M3, M4, M2C 4 PIN KEYED CRANK HUB KIT V2 - S55/N55 (Originally designed by Maximum PSI) [UPDATED]

NOTE: WE NOW HAVE THE UPDATED AND IMPROVED VERSION OF THE CRANK HUB WHICH CONTAINS 4 PINS (N55 & S55 ONLY) INSTEAD OF THE ORIGINAL 2 PIN DESIGN

The keyed crank hub kit includes the:

- 4 Pin V2 Keyed Hub
- Specialty Drill Bit
- Drill Template
- Drill Fixture Bolt

Quoted from Maximum PSI, the designer of this crank hub solution (V1):

We are proud to release our keyed crank hub kit for the S55 and N55 BMW motors. This keyed solution eliminates the friction washer design that BMW used to affix the crank hub, timing gear, and oil pump gear to the end of the crankshaft.

The original flawed design allows the timing gear to spin independently from the crank, especially when the motor is modified. Best case scenario the motor needs to be re-timed with new components. Worst case, the valves contact the pistons requiring a complete overhaul. Common symptoms are rough running and camshaft angle deviation faults. We had this issue several times on our shop F80 M3, one of which required valve replacement.  At that point we had this solution machined, and we installed it in our car and a few other test cars last year. We went from a failure at each event to setting new records at the track and on the dyno. We have now achieved a best 1/4 mile time of 9.35@151mph, and we just recently made 899whp/805tq on our Dynojet on E85 fuel. We have two other cars that have made over 1150whp.

Please note, this is the crank hub that was designed by, manufactured for, and formerly sold by Maximum PSI, now updated. Kies Motorsports assume no liability by using the product and the product is sold as off-road and racing use only.