09-13-2009, 09:08 PM
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#1 (permalink)
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Base Member
Join Date: Aug 2009
Location: St. James, NY
Posts: 237
Drives: 350Z
Rep Power: 16
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Quote:
Originally Posted by steven88
For those of you familiar with this modification, does it effect the overall speedometer/odometer numbers? Or what about Gas mileage numbers?
And also, I know changing the overall diameter of the rear tires will effect final drive gear ratio as well....stock overall diameter for 275/35/19 is 26.5...what overall diameter tire will be required to achieve the same numbers as 4.08 final drive gear ratio? Just curious thats all...I know some might be interested in changing the tire size instead of dropping the rear differential and opening the gear assembly
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speed is taken from the ABS sensor so zero issue with the speedometer
I currently have the 3.9 final drive in my 350Z. Stock final drive on the Z33 was 3.54 for manual trans. cars. So, about an 11% difference. My car gets exactly the same mileage with the gears as it did before them - ~320 miles before it needs to be filled. I've driven as far as 14 hours at a clip with them
you could not put a tire on the car that would equate to these gears. Tire changes amount to very small net changes in the final drive.
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