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

Maximum PSI
$1,299.00 $1,199.00



maxpsi s55 n55 n54 crank hub kit v2 whats included

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.

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We are typically very quick and have a 24-48 hour turnaround time (this applies to products we have readily available at the warehouse and not a product that requires special order). Transit time depends on your order and which warehouse we are shipping from, but typical transit times are between 5-7 business days from one side of the US to the other. Larger items like bumpers and body kit conversions can take up to 10 business days to get you from time of ship.

Majority of the items we offer do ship free to the lower contiguous 48 states. States that require plane or boat to reach (such as Hawaii, Alaska, Puerto Rico, etc) do NOT qualify for free shipping. Larger items such as bumpers, hoods, fenders, also do NOT qualify for free shipping. Please contact us to inquire about international shipping costs. During checkout, you will know which items ship free and which have shipping costs associated with them. In general, larger/heavier items will have additional shipping costs (body kits, wheels/rims, etc)

Even though everything can be shipped internationally, sometimes the cost is simply just too high and doesn't make sense to do so. We're here to make sure you have a great shopping experience, so if you have a product(s) you want to inquire about, please contact us at

Yes, we do price match reputable competitors in the marketplace. If you find a product cheaper elsewhere, please email us the (1) link of the product from our website and (2) the link to the competitor site. We will make an assessment on our end if we are able to price match or not and respond to you via email.

Typically you have 14 days to return a product you purchase when you change your mind. Damaged and improperly installed products are NOT eligible for returns. Shipping fees may be assessed and not refunded based on criteria as well as restocking fees. Please see our FAQ page for more details.

Unfortunate Kies Motorsports no longer does customer installs. Our HQ is solely reserved for filming, office space, and shipping/receiving.

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