Illsic_Design
Well-Known Member
VTT I believe has a newly designed aftermarket crank hub bolt/other pieces that don't require removal of engine/drilling a pin or any of that and from the design looks like it will prevent the issue from happening.depending on the official starting power figure and your plans for future tuning etc. I may re-think that decision. There is no doubt the M2 Competition is an amazing car.....some journalists are picking it over the 718 Cayman....but you have to remember adding power is WAY easier than removing weight. Also if you plan to bump the power up on the M2 you now have the Crankhub design flaw in the back of your mind with the S55 engine. Its not a guaranteed failure by any means and the S55 engine powerband wise is amazing but it has been shown that the crank hub can spin causing pretty much catastrophic failure of the engine on even a stock engine....with higher percentage chance on a tuned engine. Seems to happen more with DCT cars and a lot of BMW guys think its sudden torque from the kickdown feature....but there is no solid proof correlation.
If you want to see the failure rates between year to year and manual vs. dct bimmerpost has a huge post on it. Its a small percentage yes....but for me its a large enough amount of failures to keep me from getting an S55 engine (cause I am definitely wanting to tune my engines for more power). If it caused a small issue or small part to break...fine...I can eat the cost, but when they fail BMW pretty much says...yep! whole new engine.
There are some fixes from the aftermarket with this issue that have shown to help and remedy the problem...but unless you do it yourself its like a 4k USD job....just to be able to tune your car with ease of mind! On the flip side....there are s55 engines stock holding 600+whp....but to me that engine tuned is a gamble and a pricey one if it fails
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