VHR + FD Gear Ratio upgrades - 3.9 and 4.08

chuckd05

Z clear your PMs, i have some questions for you about the 4.08s....

also Z you use the MT radials for street use ?


PR370Z , I just noted most cruising speeds and what the RPM is at... These are estimates that I am taking from a before and after video that I took, but the difference isnt all that much, but if you cruise at 80-85 I am sure your gas mileage will suffer some what.

STOCK FINAL DRIVE

60 MPH - 2,350 RPM
65 MPH - 2,600 RPM
70 MPH - 2,750 RPM
75 MPH - 2,850 RPM
80 MPH - 3,000 RPM


WITH 4.08s

60 MPH - 2,500 RPM
65 MPH - 2,800 RPM
70 MPH - 3,000 RPM
75 MPH - 3,200 RPM
80 MPH - 3,400 RPM

Crusiing down 19 Miles of Highway at an avg of 69.2 MPH my MPG was 26.1

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09 370Z 6M PW - FBO Best 1/4 mile = 12.926 @ 109 SOLD -- 08 BMW 135i - FBO 12.1@120mph SOLD -- white 09 e92 335 Coupe Mtech - 11.9 @ 119 :-)