I'm planning to get a new flywheel and I was wondering if I should go with a 8lb flywheel or a 12lb flywheel? I'm going with the ACT one and going all motor if that helps.

 

My immediate response to you is the 8lb. Flywheel and that response is completely physics based. Think, Less weight creates less rotating mass, which ultimatly creates faster revs.

I will probebly be proven wrong though.

-Brian

 

It depends solely on what you're willing to give up.

As with anything, that less rotational mass also affects the drivability of the car.
Your car will rev up and accelerate much faster, however it will also therefore slow down much faster as well because of the massive loss of the flywheel's moment of inertia. This means that it will be much easier to stall the car at stoplights, will take higher revs to shift and necetate much faster shifts as well.

 

8lb is nice

 

I have a related question. I am going to end up getting a new clutch and fly wheel. What is the best combination/setup to get?

 

IMO, if you rev match your downshifts or if you're going to be tracking (road course/auto x), then get the lighter one.

If you're only worried about 1/4, plan on going turbo and/or never match your revs when you shift, then get the heavier one.

FWIW, I have an ACT XTSS with a Fidenza (8.8lbs). When you shift, you do have to step on the gas a little before you let off the clutch (unless you're absolutely gunning in and shifting really quickly) as the flywheel loses momentum quickly and you have to be more precise with the engagement point to prevent your passengers from jerking around.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by somboa &raquo;</TD></TR><TR><TD CLASS="quote">IMO, if you rev match your downshifts or if you're going to be tracking (road course/auto x), then get the lighter one.</TD></TR></TABLE>

You can actually rev-match easier with a stock flywheel
so I don't see how a lighter one would benefit you more
in situations like rev-matching

 

Get the 8lbs flywheel.

You will not sacrifice any drivability; sure, there's a short period of adj., but it's nothing staggering.

I've had my 8lbs. Fidanza for the last 2 yrs./60,ooo miles and I have zero complaints.

 

no loss in drivibility.
had my fidanza flywheel for a few months now and i admit on the first day i stalled maybe 3 times driving home with it
ever sine then...never had a problem with it...drives like it used to except the revs jump up faster...also when i want my car to slow down when downshifting, it doesn't even slow the car down enough sometimes but it's better then the stock one
i vote for 8lbs!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SKDRCR &raquo;</TD></TR><TR><TD CLASS="quote">You can actually rev-match easier with a stock flywheel
so I don't see how a lighter one would benefit you more
in situations like rev-matching </TD></TR></TABLE>

Technically yes, but I find that it's easier to "blip" the throttle 2-4k revs with the lighter flywheel than with the stock one. I almost have to step on the throttle with the stock one as it's not as sensitive.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SKDRCR &raquo;</TD></TR><TR><TD CLASS="quote">

You can actually rev-match easier with a stock flywheel
so I don't see how a lighter one would benefit you more
in situations like rev-matching

</TD></TR></TABLE>


Whatever it is that you're doing, must be something other than rev-matching, becuase I have yet to meet anyone how had an easier time revmatching/heeltoe-ing w/ a stock 19 lbs flywheel v. an 8 lbs. Al unit. This is true in cars, motorcycles, etc.

The less inertia you have to spin off the end of the crank, the more responsive the engine will be to throttle input.





Modified by bb6h22a at 2:44 PM 9/15/2004

 

I don't want to hijack this post, but it is related. In an H22 civic (stock motor), is it worth going to an 8 Lb. flywheel? How much gain do you see in acceleration? Does it make traction worse from a dead stop?

Thanks and I appreciate the input.

 

i honestly think 8lbs is to light. go for something in the 10-12 lbs range.

At least with city driving stop/go traffic that sort of thing, why would you want something that is going to create a problem for you? sure you may accelrate faster, but in traffic does that really matter? I will end up with the Jun or ACT chromolly flywheel. but thats just my opnion.

 

Yeah, I was thinking 11 or 12 Lbs. would be good. An improvement without giving up too much. I think a stock H22 flywheel is about 19 Lbs. but I'm not 100% sure on that.

 

its gonna be a bitch to drive. just make sure that ur never lazy or tired when you drive your car. when u first get it, ur either gonna stall or rev too high to keep it from stalling. i have a light flywheel as well and i enjoy how it revs faster, but im tired and lazy half the time i am driving my car..so iono..its up to u...tradeoffs.

 

i have the clutchmasters 12.2 lb flywheel and its just right.

 

lighter flywheels will revmatch better than heavier ones period. for example you wanna down from 5th to 3rd, how long will it take u to blip the revs high enough to grab 3rd with a light wheel as opposed to a heavy stock wheel? I'd probably be done downshifting, by the time u get ur stock flywheel up to rev, =P

 

I have the ACT 8lb flywheel, and I just got it about 600 miles ago and I love it.

 

I got a fidanza 8lb flywheel. I love it. I have a Cm 4 puck (got it for 150 brand new) clutch too. I drive my car in traffic all the time. It takes some getting used to but now i have no problems. The thing you will do at first is give it gas to go and then you will let go of the clutch and the revs will fall to quickly and you will stall.It does seem a little harder to stay in vtec from 1st to 2nd. But if your a good driver you wont have a problem.

 

i got the 12lb cuz i thought the 12 would cause the rpms to drop too quickly, now i wish i had gotten the 8lb, btw setup is exedy stage 1 w/ act 12lb fw, i think ive put like 5000 miles on it and it works beautifully

 

With the 8lb i have to shift fast all the time. If i dont the rpms fall way low and it wears the clutch.

 

I don't see that much of a problem keeping it in vtec from 1st to 2nd with my 8lb

 

Its not a problem im just saying compared to stock its harder to keep in vtec. Like before the flywheel i could shift slow and still stay in vtec now i gotta shift very quick. Also with the 8lb you will love how your car will decelarate.

 

built Ls/Vtec w. 8lbs. of boost on t3/t4, i run the Fidanza 8 lb and could really tell the gains after installing the lighter fly never will go back to stock !!! especially after having the feeling running on a built RUSTangs !! and waiting for them to pull back up next to me at the light so i can laugh at them... fidanza

 

I got a fidanza 8lb with an exedy organic clutch - great streetable setup. Shifting is much smoother, revs don't fall too fast, sometimes I still think they fall too slow when I'm taking it easy. Only thing that took a bit of getting used to was slipping the clutch more when starting up hill, but a fter a few tries its no problem.

Only complaint I have with this setup is the chatter when cold. Once the car warms up its as smooth as butter.