nice, but it hurts the wallet. Hard petal or soft makes no differance to me.... as long as it can grip. I am going to do the flywheel also. I have heard that the 9lb'er is "fun" to drive, so I will find out in about a week. I thinking of going with the ACT HD PP with the s/s disc. Figure I will need to get the good stuff. Should be going single turbo in 6 months or so. Nothing crazy, 425rwhp or so. That clutch be able to hold it, right?



Thanks for the replies. You guys are awesome.



--Andrew

Centerforce doesn't seam to last on the fd. It also doesn't have those weights that the advertise because the fd has a pull-type clutch. The ss works well for cars making 400 hp or less. Beyond that you'll need the extreme.

It may be *fun* to drive a lightweight flywheel, but for drag racing you want the extra mass of the stock flywheel. Also the aluminum flywheel can warp if you abuse it too much...basically I rather spend the $500 on a water injection setup or something else cool that will make more power

yeah, I didn't read the "go to the drag strip twice a month" part of the original post... I agree that a lightweight flywheel is no good for hard launches.

I have the centerforce currently and do not like it. The pedal is too soft and slips too much during hard launches. I am soon going to go back to an ACT s/s clutch, which I never had any problems with.

I dunno, asfter having a lightweight flyhweel I'd never go back to stock. The car just revs soooo slow! Every time I test drive a customer's car and it has a stock flywheel I'm like %#@%^%^! Can't rev match properly. I've had my M2 9.5 lb for like 3 years now and 35k miles. Just recently I had to replace the friction surface on it.