Z3 Driveline
Korman Adjustable Short Shift Kit
Let's you select the
shifter throw that suits your needs
All Z3 1.9L and 2.8L P/N 25250001
M Roadster P/N 25250005
Sachs HD Clutch Components
Modified engines, turbos, superchargers, and wider tires place an increased
load on clutch components. Heavier duty assemblies are highly recommended. We use only new
Sachs clutch parts, no rebuilt units. Sachs is the original equipment supplier for BMW,
Mercedes, Porsche, Etc.
Model |
Heavy-Duty Sport Pressure Plates |
Heavy-Duty Sport Discs |
( 20% Increase in clamping force ) |
(H.D. Disc Lining and Springs) |
|
| M Roadster | P/N 2121999698 |
P/N 2121999946 |
Aluminum Flywheels
The factory dual mass flywheel weighs 27.6 lbs. The Korman Aluminum Flywheel weighs just 10.4 lbs. This reduction in rotating mass (17.2 lbs.) allows your engine to accelerate faster at all Rpm's. Our flywheel is precision machined on the latest numerical control lathes to ensure highest possible accuracy. Constructed of high strength heat treated aluminum with a replaceable hardened steel friction surface. Kit includes aluminum flywheel, anti-galling plate, and special flywheel bolts. Unbeatable when combined with our Sachs Sport Clutch Kits (above), and is also compatible with the original factory clutch set.
M Roadster 3.2L P/N 11121892K
Differentials
Korman 75% Limited Slip Differential Conversion
If you race, autocross, rally, do BMW driving schools, or otherwise tend to push your car to the limit, let us convert your 25% limited slip differential to 75% limited slip. Wheel spin is reduced or eliminated, improving track times significantly. Additionally, the reduction in internal slippage lowers lubricant temperatures, helping prolong bearing life. The conversion requires special machining at our facility, making it necessary for you to ship your differential to us for modification.
75% Limited Slip Conversion P/N 33126375
Quaife Automatic Torque-Biasing Limited Slip Units
Already used in Formula 1, IMSA, SCCA and Pro Rally applications,
Quaife Automatic Torque Biasing Limited Slip Units are now available for your BMW. Quaife
units utilize a gear driven mechanical process to direct power at an infinitely variable
rate (as opposed to a fixed 25%, 40% or 75% rate) to the wheel with the most traction.
Unlike the more complicated and fragile Torsen design and the BMW OEM clutch pack limited
slip units which tend to transfer power abruptly, the Quaife units are simple and rugged
in design and provide a very smooth power transfer between the two driven wheels. Quaife
units have proven to make as much a one second per mile difference in lap times on
road courses. We can provide you with the unit for your own installation, or install it
here in our facility. (These units are sold on an outright basis making them an ideal
option for cars which did not come equipped with a limited slip differential from the
factory)
Quaife Unit For 2.8 and M Roadster P/N 33146900
Korman Suggested Differential Gearing
Korman recommended optional gear change ratios for increased acceleration and acceptable RPM per mile.
(please refer to TECH INFO for more information on this upgrade)
| BMW | Stock Gear Ratio | Available Ratios | P/N |
| M Roadster | 3.23 | 3.46 (recommended upgrade) | 33123346 |
| 3.73 | 33123373 | ||
| Z3 4Cyl. | 3.45:1 | 3.64 (recommended upgrade) | 33121364 |
| 3.91 | 33121391 | ||
| 4.10 | 33121410 | ||
| 4.22* | 33124422 | ||
| Z3 4 Cyl. Automatic | 4.44 | 4.75* (recommended upgrade) | 33124475 |
| 5.00* | 33124500 | ||
| 5.85* | 33124585 |
* May require pinion flange change at additional cost
Korman recommends Redline Synthetic Lubricants for your BMW
© Korman Autoworks, Inc. 1997, 1998