E28 Driveline

Korman Adjustable Short Shift Kit

Let's you select the shifter throw that suits your needs

• Adjusts in minutes from inside your car
• Accepts original or aftermarket gearshift knobs
• Assembled unit saves on installation time
• Adjustment locking mechanism
• Replaceable, self-lubricating bushings
• Includes shifter cup bushings and complete instructions
• Easily installs in less than an hour

All E28 9/85>P/N 25250003

All E28 >9/85 P/N 25250004

Lightweight Steel Flywheels

Precision machined and balanced steel flywheel. 35% lighter for reduced inertia and more rapid acceleration. Sold on an exchange basis.

533i, 535i, iS P/N 11220006

528e P/N 11220325

Aluminum Flywheels-528e

Precision machined on the latest numerical control lathes to ensure highest possible accuracy. Constructed of high strength, heat-treated aluminum, with a steel friction surface retained by aircraft structural screws. The insert is stress relieved, blanchard ground, precision drilled, countersunk, and heat-treated. It is far superior to spray-on type friction surfaces and can be replaced when worn. Kit includes aluminum flywheel, flywheel bolts and anti-galling plate. Total flywheel weight is 8.9 lb.

528e(228mm) P/N 11121880K

Flywheel Bolts (always replace flywheel bolts when replacing the flywheel)

528e P/N 11220616143; 533i, 535i, iS P/N 11220616142

Dual Mass Flywheel Conversion-528e

The factory dual mass flywheel weighs 27.6 lbs. Our lightweight conversion weighs just 14.9 lbs. The reduction in weight allows the engine to accelerate faster at all RPM's. Our kit includes lightweight steel flywheel, Sachs H.D. pressure plate, H.D. sport disc and release bearing. Fits all 5/86 and up 528e with dual mass flywheels.

P/N 11221325

Sachs High Performance Clutch Components

We sell only quality SACHS clutch components. Heavy duty pressure plates feature increased clamping force for better performance with high horsepower engines, bigger tires, etc. The heavy duty light weight pressure plates feature the same increase in clamping force but the center plate, normally cast iron, is replaced with lightweight aluminum for even better performance. Heavy Duty Sport Discs feature a performance grade friction surface which is both riveted and bonded for greater strength.

Stock Clutch Kits

All new (no reman) kits include stock pressure plate, disc and release bearing.

533i P/N 21210000004 83-2/84

Transmission

Automatic Transmission Computer Chip 87-88 535i

Raises automatic transmission shift points to match changes in the engine's powerband due to improvements. Firmer shifts also aid acceleration. For electronically controlled transmission models only.

P/N 126535100 (Bosch ECU # 0260002007)

Korman Manual Gearbox Rebuild

See additional information under Rebuilding; Transmissions

2 year/24,000 mile warranty

We rebuild your gearbox using only BMW original parts. Includes new bearings, synchronizers, seals, gaskets and labor.

P/N 232316XX

Differentials

Korman Standard Differential Rebuild

see additional information under Rebuilding:Differentials

2 year/24,000 mile warranty

Differentials with normal wear don't usually require the replacement of the ring and pinion gears. Our standard rebuild includes complete disassembly, through cleaning, close inspection of all parts, replacement of all bearings, seals gaskets, crush sleeve and lock ring. Includes meticulous attention to correct gear lash, gear contact, precise pre-load of bearings and exact torque specifications. We expect our rebuilds to last well over 100,000 miles. Note: UPS can pick up and deliver your differential at your door!

533i, 535i, iS P/N 33126082

528e P/N 33126030

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.

P/N 3314690xx

Optional Ratio Differential Gear Sets

"My first BMW, a 1964 1800 TISA four door sedan regularly beat the performance sport cars of its day in autocrosses: E-Jaguars, Lotus Elans, Corvettes, MG Twin Cams, Porsche Super 90's, and more than a few 911's! Along with very minor engine changes, a good suspension package, wider wheels and tires, and a close ratio gearbox, my most effective "speed secret" was the change to a 4.75 gear set!"

Ray Korman

see related information under TECH INFO: DIFFERENTIAL GEAR CHANGES

Korman Suggested Differential Gearing

*Carrier change required

Other available gear ratios

Call us for recommendations, pricing and more information on upgrading your differential.

© Korman Autoworks, Inc. 1997, 1998