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      07-19-2013, 06:17 PM   #1
zero-2-sixty
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8 speed ZF transmission

If BMW had offered those with 6cyl engines the ZF 8 speed tranny, do you think our 0-60 times would be high 4 second range (say4.8) and low 13 second 1/4 mile?
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      07-19-2013, 07:19 PM   #2
Grovsnus
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No. The torque range is so wide on the N55 that there's not a lot to gain on extra shifts, and because it's an automatic and not a dual clutch, a small but non-negligible amount of time lost per shift, I think the overall 0-60 wouldn't be any better. And the two top gears on the ZF8 N20 are overdrive gears, so there's not a lot of gain on the lower range, if any.
Consider this: A Formula 1 car has seven gears. If there was more gain than loss, they would have eight.

You can get slightly better than advertised times by taking off in 2nd gear from a moderate rev. Doing this on an auto is not good for the automatic clutch, though. And, of course, turn off traction control.
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      07-19-2013, 08:41 PM   #3
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Nope. E90 335's have proven faster than F30 335's, no reason to think the 8s helps with performance, but it would help with efficiency.
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