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Old 06-27-2018, 04:03 PM   #13 (permalink)
Ecky
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Join Date: Dec 2011
Location: New Zealand
Posts: 5,077

ND Miata - '15 Mazda MX-5 Special Package
90 day: 39.72 mpg (US)
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Trying to decide.

3.4 FD, stock 165/65r14 tire size
2180rpm @ 65mph
1680rpm @ 50mph

3.4 FD, common 185/65r14 tire size
2085rpm @ 65mph
1605rpm @ 50mph

4.105 FD, stock tire size
2635rpm @ 65mph
2025rpm @ 50mph

4.105 FD, 185 tire size
2520rpm @ 65mph
1949rpm @ 50mph


Honda Insight 1.0L gearing - 3.208 final drive
2350rpm @ 65mph
1810rpm @ 50mph


I really think a 3.4 FD is a good idea, but it adds considerable cost to the build. I suppose the 4.105 wouldn't be the end of the world if I moved to a larger diameter tire too.
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