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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d. is the premier BMW Forum on the internet. Registered Users do not see the above ads.
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Old 01-12-2005, 10:32 AM   #1 (permalink)
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Jellybelly is an unknown quantity at this point
An odd question about how manuals accelerate faster than automatics. I usually see that manuals are about .5-1 second faster. Now, when testing for acceleration speeds with automatics with Steptronic, do they use the "manual mode" or just leave the car in full automatic? How much faster would, say, a 325i manual accelerate against a 325i auto, but using the Steptronic?
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Old 01-12-2005, 02:04 PM   #2 (permalink)
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peterkulesza is an unknown quantity at this point
imho: won't make any difference, slushbox (steptronic) is always slower due to torque converter losses.

smg should be faster, unless your name is carlos sainz.
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Old 01-12-2005, 07:56 PM   #3 (permalink)
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Steptronic is still an auto trans, it just lets you tell it when to shift.

The gear ratio's in auto's are generally broader from one to the other, so the engine isn't in the powerband as often as a closer ratio manual.
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Old 01-13-2005, 05:55 AM   #4 (permalink)
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yubyub is an unknown quantity at this point
The issue is 1) power loss due to the torque converter, and 2) shifting speed.

An SMG is essentially a manual, but is clutched by computer control ("drive by wire"). Unless you are a good driver, an SMG will be faster for you than a manual. If you really know how to drive, a manual will be faster. In all cases, an auto is slower - if only because the power at the wheels is decreased by the losses introduced by the torque converter.
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