Quote:
Originally Posted by SentraSE-R
You don't need aero mods if you keep your speeds <=55 mph.
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Sorry, but this is
completely untrue. At just over 35 mph,
half of the power to move the car is going towards overcoming aerodynamic drag. At 55 mph, 70% of the power required to maintain speed is going to overcome aero drag. Aerodynamics are a huge factor at all but very slow speeds.
Here is the break down using the numbers for a Tercel.
I also calculated the regearing effect of swapping to a 5 speed (from a 95+ Tercel, the earlier ones had shorter gearing). At 55 mph, the 4 speed puts you at roughly 2550 rpm. The 5 speed will drop that down to 2200. Not a huge drop, but its something. If you put your 4 speed differential in your 5 speed, you'd be down to 2080 rpm. FYI, I'm not 100% sure that the differential does actually fit in the 5 speed bellhousing.