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      12-11-2012, 09:28 PM   #66
Elk
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Drives: 2012 335i
Join Date: Apr 2012
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Quote:
Originally Posted by Hayir View Post
Why do you say 7and 8 are overdrives. A few posts ago I wrote it. Look at the ratios of the Manual 6 and Auto 8.
A6=M4
A7=M5
A8=M6

Is the 5 and 6 are overdrive for the manual Then it nees to reach the top speed at 4. i don`t think it is the case.
Overdrive is any gear ratio where the engine output shaft turns slower than the drive shaft. It has nothing to do with top speed.

In low gears, such as second, the engine output shaft turns more quickly than the drive shaft. This provides more effective torque to the rear wheels. As one shifts to higher gears, the engine output shaft turns slower for a given speed.

For the automatic transmission, seven and eight are overdrive gears. Sixth gear is 1:1. That is, in seven and eight the engine output shaft turns slower than the drive shaft. In sixth, the engine output shaft and drive shaft turn at the same speed.

For the 335 MT, sixth is the only overdrive gear, fifth is 1:1.
For the 328 MT, fifth and sixth are overdrive, fourth is 1:1.

(For the curious, the final drive ratio of the MT 328 is 3.91:1. For the 335, 3.23)