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Originally Posted by pbonsalb
Going from a 3.85 to a 4.10 in an E9X M3 is very different from going from a 3.62 to a 4.10 in an E46 M3 or a 3.23 to a 3.64 in an E36 M3. It is only about a 5% difference and will not make the first two gears useless. BMW selected the 3.85 as a good compromise between efficiency and performance for the average driver -- it was a compromise.
A differential change will affect the multiplication of torque in all six gears on the 6MT, not just the first three gears. It is true that the additional multiplication offered by the transmission ratios ceases once you reach the 1:1 ratio, but that does not happen until 5th gear on the E9X M3 with 6 speed manual. The overall multiplication obviously does diminish as you go through the gears, but you will feel a diff change in 4th, 5th and 6th.
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Isn't the 1:1 gearing reached in 4th gear...?
Hence why we dyno the car is 4th..