325i manual vs. automatic RPM - BMW Forum - BimmerWerkz.com
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.

 
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#1 (permalink) Old 08-28-2004, 06:30 PM
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Hi there,

A strange question. I have a '01 Bimmer 325i with stick trans. One of my buddies just bought a '04 325i with auto trans. The interesting finding is, his bimmer hits 80 mph with 3K RPM. Mine hits 80 mph with 3.5K RPM. Is this normal? Is there something to do with the difference in trans.? Thanks.
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#2 (permalink) Old 08-29-2004, 03:46 AM
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Its got to do with the gear ratios and differential. His gearbox has either a taller top gear, or taller final drive ratio.
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#3 (permalink) Old 08-29-2004, 12:19 PM
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Thanks... but isn't all bimmers (at least E46s) suppose to have the same ratio?
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#4 (permalink) Old 08-29-2004, 01:28 PM
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No sir, they do not.

Manual and automatic gears definitely have different gear ratios.

Even in manual gear models, 6 gear models have overdrive (less than 1.0 gear output ratio) so it will rev lower at 80 mph.

If you want to know the gear ratios in detail, just look at the specifications given out on bmwusa.com or other BMW corporate sites.
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#5 (permalink) Old 08-29-2004, 02:00 PM
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Ooommm, very educational. Thanks very much.
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