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Light Weight Flywheel
Mounting bolts and enforment plate for keep the bolts from digging into the aluminum.

Above & below are photos of the flywheel.  Note the ability to replace the ring gear or the steel wear plate.
Close-up view of servicable bolts to remove gear ring.  Note the gear is bolted into place and NOT swedged into place. 
HMS Motorsports
Photos of stock flywheel
Thoughts on the flywheel:

Once I took my car on the road, it felt like it was lighter, yea I know I could not "feel" that the car was lighter; it just felt lighter.  Immediately I noticed that the flywheel spools up very quickly after 1,500 rpm to 2,000 rpm.  It also spools down very quickly too.  I contribute this to the lighter weight.  With the stock flywheel the built up inertia keep the flywheel spinning a few seconds after you have let off the accelerator.  With the new flywheel, you can better control your speed entering, during and exiting a turn or straightaway.  As for gear noise, YES, you do have increase gear engagement noise, but only during startup.  I did not notice any additional noise during normal running.  This too is due to the heavier stock unit.  The stock unit's heavier mass reduces if not eliminates gear noise.

As to stalling issues, I have not had any stalling since I have had the flywheel installed.  It has been a great experience owning this and I would do it again.



Photo by N.Fong (Z3POWER.NET)
THE FACTS:
The 2000 model year Z3's flywheel was manufactured differently than earlier models.  According to HMS, TC-Kline & Tuner the reason was to accomondate the new Dual Vanos engines, though I can not see why BMW would need to do such a thing.  Anyways, below are the pictures of my new lightweight flywheel and my old stocker unit.

Purchased from HMS Motorsports (thanks to Paulo)

LIGHT WEIGHT Version
Flywheel Weight:  9.89 lbs.
Mounting Hardware Weight:  1.1 lbs.
Total Weight: 10.99 lbs.

STOCK Unit
Flywheel Weight:  23.9 lbs.
Mounting Hardware Weight:  0.9 lbs.
Total Weight: 24.8 lbs.

Weight Savings:  13.81 lbs.

Cost for new Flywheel:  $730 (includes shipping)
Installation:  $ 450  Includes a Lever, Crank Seal & Throw-out Bearing

Installation conducted by CARR Industries, Inc.  Greensboro, North Carolina
Thanks to Thomas Carr and Greg Lavalle  =: )
Photo by N.Fong (Z3POWER.NET)
Photo by N.Fong (Z3POWER.NET)
Photo by N.Fong (Z3POWER.NET)
Photo by N.Fong (Z3POWER.NET)
Photo by N.Fong (Z3POWER.NET)
Photo by N.Fong (Z3POWER.NET)
Photo by N.Fong (Z3POWER.NET)
Photo by N.Fong (Z3POWER.NET)