After weeks of research for a lightweight flywheel and clutch assembly for my 97 Z3 2.8, I've come up with four options. My objective was to obtain a lightweight flywheel with a heavy duty clutch/pressure plate. The OEM clutch/pressure plate is WEAK! Although apparently there's abit of issue with the Sachs Sport clutch kit where it may not disengage properly, not enough clutch pedal travel distance to push the fork thus not disengaging the clutch. Not a good thing especially if one has to remove the transmission twice to resolve this! I've listed all sources through this research below.
1) Go with a lightweight flywheel fitted for the 2.8 and the OEM clutch/pressure plate. Not thrilled with this option due to the fact that the clutch/pressure plate is the weak point. Approximate price: $650+$650=$1300.
2) Go with a lightweight flywheel fitted for the 2.8 and the Sachs Sport clutch/pressure plate with a modification using a 5-series fork but this seems abit of a pseudo/kludge fix. Not a good thing. Approximate price: $650+$250=$900. (Source: Korman & TMS)
3) Conversion to M clutch system with an M lightweight flywheel. The OEM clutch/pressure plate for the M is abit stronger than the 2.8 OEM. Good enough for me. Although the clutch slave hydraulics may have to be changed too. Approximate price: $650+$300+$80=$1030. (Source: Korman & TMS)
So far, I'm leaning toward option #3. It's moderately price and achieves my objective with quality in mind. Has anyone out there tried this? I would be very interested in your opinions. Note that I didn't even consider Dinan due to their extreme price with the sport clutch, unrealistic $2800.
Lightweight Flywheels/Sport Clutch kits for Z3 2.8
Turner Motorsport $699/299 (M version)
E36 M3/ 325 / 328 / Z3 2.8 and 3.2 - Lightweight Flywheel (11 lbs)
TC Kline $585/650 solid disk
Lightweight flywheel (12 lbs) for the E36 M3
all aluminum including friction surface and has a steel ring gear for durability
BMP Design none/none
2.8 version not available today, check back in late 2000
Bavarian Auto $850/none
AFK M52 Z3 2.8 AUTOSPORT FLYWHEEL
Korman Autoworks $869/none*
Lightweight flywheel (10.4 lbs) for MZ3 and Sachs Sport Clutch Kits
E36 M3 (3.0L), 328 (240 mm) P/N 11121890K
HMS Motorsport $???
Lightened Flywheel, machined to reduce weight (13 lbs)
Dinan BMW flywheel&clutch system
Stage 1 Clutch Assembly D550-3603C $1,695
Stage 2 Clutch Assembly D550-3602C $2,768
Bekkers Import $878
Lightweight flywheel (10.5 lbs) for M3, can be used with stock or sport clutch.