E46Fanatics - View Single Post - Yet another flywheel question!
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Old 12-05-2012, 03:45 PM   #7
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Join Date: Dec 2010
Location: Birmingham, AL, USA
Posts: 2,193
My Ride: E46 ZHP TS2+ Coupe
Originally Posted by Rob Levinson * UUC Motorwerks View Post
Complete understanding of the UUC Stage 2 / M5 clutch conversion package is extremely important here... directly from our website:
Tipping the scales at only 8.5lbs, this aluminum flywheel boasts the best features in its class (high-speed balanced, correct dowel hole, replaceable friction surface, Made In USA quality) , but is designed to use the clutch disk, pressure plate, and throw-out bearing from the 3.6 liter E34 M5. The total weight of the M5 clutch disk and pressure plate combo is greater than that of a stock E46 3-series clutch, so we have reduced the Stage2 flywheel weight to achieve an overall rotating mass that is essentially identical to a typical 11.5lb lightweight flywheel that utilizes a standard E46 clutch.

Driveability of this package is very easy, nothing tricky or special... just more performance! While a 16.9lb flywheel still gives a tiny boost in performance, you're leaving quite a bit on the table by not shaving that additional 5lbs. 5lbs of rotating mass, calculated as moment of inertia, is significant!

To have an understanding of the advantages of reducing rotating mass, please see:


Hope that helps!
My biggest concern is ease of drivability. I'm considering the Gripforce package due to the value over OEM. The only thing that scares me, though, is the issue with engine harmonics being upset and rattling the oil pump nut loose (accessing it to wire it up is a ridiculous job from what I've heard), so I may just go OEM and keep it safe.

On another note, UUC, your SSK (paired with the DSSR) is still as fantastic as the day I installed it.
Originally Posted by Brucifer325 View Post
Thread sucks so bad they moved it to the Feedback Forum.
SPDSKTR is offline   Reply With Quote