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Originally Posted by e*clipse
We'll use the 6.86:1 ratio of the MGR, and consider no weight or aerodynamic issues.
26" tires will allow a top speed of 115 mph, based only on the motor rpm limitation. However, reality is aerodynamic drag, friction, etc are working against hp that decreases from mid rpm > max rpm. The car will be power limited long before 115mph.
Personally, I don't see any use for increasing the tire diameter unless you find a way to dramatically reduce the aerodynamic drag or dramatically increase the power from the motor.
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I found my way here from the Aerodynamics subforum. And this time next week I hope to be on The Salt for the 36hp Challenge. So I bring a perspective of self-imposing limitations, for the challenge. The record for a stock bodied 36hp Beetle is about 90mph, a belly-tank Lakester—about 129mph. So 68hp (as a base) is comfortable for me.
I'll start with a simple EV conversion; ultimately, with a 2nd MGR, I'd like to run a reverse tricycle belly-tank in the 130mph Club—probably the only class that would accept such a curious beast.
Here it is, dragging a fourth wheel to try to fit in better.
