if you could get 6th gear up to 7500 RPMs the theoretical top speed while in 6th gear would be 195. This is based on Car and drivers specs for the 370z.
GEAR RATIO MPH PER 1000 RPM SPEED IN GEAR
I 3.79 5.4 41 mph (7500 rpm)
II 2.32 8.9 67 mph (7500 rpm)
III 1.62 12.7 95 mph (7500 rpm)
IV 1.27 16.3 122 mph (7500 rpm)
V 1.00 20.7 155 mph (7500 rpm)
VI 0.79 26.0 157 mph (6050 rpm) TOP would equal 195MPH in 6th
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