Quote:
Originally Posted by Boss330
As I said in a previous post; Turbo cars tend to have longer gears since they often have a broader useable rev range than a highly tuned NA engine.
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The reason is more simply because of the massive torque. The current car has a very broad power band with a very high percentage of peak torque across a wide swath of rpm, but its relatively low CRANK torque must be significantly gear multiplied to achieve a desired acceleration. A turbo car does not have that requirement and thus to have improved fuel efficiency will have numerically lower gears/final drive ratios.
NISFAN: As is typical with a final drive modifications one here for the M4 will help some performance contests and hurt others and when considering results say on a strip or track across a wide variety of gears overall it will be a wash. There is no such thing as a free lunch and altering a FD ratio simply does not give one a single speck more power and that is what matters.