Boost luver

iTrader: (3)

As above would it be worth me getting 1 over the original? The car is a version 4 sti
What are the "true" benifits

Cheers

midnight

iTrader: (10)

I personally would consider doing it if you are thinking of changing your clutch as well.It is quite a big job and to just change the flywheel on its own ,when you may have to change the clutch at a later date,makes more sense to kill 2 birds with 1 stone imho.The benefits are better throttle response as less inertia on the engine.I have also noticed when you rev your car at idle it drops down to tickover rpm a lot sooner than with std flywheel due to less drag on the engine.

Davey96wrx

iTrader: (1)

There will be a gain in acceleration, the gains depreciate with every gear change ie you will notice it 100% in 1st, 75% in 2nd, etc etc

If you run a very short ratio gearbox where there is not much step down in revs between gear changes like on an sti type r gearbox you will notice it more,whereas on a wide ratio uk box you'll feel the benefit in 1 st maybe 2nd and not notice the increase after this.

midnight

iTrader: (10)

I noticed it when I fitted it to my uk turbo , had the car 2yrs and never hit the rev limiter. Fitted roger Clarke supa light flywheel( which weighs less than half the weight of the oe unit) & hit limiter twice in 2nd gear when accelerating hard.Car feels much more responsive imho.

Boost luver

iTrader: (3)

Cheers guys what does the oem flywheel weigh? Iv just got a 6kg flywheel don't no of this is much lighter than standard

53

iTrader: (41)

12kg or there abouts IIRC...love mine at 4.3kg and a 6.7kg

midnight

iTrader: (10)

Std flywheel on a classic weighs 10.5 kgs ,so a 6kg one is still gonna make a big difference .The RCM unit I bought is billet steel and like 53's weighs in at 4.35 kgs.

Boost luver

iTrader: (3)

Do the lightened flywheels give idle issues as well, I'm sure iv read they do in some thred??

midnight

iTrader: (10)

Don't believe all you read on the Internet , unless it's from seasoned campaigners who know a bit about Subaru s . Roger Clarke , scooby clinic , Andy Forrest , etc all know a fair bit about these cars.
As I posted earlier a lightened flywheel Helps to reduce the rotational mass that the engine is required to turn - less drag on the engine People have had problems when skimming flywheels , but not with proper well manufactured items as far as I am aware.

Boost luver

iTrader: (3)

Cheers mate
I was trying to think how it could have a affect only thing i could think of is like you say someone who has had a oem wheel badly skimmed/lightened and its off balance

RICHARD J

iTrader: (4)

It makes a noticeable difference to acceleration. I fitted a RCM pulley set at the same time & was more than happy with the results.

ianbott

I believe they can make pulling away a little more tricky as the car no longer has the same momentum from the flywheel but thats just what i was told when asking the same question.

RICHARD J

iTrader: (4)

Not really more tricky, but a few more revs are required, but this becomes second nature after a day or two.

midnight

iTrader: (10)

To true ,especially when you have a paddle clutch fitted as well .

JohnD

iTrader: (5)

Other than the possibility of some clutch judder as mentioned, there must be other downsides to this? eg rough idle, less low speed flexibility etc

JohnD

midnight

iTrader: (10)

Why would that be , as they say the proof of the pudding is in the eating & my car shows no signs of the things you have mentioned. If anything when I rev it up on tickover and take my foot off the gas it drops back to idle speed quicker and idles perfectly .

Sti Addict

I have a light weight flywheel too, car is much faster when overtaking on the motorway, no ill effects either.

JohnD

iTrader: (5)

Does it not make you wonder why Subaru install such a heavy flywheel in the first place as less metal = cheaper!
Dropping back to idle quicker is of course, to be expected as there is less inertia. I suggested a rougher idle as there is less damping of the firing pulses which would be more noticable at low engine speeds. (remember the reasoning for dual mass flywheels on diesels?)

JohnD