Re: Improving accelleration by changing diff ratio.
i have a EB XR6, it came with a 3.45LSD and i put in a 3.9LSD from a skyline, and sold my diff to 94ED_Fairmont, who had a 3.08 open diff. my car revs about 250-300rpm higher on the freeway@100, dont know about 94EDs though.
my car gets out of the hole like its been kicked in the ass, and 94s car is also noticably faster - he hasnt lost to a V6 commo since he put the diff in :D
unfortunately i cant give you an accurate 1/4 mile time comparison, my best has been a 15.5@90mph, and with this diff was 15.5@88mph - the reason the times are so poor is because my computer is pouring in fuel like you wouldnt believe, so it pretty much wont rev past 4500 in any gear other than 1st.
my last run with the 3.9s it was in 4th gear at 4500 about 80m before the finish line, not accelerating at all and missfiring (stupid piece of S()&#$^@#*!!!!)
so the potential is there for a good time, but the comp is holding the car back.
the best thing to do is get hold of a skyline LSD of whatever ratio you want, take it to a diff shop (if you are handy with tools and can do without your car for a while take your diff out and give it to them too) then they will only charge you labour for replacing bearings/seals/oil and 'lapping' in the diff gears, and you pick it up take it home and put it in yourself.
as pretty much a rule you wont be able to find a diff shop that will replace just gears - they all insist on doing bearings and seals at the same time.
i would go 3.7LSD for a compromise, but 3.9s are sweeeeet :D
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