Quote:
Originally Posted by bimmerjph
I was thinking that it was closer to 500 in an earlier test.
I will say this again. I don't think necessarily that the engines are underrated. I think BMW has made the drivetrains substantially more efficient.
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More efficient by how much???
And how would they make these improvements?
Quote:
Originally Posted by flinchy
560 crank horsepower down to 527.. A bit of under rating but not HUGE
What type of dyno was it? Could be a high reading dyno.. So this is all totally believable :/
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What correction factor are you using?
I've always seen people use 1.21 on BMW's??
E9x M3's typically dyno around 330-340, which works out perfectly.
BMW blown engines are WAY underrated. The N54's seem to be pushing 350 crank HP and the 1M even more. The N55 seem to be putting out a little less than the N54's, but still more than the 300 HP it's listed at.
This engine is CRAZY underrated!! But the torque definitely drops off as the revs go up.
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