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Originally Posted by R33GTS-T
from your weblink Brian it states that the J30 diff has a 3.92 final while the z32na diff has a 4.08 final drive then wouldn't the z32 diff actually give me slightly shorter gearing when compared to the j30???  |
Yes, 3.92 final drive will give you slightly taller gear ratios than the 4.08, but the difference isn't really noticable.
I had the stock open diff from the S13 with the 4.08, would do about 3500rpm at 80mph.
Then I switched to the J30 diff with the 3.92 final drive and now I'm at around 3300rpm doing 80mph.
Not that much difference.
However, now that I've put 17s with 225/45/17 tires on, at 80mph I'm more closer to like 3100rpm. Will be going with 235/40/17s next, so that should bring the rpms right back up to around 3200-3300rpm @ 80mph.