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Showing results for tags 'diff ratio'.
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Diff ratio opinion on driveability at 110km/h Hi all, In the middle of a custom RB25DET build and have yet to drive a Skyline. Its diff ratio selection time, the options I have are the standard Ford 9" ratios. The engine has not been on the dyno yet, but has forged bottom end, hi flow turbo, injectors, mild cams and a programmable ECU so I do not know what it is like down low. I need to know if 3.89:1 will be ok on the highway in the 100 - 120km/h range. More to the point, are these engines completely hopeless at around 2400 - 2800rpm? If so, then I can go 4.11 which increases the RPM range to 2500 - 3000rpm. Anyone running a ratio different from factory please may I have your opinions on how you find the day to day driveability on the open road?