Lightweight fly wheels, yes or no?
 

What are peoples opinions, there seem to be quite a few people about using them and there is a trader on the site that seems to want to sell one to every man and his dog?

For those who may not know the weight of the flywheel is a important one, it is required to keep momentum on the dead stroke and help maintain a smooth engine.

I'm taking road cars, not track.

Most people have them as I kit I.e clutch and flywheel setup.

In my personal experience on a classic I bought a 6 speed uk box and exeedy twin plate clutch and flywheel from Matty br developments.

I had rich at FB tuning fit it.

It felt like I instantly gained 100ftlbs of torque. It was awesome.

I let my dad drive the car after raving about it and within two weeks he went out and bought the same setup.

One of the best mods I did to my Classic.

Is that not down to the new gear box and different ratios ?

Buy one from AS Performance. :) Much cheaper than the seller you're alluding to :) Yes very much worthwhile :)

To me, midrange it feels better but I do feel the car bogs down a little at low revs with the lightweight flywheel.
It took a while to get used to having to use more revs to move off without stalling :)

Lightweight flywheel is one of the best upgrades you can do in my opinion. I have done this to various road & race cars in the past and it's always made a big difference. Well worth the upgrade!

When I finally upgrade my OEM clutch i'll be fitting one to mine! :)

Not as simple a question as OP would like.

There are lightweight and extremely lightweight, for a road car you don't want to go too light. 6.7Kg on mine and it's good, would not want to go under 6Kg in road car IMHO.

4.3 in mine no problem on the road :)

iv got a 6.2 kg one on mine (there circa 12kg standard)

i changed it because i needed a new one anyway so performance FTW!

however i think its a little to light. lightweight fly wheels don't usualy reduce the weight by half! Subaru put a pritty heavy flywheel in the car and now where putting fairly light ones in

my car is jerky now and harder to launch
if i had to do it again and could pick whatever weight i wanted i think id go for about 8.5kg

that said the acceleration in 1st gear is pronominal,

That's nigh on a third less going by what's been mooted for the OE flywheel. Surely you're going to have some negatives going so light. Or is it having your cake and eating it?

Have them in my 6 speed classic and my 202 :) No real negatives tbh. Only observation is the reduced inertia and inceased engine breaking. I used to use my classic daily for work. :) Can't comment on other peoples cars, the quality of their clutches or flywheels or indeed their ability to drive :)

For launching hard every time and throttle less pull offs in stop start slow traffic OEM
For hoonigans, lightweight.

Someone was on about lightweight flywheels reducing engine torque somewhere, might have been here or Facebook can't remember which, by going lightweight. They don't.
However they do reduce the inertia. Imagine being stood still and a fat guy shoulder barged you at 10mph, he'd knock you down, where as if a small child did the same thing they'd struggle to make you move, same kind of thing with flywheels. Basically they store energy.

Horses for courses really

Where's the 'maybe' option?! 😁

I wanted to know this, so this may be of intrest to this thred

https://www.scoobynet.com/general-te...wkeye-sti.html

I'd say that's a very good way of putting it - definitely agree about the moving off etc. I'd imagine torque if reduced would be low down torque.

That thread led to this thread, I know whos side I'm on.

I have some experience of light weight flywheels on bikes but cars not so much but some. My bikes where for racing and wouldn't for one minute recommend for a road bike but cars not so sure.

Taking into account what Alan says in the thread and a friend of mine who is a engineer for Porsche I would not be going out to buy one for a road car. If I needed to replace the flywheel for whatever reason then I would consider maybe a bit lighter but if anything not much.

For me the sign of a good ROAD car build is when someone modifies and improves the cars performance and power still keeping a feel of quality that can match the standard car.

If that means having a crap clutch pedal in traffic then that wouldn't do, sure you can get used to it but not for me.

On the flip side some are saying they prefer a light weight flywheel and thats how the poll looks so who knows...not me :wonder:

Well following good advice have put in a new standard Fly wheel along with a Exedy stadge 1 organic clutch pink box

I have only covered 10 miles taking the car back home so its not run in yet, but I must say it feels great, nice and light and no judder..:)

The way I see it isn't the whole car a flywheel when you are in gear and moving?
Doesn't matter how revy the engine is in neutral, is what happens once you lift the clutch that matters no? Having driven a fwd turbo mk1 golf with a lightweight flywheel, I don't like it. Too on/off and tippy. Plus the reduction in inertia for a fwd car is not required, in fact quite the opposite, you want to reduce wheel spin.
4wd, well that's different I suppose, harder to launch some say? I'm interested because I'm away to be running two flywheels essentially on my impreza, if I notice a massive difference then I will be replacing one with a (very) lightweight one, but for now we will just see what happens

Can you say who gave you the good advice?

No judder is something I expect to be a given, with light weight it seems to be bonus.

Can I ask how much did the kit cost with fitting it as well .
Plus u put a 6 speed gearbox on a classic wow . Did not no that can be done. Is it hard to do . I no u need to by the gearbox witch would be a what year 2001 or somthing like that . Or do they do a 6 box in a classic shape. But was there much work involved in fitting it . I only ask as it would be nice sometimes to have that 6 gear .

I like the way he has done the 6 speed gearbox mate . I like that chris . Nice touch don't you think .

Would a.lightweight fly wheel be ideal for a 2.5 still have the torque to pull away but light er so will rev up faster?? Best of both maybe.

How much does a flywheel weigh . Is it like taking the AC off to make the car weigh less.
Is that the idea of doing the flywheel . Or is there more to it .

Sorted 12kg . That's not that much . But then in racing it all matters . But for a road car is it worth doing . Mmmm
I take it is what ever the owner wants to get from his car .
I would just stick to standard. But that's me.

Need to know was it hard to do a 6 speed box on a classic. And how much did this cost you to do .

Where's the twin flywheel box to tick?

ive had an exedy clutch and lightweight flywheel for years, its a good upgrade and worth doing if changing the clutch, but be careful not to go too light.

Sorry for the late reply I have been away on holiday..

After gathering all the information I was after for my own piece of mind so that I had a little bit more knowledge of what to expect from different set-ups, the garage who has done all the work on my car (Indigo GT) we decided that the Exedy stadge 1 organic clutch pink box would be fine for my needs as there will be no modifications in terms of more BHP in the future

Not all clutches are judder free, so don’t expect that for one minute, with the 2.5 engine putting in a lighted flywheel can sometimes through up fault codes, as I had no problems with the standard flywheel I see no benefit to change it for the way I use my car

My 4 puk does judder somewhat lol

Lol . There's All ways one lol. Like it . U made me giggle