Quote:
Originally Posted by JFFerner
It seems too much might not be enough, meaning the extra shift into fourth gear is offsetting any positive impact of torque multiplication when using the 4.10 ratio. Why not use a 3.73 ratio which will give a smaller torque multiplying advantage, but will keep you in third gear in the 7000 rpm range through the traps.
And so it goes....Jim
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Yeah... That's where hp elbows its way into the discussion. For example, I (and several others here in FBI country) are @ or above 500 hp. I go through the traps at 121 mph and just as my shift light comes on (at 7100 rpm). A 3.73 would require a shift to 4th before the traps.
However, a 3.73 may be correct for a stock motor. When mine was stock, I ran 112 mph in the traps at about 6600. A 3.73 might be a good stock motor ratio.
This echos back to what Lee says - that being power mods are what makes the big difference, at least in the ZR-1/ 1/4 mile performance.