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The two engines are really pretty close in usable power. The 135 has torque lower and the M3 has high rpm horsepower. What everyone is forgeting in these acceleration comparisons is gearing.
6MT 135i rear axle ratio= 3.08
6MT M3 rear axle ratio = 3.85
I an acceleration contest with two cars of similar power and weight the car with the 3.85 rear axle and a limited slip should win every time. The engines and weight are two close to make a real difference with such a disparity in gearing.
A big part of the M cars is gearing and limited slip when it comes to acceleration. This is why I have been wondering what the 1M will get for gears?
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