Quote:
Originally Posted by Citizen Z
The place that HP peaks, or close to it, is where you should shift. Horsepower reflects an engine's ability to do work. Its a simple fact that the N54 loses some of its ability to hustle the 135i down the track after a certain RPM between 5000 and 6200, depending on your mods, tune, octane rating, etc. Establish where that point is and shift just after it. The extra RPM you have available to redline don't matter for shit if you don't make more horsepower up there.
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Basically what I mean here, for the math geeks, is when the derivitive of the acceleration curve equals zero, that is your shift point, provided the RPM drop doesn't put you into an area on the torque band where the momentary derivitive isn't increasing. /calculus
