Lightened Flywheels

[XrSiSt]

I'm looking at getting a HD clutch installed as mine is dead,

anyone recommend sticking in a lighten flywheel?

I know it doesn't do any kw increase but does do acceleration

increase. Would the difference be seen between one with /

one without the lightened flywheel.

Or should it only be put in after a certain amount of hp?

In other words, my question is really how does it compared

for:

$$$ vs Value???

[PranK]

if you have the $$$ spare then do it, but a lightened flywheel isn't on my 'to do' list.

Just get the flywheel machined when the clutch goes in - thats what i did..

Christian.

[Silver-Arrowz]

I had a lightened flywheel in my WRX and yes acceleration does improve. But, it's a real pain to drive around the city. You lose out on bottom end torque.

Very good if you get it out on the track cause you can keep the revs up easily.

[Guest Krystian]

Yeah, Prank's right.

You definately get a good response in the acceleration department.

Light flywheels aren't that good for city driving, or driving in the wet for that matter. The accelerator becomes a lot more "touchy" and unless you have perfect control you can lose it easliy around a corner.

In other words, if you drive it every day then it's not a good idea, if you just take it out to give it a little squirt now and then, then go for it.

[JiMb0]

Whats a flywheel ?

[XrSiSt]

Thanks guys.. Just didn't know anyone who had one

to tell me the differences. :lol:

Jimbo..

I'm not 100% sure, but this is my uinderstanding.

Your clutch is connected to your axles and diffs.

The flywheels is a rotating part from your engine,

which looks like a really big disc.

By letting go the clutch, you make these two join

together hence turning the axles to make the car

move.

I hope that explains it.

More than happy if someone corrects me for any

wrong info there. :oops:

[JiMb0]

Sing with me now ....

Youuuurr clutch is connected to your ax-el

Yourrr axel is connected to your di-ff

Yourrr diff is connected to your shin bone ....

oh ... wait a second, that last bit only occurs after a crash at high speed, my mistake ...

Carry on ...

[rev210]

Hands up who knew I'd post about this one.

Light flywheel is a good thing for an engine like the skyline's.

The revs build faster, boost comes on faster Hello! are we all not driving turbo cars here?

Driving around the street, RB engines have plenty of spare torque unlike the 4 pot WRX, WRX's have rather short ratio rear ends to make matters worse.

There is often no loss of torque with well made light flywheels, JUN/HKS and Ogura are all very good at keeping the torque. What you will notice is the excellent engine braking effect (revs drop quicker off throttle) and reduced strain on gear box.

If you like 400m or track the light flywheel is great and WILL drop the times. Go lighter for 400m and super light for track work.

I've been around quite a number of cars with light flywheels and they are a real "sleeper" mod. You won't be dissapointed. :mrgreen:

[rev210]

Stock or modified its a good idea, doesn't matter how much/little power you have.

The $$$$ vs go go is very good indeed.

[Dr_Drift]

Got mine lightened a fair bit and it made a big difference

When people talk about loosing torque this is true, but only when taking off and flat changing. Your flywheel is basically a large lump of metal that spins with the motor, like anything, if it's lighter it requires less energy to change it's rotation speed, both acceleration and decelaration.

OK: That's all well and good but what's it mean? I found when taking off easy at lights the engine required slightly more throttle to prevent stalling. That is a minor, and in my opinion only, draw back.

The upside is your motor will be MUCH more responsive and have much more sensitive throttle feel.

It was a big help for drifting ;o)

[rev210]

Got mine lightened a fair bit and it made a big difference

When people talk about loosing torque this is true, but only when taking off and flat changing. Your flywheel is basically a large lump of metal that spins with the motor, like anything, if it's lighter it requires less energy to change it's rotation speed, both acceleration and decelaration.

OK: That's all well and good but what's it mean? I found when taking off easy at lights the engine required slightly more throttle to prevent stalling. That is a minor, and in my opinion only, draw back.

The upside is your motor will be MUCH more responsive and have much more sensitive throttle feel.

It was a big help for drifting ;o)[/quote:038c9b3a6f]

Dude I hope you didn't go and lighten the stock flywheel.

The skyline RB ones are cast iron and like all cast iron the outer skin is the only part thats strong, not to mention the fact that you can't get the weight down very much vs a lighter steel alloy. I'd understand losing torque if you go down this road as the aftermarket units have less rotating mass on the outer edge to acheive the benifits as opposed to a lightened cast one that has an even facing.

Maybe you meant an aftermarket flywheel though, cause otherwise you are driving a bit of a handgrenade is its a cast iron job.

[XrSiSt]

ahh.. so many mods.. so little time... :twisted:

[rev210]

ahh.. so many mods.. so little time... :twisted:[/quote:4583aaaad0]

Unique auto sports has got a cheap light steel alloy flywheel $450 i think.

5.8kg as opposed to 9/10kg on the stock one.

Or our favortite taki kaira web site flogs the ogura flywheel for about $650 inc freight it weighs only 4.8kgs.

[adam 32]

im in the process of replacing my clutch, i personally am not going to replace with a lightened flywheel, just machine it

mainly due to the money factor...

[adam 32]

just read your pose there rev

im gettin my flywheel machined to smooth it out not to lighten it, when you say the cast iron outer is the only strong part, how thick is this outer layer

ie how far can you machine it without taking away from its strength...

[YO880]

i was reading a post on some BMW forum and they apparently can't lighten both the Under drive pulley and the flywheel, something about a harmonic balancer.... (what a bunch of whingers )

is this okay for our engines?

[rev210]

Originally posted by adam 32

just read your pose there rev

im gettin my flywheel machined to smooth it out not to lighten it, when you say the cast iron outer is the only strong part, how thick is this outer layer

ie how far can you machine it without taking away from its strength...

They will just 'face' your flywheel, normally they don't take much off. Let them you know you don't wan't it lightened (as in take off kilo's). Don't worry this is not the same as lightening it.

[adam 32]

yeh i told em that and they said they were just taking a very thin layer off and wont affect strength at all

so its all good! thanks rev