Thread: Cd or weight?
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Old 10-30-2020, 12:55 PM   #25 (permalink)
Ecky
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Quote:
Originally Posted by oldtamiyaphile View Post
Racecar gearing is not a brag on this forum though

Your engine capacity to weight ratio is about the same as my Jeep (4.0), but even that can't pull 6th until ~40mph.
I'm getting off into the woods a bit here, but I had, at considerable expense, a custom final drive cut a full 40% taller than what came in the transmission, and installed a 6th gear a further 14% taller, then upsized my tires a bit. I'm turning 650rpm @ 20mph, and 2100 @ 65mph, in a high revving engine (revs out to near 8000).

My fuel economy vs speed curve is approximately:




The displacement to weight may be similar to your Jeep's, but the power to weight is closer to that of a base C7 Corvette. It's less efficient than it was with the stock 1L engine, but I'd hardly call it "racecar" gearing.
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