LTW flywheel no longer chatters... Eurosport pulleys involved?

[Krank]

So half a year ago, I got a Fidanza LTW flywheel with Sachs clutch when my stock clutch started slipping. At the same time, I had Eurosport underdrive pulleys installed. I've always had this strange grinding-ish noise on deceleration past ~3k rpm that I never had before, but that's another issue. I had read in another recent thread that having a LTW FW and aftermarket pulleys together was a bad combination? My flywheel no longer chatters like it used to, at all, which is something that I'd never heard of before. I was curious if something got tweaked because of the combination and my flywheel isn't 100% right?

Thanks guys.

[siggyfreud]

As far as I know its a badcombination because you loose both of your harmonic dampeners by going with a lightened flywheel AND lightened crankpulley. Wont take long to rattle the engine apart at this point.

[Stück]

He does not have a lightened/removed crankshaft pulley harmonic dampener.

[savage217]

Not really sure, alot of people run lightweight flywheels with underdrive pulleys. Im sure they have a little rougher idle compared to stock but I dont remember reading anything about rubbing.

[fsmtnbiker]

The crank pulley + lwfw is what you want to stay away from. UDP's + LWFW is no problem.

[(V)3]

The crank pulley + lwfw is what you want to stay away from. UDP's + LWFW is no problem.

+1 si

[chadd95m3]

I have the underdirve pullies and am putting a LTWFW, are you gouys saying that's a bad idea? Are the underdrive pullies the same as a lightened crankshat pully?

Thanks,

[Daved]

I have the underdirve pullies and am putting a LTWFW, are you gouys saying that's a bad idea? Are the underdrive pullies the same as a lightened crankshat pully?

Thanks,
It's not a problem if you're not going to underdrive the crank pulley.

[skratch]

questions for some that have added the pullies after the ltw.Did the engine have rough spots from idle to 1.2k and then again @ like 2k ish?

I can remember my engine being very smooth from idle to redline but I did the pullies and the flywheel at the same time so I dont know if the pullies added any vibrations.

also did a few other suspention mods so IM sure they all added up.

If I can get my car smoother with going back to the old pullies I might do that.2hp is not worth the chatter my car makes

My car is very senetive to chatter and I think the pullies have made it worse.If I open the door or turn on the lights,basically any load on the alteranter will make it chatter at idle and turning the AC on makes my car sound like a disel lol

[(V)3]

the crank shaft pulley drives other/aux. pulleys (alternator, water pump, a/c).

the harmonic dampener is in the crank shaft pulley. removing the harmonic dampener is bad (especially on an inline engine). on a v engine, maybe ok.

lightweight flywheel = :alright

lightweight flywheel w/ underdriven aux. pulleys = :buttrock

lightweight flywheel w/ underdriven crankshaft pulley = :cashwalle :bawling

[Krank]

Thanks for the comments guys. I knew you couldn't pair up a LTW flywheel with a crank pulley but I recently heard a LTW FW was also bad with underdriven aux. pulleys. Apparently, that's not the case.

But I'm still curious why my LTW flywheel doesn't chatter anymore? Zero chatter.

[jamesclay]

Weather is cold so you don't have the AC on?
Weather is cold so trans fluid is thicker and damps chatter?
Clutch bedded in differently now?

[cpcalkins]

I have the same setup... (Fidanza Flywheel with Eurosport Pulleys) and it rattles and makes noise too. I have been trying to rectify the problem with possibly running a sprung hub clutch but i cant figure out what sprung hub clutch to run...

Does anyone know if this will cause any long term damage or will it just be noisier???

[jamesclay]

Just noise and you can reduce it by running a heavier trans fluid or bumping the idle RPM with software. We do have a spring hub clutch that fits the flywheel you own for about $600 - Clutchmasters performance clutch.

[cpcalkins]

Just noise and you can reduce it by running a heavier trans fluid or bumping the idle RPM with software. We do have a spring hub clutch that fits the flywheel you own for about $600 - Clutchmasters performance clutch.


will the spring hub clutch help quiet it down???