Max speed on gears 325i, 325Xi, 330i, 330Xi - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 11-18-2009, 02:13 PM
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Max speed on gears 325i, 325Xi, 330i, 330Xi

Does anyone know what is the maximum speed on 1st, 2nd, 3rd and 4th gear in 325i, 325Xi, 330i, 330Xi?

Thanks
Radek

Last edited by iradek; 11-18-2009 at 02:16 PM.
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#2 (permalink) Old 11-18-2009, 03:18 PM
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Quite simple really BMW's have a rev limiter, so once you reach the top revs for that gear, which is a very very bad thing to do it will sort of cut in cut out until you change up.

If you require the exact speeds for each model...search google for owners manuals on each, in the technical data it will specify the speeds per gear ratio.

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#3 (permalink) Old 11-18-2009, 03:48 PM
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That's the problem, they don't say it in the owners manual, only top speed. I tried to google it with no luck.
Thanks
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#4 (permalink) Old 11-18-2009, 04:38 PM
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If you can find the gear ratios (and final drive), a calculation utility like this one can answer your question. Again as marti5 stated, running to top speed in each gear is not the best idea.

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#5 (permalink) Old 11-18-2009, 04:55 PM
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Might need tranny and diff ratios for each model:
BMW E46 Differential Info

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'00 323i for the road and track
'03 H2 for making my own road
...neither are anywhere near stock.
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#6 (permalink) Old 11-21-2009, 05:20 PM
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The reason Im asking this is because I've just bought 325Xi 2002y, manual transmission and on every gear car goes slower than it should.
On 3rd gear the max speed is about 120km/h (75mph), on 5th gear 210km/h (130mph). It should be 150km/h(90mph) and 240km/h (150mph) respectively.

Does anyone know whether it's the gearbox, transmission box or the diffs?

Thanks for your help
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#7 (permalink) Old 11-21-2009, 07:11 PM
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Quote:
Originally Posted by iradek View Post
On 3rd gear the max speed is about 120km/h (75mph), on 5th gear 210km/h (130mph). It should be 150km/h(90mph) and 240km/h (150mph) respectively.

Does anyone know whether it's the gearbox, transmission box or the diffs?
Is that indicated speed [speedo]? @ what RPM? BMW E46 transmissions are are nearly identical in gearing. Diff has the largest impact to speed vs. engine RPM. Wheel size has largest impact to indicated vs. actual.

Franz


'00 323i for the road and track
'03 H2 for making my own road
...neither are anywhere near stock.
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#8 (permalink) Old 11-22-2009, 03:15 AM
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It's indicated speed at around 6000 rpm. Wheels are 225/45/17 front and 245/40/17 back.
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#9 (permalink) Old 11-22-2009, 03:56 AM
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Well those speeds don't look like they match for the stock 3.23 ratio's...more like a 3.46. Had someone swapped in rear diff and front final with 3.46's from and automatic? Not that it is a bad thing, for you will get a bit more accel/torque transfer to the ground. Common mod for E46 (like from 3.07 to 3.46) but a bit more tough and not so common on an 'x'.

BTW, have 3.46 in daily driver with 245/45-17's all around and yes, top speed is less (although limiter has been raised) yet get to speed quite a bit quicker.

Franz


'00 323i for the road and track
'03 H2 for making my own road
...neither are anywhere near stock.

Last edited by Technikzauberer; 11-22-2009 at 03:59 AM.
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#10 (permalink) Old 11-22-2009, 12:01 PM
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I think you're right. Someone must've swapped diffs. I've already managed to buy second hand front today on ebay but there I can't find rear 3.23 diff for 325Xi.
Do you know if 3.23 diff from RWD cars (323, 325, some 316 and 318 here in Europe) would fit 325Xi?
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#11 (permalink) Old 11-22-2009, 01:25 PM
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yes they should...may have to pay attention to the input flanges though (4 bolt vs. 6 bolt, etc.).

Franz


'00 323i for the road and track
'03 H2 for making my own road
...neither are anywhere near stock.
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#12 (permalink) Old 12-02-2013, 10:25 AM
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This post was o.k. written, and it to boot includes a allotment of useful facts. I enjoyed your differentiated technique of composing the post. Thanks, you have created it very simple on behalf of Maine to know.

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