Quote:
Originally Posted by Subie
There is one more aspect to the gearing that affects the top speed though. If a given car is able to reach the top of 5th gear, for example, but upon shifting to 6th gear isn't making enough torque to accelerate further, the top speed will actually be determined not by the overall gearing of the vehicle but by the difference between the 5th and 6th gear ratios. Without driving a BRZ I can't say for sure what the limiting factor will be, but in general, it's not as simple as which car has the taller 6th gear all else being equal.
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Actually, it the the rate of torque delivery, horsepower, that determines the ability to overcome drag.
You would probably never get out of 5th in the AT, and whether the AT 5th or MT 6th is better for top speed is an unknown at this point. It might even be a duel between AT 4th and MT 5th. I haven't done the calculations yet. I don't know the frontal area, or I'd give it a go.