Quote:
Originally Posted by Sir Loin
With this power curve chart, I thought it is kind of weird that it has a flat top between 5500 RPM to 7200 RPM. Unless BMW somehow clip the engine output, the HP should peak at 460 or higher at around 6500 RPM if you ignore that flat top and hand draw a curve between the two end points on that flat line.
Is this how BMW under-rates their engines?
 |
I'm figuring that flat top occurs because all turbo engines back off the turbo pressure as the engine approaches redline, so perhaps BMW has simply tuned the engine so the power drop from the turbo dropoff is exactly canceled out by the power increase courtesy of rising engine speeds, yielding a constant horsepower in that range.