Ok so I just recently put a UUC clutch and flywheel in my car and have been having some issues. I took it back to the shop that installed it and a different tech pulled the tranny out and pulled everything apart and checked it all. We even put in the tranny cocktail that UUC calls for.

That being said here is the issue. When in gear and riding a gear down say from 4k-6k you hear a really loud rattle. Also the car as it gets high in the RPMs starts to have an odd vibration come through it. I also noticed when coasting on the highway if I press the clutch in I can hear the odd rattle at the 4k-6k but not as loud. The car has been feeling slower but this could be attributed to a few codes. One code is for the throttle motor. And Vanos Adaption has popped up also. Any ideas what the noises are?

It's the flywheel... I had the UUC and ended up going back to the OEM because of the 5K rattle and low idle causing the gear rattle. I didn't want to risk the vibrations on the crank.

So its normal. Wow thats pretty crazy.

Normal in the sense that there is nothing wrong with the install. I had my concerns and decided to remove it, but that's just me. Just as a note I hope you have your old flywheel, it cost me 700 for a new one because like a dumb ass I tossed it when I finished the install.

Normal in the sense that there is nothing wrong with the install. I had my concerns and decided to remove it, but that's just me. Just as a note I hope you have your old flywheel, it cost me 700 for a new one because like a dumb ass I tossed it when I finished the install.

S#it...

I've been running mine for a while now 18 months or so with no real issues other than the noise....

It really does sound like somethings broken, above and beyond the 'chatter' usually associated with a LTW flywheel but I'm not getting a vibration just the noise.

But it just rev's so damn fast...

My stock one has been sitting behind my shed and is covered in rust.... crap...

Yeah my stock one is somewhere in a warehouse or something i dunno.

I have a UUC flywheel and stage II clutch. As others have said, it makes a TON of noise (and not just noise at idle, I expected that) and has more vibration. Noise when decelerating before a corner is particularly annoying. Lots of gear rattle at idle.

The upside is the ease of revving, and it may be slightly faster in the quarter mile.

Definitely a mixed bag.

If I had it to do over, I would probably not. I may put the stock flywheel back on when it's time for another clutch.

Noise when decelerating? Not a flywheel noise.

Keep in mind that a flywheel itself has no moving parts - it's a disk of metal. The clutch is the same design of clutch as used in every car.

If you're having vibration, there are a handful of things that can cause this:

1) Over-tightened or pre-loaded transmission mount bushings.

2) Improperly torqued or improper procedure (wrong pattern) for crank bolts and pressure plate bolts.

3) Clutch assembly out of balance - a clutch disk is suspended within the pressure plate by a set of three drive strap/springs. It is possible that, if dropped during shippping, the assembly will shift internally and cause an imbalance.

If you're having weird noises, check:

1) Under-car aluminum heat shields and exhaust system, make sure nothing was bent or mis-aligned during re-assembly that would cause contact between parts. As the exhaust system shifts during acceleration/deceleration, and changes dimensions when heated, this may not be easy to see.

2) Pilot bearing - should be replaced depending on mileage of car, and can also be damaged during clutch installation.


It's very difficult for us to diagnose these things remotely without seeing or hearing the car. But what I can tell you is that a proper installation results in no weird vibrations or noises other than the possibility of neutral-only gearbox rattle.

I don't know what would cause the noise when decelerating. It sounds like a more intense form of gear rattle. Of course a flywheel in and of itself isn't going to cause noise but can certainly introduce noise, resonances and vibrations into the system via the reduction of rotating mass.

As for install, the shop that did the install is very competent and in fact had to do the install twice as the first clutch pressure plate delivered was slightly warped. Perhaps dropped during shipping? Who knows. The whole install was done twice -- same flywheel both times, but a new pressure plate the second time.

I have no doubt (especially during the second install) the installation was meticulous.

Given several of us seem to have similar experience spread across multiple shops/regions/cars, it is unlikely improper installation is the issue. Whether or not the issues are the same I don't know, but the prior poster's descriptions sound very similar.

Rob I am Peter that called you and talked to you about it a few times if you remember. I noticed the weird vibration comes in from 4k-6k and so does the noise. The boxes were perfect when they were delivered so I dont know whats up. They also replaced the pilot bearing the second time they pulled it out. What should the tranny mounts be torqued to?

Mine makes the same sounds as well as an extremely loud chirping/grinding sound when engaging the clutch smoothly, basicly while the clutch is slipping, even at speeds as low as 1k rpm. My boxes were fine as well, and my setup was installed twice because it was shipped with faulty flywheel bolts the first time and they had to be replaced. It has made noise for thousands of miles now and the only way to make it go away is to avoid slipping the clutch, as in dropping the clutch everywhere you go which is not a great fix. I have the cerametallic E34 M5 clutch and red tranny mounts.

Rob I am Peter that called you and talked to you about it a few times if you remember. I noticed the weird vibration comes in from 4k-6k and so does the noise. The boxes were perfect when they were delivered so I dont know whats up. They also replaced the pilot bearing the second time they pulled it out. What should the tranny mounts be torqued to?

Transmission mount torque is a standard 16lb-ft. Over-tightening them definitely will cause vibration.

Which transmission mounts do you have? With either red urethane variety, you should expect there to be at least a little vibration - that is a competition product and not designed with street comfort in mind.

- Rob

Mine makes the same sounds as well as an extremely loud chirping/grinding sound when engaging the clutch smoothly, basicly while the clutch is slipping, even at speeds as low as 1k rpm. My boxes were fine as well, and my setup was installed twice because it was shipped with faulty flywheel bolts the first time and they had to be replaced. It has made noise for thousands of miles now and the only way to make it go away is to avoid slipping the clutch, as in dropping the clutch everywhere you go which is not a great fix. I have the cerametallic E34 M5 clutch and red tranny mounts.

Let me make one thing perfectly clear; competition parts often do require an alteration of your driving style. The CeraMetallic clutch falls into this category, and will require a different engagement technique with less slipping. Engagement at 1K rpm? Stop doing that! :D Slightly more gas and slightly quicker realease is all you need to do. Your 1st gear engagement will still be smooth/streetable and you will not have any noise. Slipping a competition clutch excessively is bad for it's lifespan.

- Rob

The tranny bolts were torqued to 16ft/lbs and I have stock tranny mounts.

The tranny bolts were torqued to 16ft/lbs and I have stock tranny mounts.

The noise you're describing is not normal at all, and cannot be a sound that the flywheel or clutch makes.

I did hear a sound that fits your description on a used 6-speed installed in a car... with the OE flywheel/clutch, it made the noise. We changed to one of our flywheel setups, the noise remained. We were thinking bad input bearing on that gearbox.

- Rob