Quote:
Originally Posted by Dinan_Engineering
Has nothing to do with wheel versus crank horsepower. BMW rate at the crank as does Dinan. For whatever reason BMW seems to be underrating its engines in this generation by our measuring methods. It is more prevalent in the M lineup but in almost every application we have noted a discrepancy in the ratings versus what we actually measure at stock, especially in the torque department.
Our charts are shown the way they are just so its clear that we are not taking credit for power we do not make. As to the reason why they are being underrated... your guess is as good as ours.
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I am an idiot, forgot this was a 28i for a moment. Those numbers are bang-on for whp numbers from the N55 engine.