Quote:
Originally Posted by E92William
The 3.91 diff is not that bad on the highway, I actually feel the lower numbers are too long. I'm turning about 2k rpms at 60mph. This is on par with my e46 328ci which has a 5 speed and a 3.64 I believe. Plus unless you have a loud exhaust you won't even hear the engine at a higher rpm if you're doing say 80-100. Maybe I'm just used to when I had a 90s Honda and that thing would do 2500 rpms at 60!
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Agree! I had a 3.23 stock, went to a 3.73, and then changed it again to a 3.91. 3.73 (or 3.91
) is perfect for these cars. I would not run anything less than a 3.73. I have no regrets whatsoever running my 3.91
This is with the 3.91 diff in 6th gear. Cruising at 90-100 feels calm and the torque is great I never have to downshift on the highway. These engines are so smooth you would never notice what rpms your turning without looking at the Tach. I figure the cars are made for the autobahn and cruising at 120-130 would have the engines spinning at 4K+ for long stretches so they are perfectly fine with it.
