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      08-09-2020, 02:30 PM   #43
M3SQRD
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Drives: 330G20,240F22,M3E92,F82,MCSR56
Join Date: Jun 2009
Location: Mid-Atlantic

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Quote:
Originally Posted by peter de la mare View Post
Close. The DCT’s original 3.154 FD, changing this to 3.62 makes the shaft spin faster. You’re spinning the engine faster for the same speed. It’s handy for demonstration purposes that 7th gear is 1:1, at some tracks the engine revs in 7th are way over the 6,400 rpm limit of the J-Fiber shaft.
Correct. A shorter FD will require the engine to turn at a higher rpm to achieve the same road speed vs. a taller FD; however, the relationship between engine rpm to DS speed doesn’t change when the FD in the diff is changed. I guess I misread your original statement - we’re saying the same thing.
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