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Real High RPMs for 100 mph... (archive)
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Posted by KeithF on November 11, 2001 at 23:32:27:

In Reply to: How many people have the Close Ratio'dogleg' trans posted by Tim In PA on November 11, 2001 at 20:35:54:


Hello All,
Just curious as to how many listers have this trans. I am thinking about switching to a 3.25 rear instead of the 3.07, but find that I am already pushing 4150 rpm at 100 mph. Hope all is well.

Tim In PA
1986 M535i

Both of my cars (5&7) have 265 boxes and 3.25 LSDs and turn 4000@114mph in 5th. That's the torque peak for the 3.5. At 60 they turn about 2100.

So you are at about 2500 when you go up past 60? With a 3.73 in the overdrive box, the 60mph revs would be 2420. So you have what is supposed to be the US ideal rev range combination, based on your data. Most do not want a shorter rear than 3.73 with a manual O/D as the 3.91 is the next choice and the board says it is too short. A 3.91 should rev at 2530 for 60. Let us know what you're doing with this car!!!


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