I'm trying to understand the true need for changing the flywheel to a Steel single mass one from the standard DMF when doing something like this phase 4 conversion: ATMR Racing Team

AFAIK the main disadvantage of changing the DMF is that of chatter when you are in neutral and without the clutch pedal depressed (only?).

The main advantage of changing over is a more rapid rise in revs (is that right?).

Is the OEM DMF "weaker" when doing jason/allard-type conversions to the engine?

Is this change essential/should-have/nice-to-have or not-really-needed? I may have to change my clutch later this summer and I want to make it 'bullet-proof' as the yanks say for virtually all and any later mods...

Thanks for any info/advice

Cheers

Bas

DMF makes the vibrations a fair bit less, which is good. I also think it helps keep some vibrations out of the gearbox etc, which is probably not a bad thing either.

Problems are that instead of moving a single mass you are moving two masses instead with a bunch of springs trying to keep them moving roughly at the same speed. The problem there is that if your engine is able to pull the first flywheel so hard there is no spring extention left, you'll get the DMF vibration noises.

That's more to do with torque though rather than power as such.

It really does depend on how far you are going to push it, although Devonmikeyboy has a pretty crazy amount of power and he still has the DMF

Have a look at the construction of a DMF.

LuK | Products | ZMS details

in the old days they just fitted a harmonic balancer to the crankshaft pulley! none if this fancy wancy flywheel jiggery-pokery

Basil - I'll let you know.

I've been told I cannot use a SMF with my current kevlar clutch system - it's meant to work only with the SMF clutch system as well, which is a shame as it's not rated as high torque wise, yet the SMF would be. I'm hoping [fingers crossed smiley] that the work done to my DMF to "match" it to the kevlar clutch system will in some way help it. It's been totally fine with 360 lb/ft for 35000 odd miles.

Thanks for the advice so far guys - the fact that there is something called a torque limiter built into the DMF does not bode well for it.

Anyone running a SMF? Comments on daily life with it?

Cheers

Bas

OK - found out from tdiclub.com - some people have grenaded their DMF's with power upgrades on TDI's - a little noise from a SMF is just noticeable and it's far stronger and lighter, allowing faster revving and less power loss.

Sorted!

I have an aluminium single mass flywheel on my current setup and had a G60 single mass flywheel on the old gearbox.

The advantages are strength and quick reving. Disadvantages are the revs drop quicker too due to the lower inertia. On the 5spd box the noise difference wasn't noticable, however on the 6speed with it's 3 shaft arrangement there is very noticable chatter at idle although it can be tuned out to some extent by altering the idle speed. There is also chatter when there is no load on the engine, e.g. when slowing down with the clutch engaged. Whenever the clutch pedal is depressed the car sounds normal.

Thanks for the info mate - so perhaps a steel SMF is a bit better than an aluminium one? (heavier and stronger)?

hi all,

sorry to bump an old thread but need a bit of advice myself.

My clutch is on it's way out (it's screeching like mad) and so I thought it's time to change it. As well as this, I didn't want to be stung and find it needs a new flywheel too.

So decided to get my mechanic to look into a single mass flywheel and clutch.

He's come back and said he can get an LUK single mass flywheel and clutch kit for