M3, M4, M2C KEYED CRANK HUB KIT - S55/N55/N54 (Designed by Maximum PSI)

Maximum PSI
Engine Tuning Engine Tuning

Engine *

The keyed crank hub kit includes the:

- Keyed hub

- OEM Crank Bolt

- Specialty Drill Bit

- Drill Template

- Drill Fixture Bolt

The gasket/hardware kit includes OE and OEM gaskets and hardware needed to perform the install.  It does not include fluids or any additional service tools.

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

We are proud to release our keyed crank hub kit for the S55, N55, and N54 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. Maximum PSI decided to recently discontinue selling the product, however, the product is still produced the exact same way by the same manufacturer. Maximum PSI and Kies Motorsports assume no liability by using the product and the product is sold as off-road and racing use only. 



Domestic Shipping Policy

All domestic orders will be shipped to the verified billing address associated with the customer’s credit card. In the event that the products need to be shipped to another address, Kies Motorsports will verify the transaction with the customer by requesting a screenshot of our transaction on the customers online banking. Similar to how PayPal verifies orders, Kies Motorsports has implemented an authorization program that will display a unique code on the credit card transaction next to where the “Kiesmotorsports” name appears.

International Customer Policy

To best serve International Customers, Kies Motorsports only accepts PayPal VERIFIED payments and PayPal VERIFIED addresses on international orders. For international shipping quotes, please email us at info@kiesmotorsports.com

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M3, M4, M2C KEYED CRANK HUB KIT - S55/N55/N54 (Designed by Maximum PSI)
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