Whats the best diff ratio to run?
04-27-10, 05:17 PM
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Whats the best diff ratio to run?
Hows things guys I have a question in regards to diffs.
I have a s4 stage two extend port micro tech ecu and lots of other goodies its putting out 323 houses at rear wheels, It currently has a auto lsd diff 4.10 ratio.
Would it be better to run a manual lsd 3,909 ratio? The car is mainly used as a weekender and for the odd drag day etc.
I have a s4 stage two extend port micro tech ecu and lots of other goodies its putting out 323 houses at rear wheels, It currently has a auto lsd diff 4.10 ratio.
Would it be better to run a manual lsd 3,909 ratio? The car is mainly used as a weekender and for the odd drag day etc.
04-27-10, 07:01 PM
#2
Do you want taller gearing? Using a 3.9 rear end will reduce acceleration & increase top speed. Since 5th gear on a j-spec transmission will top out around 150 mph using a 4.1 rear end, there's not much point to aiming higher. The only real benefit would be slightly lower cruising RPMs.
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