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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 05-30-2004, 01:14 AM   #1 (permalink)
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Did finished the auto to manual swap. Everything went great, took about 10 hours total to do. I didn't change the differential though. My question is, should I? at about 70mph, my car is hitting about 4000rpms, is this normal for those of you who manual trannies? if I should change it, what ratio should I change it to and where can I get it? Don't send me to zionautosport or whatever either, too damn expensive!

Btw, I love my bmw even more now. Car absolutly jumps off the line and it it's 100x more responsive which I love.
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Old 05-30-2004, 01:35 AM   #2 (permalink)
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4k at 70mph seems a little high for me. I think it should be closer to 3200, but I'll go check tomorrow.

I do know the gears top as follows. 1st should be about 35mph, 2nd should be around 53 mph, 3rd like 75-80 (not possitive on that one)

If you can pick up a 3.15 LSD off a manual 325i that'd probably be best. But if you don't mind the high revs on the highway your car will be quicker with the shorter gearing.

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Old 05-30-2004, 02:34 AM   #3 (permalink)
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the revs will be much higher due to the different gearing. 4k is high for 70 (my 1.8 is around 33-3400), but normal given it has 3.91 gears. If you are into acceleration, and don't mind the revs, I say keep it. Your top speed will be between 90-100 though.
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Old 06-04-2004, 01:24 AM   #4 (permalink)
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my 1.9 -----


mph rpm
70 - 3200
75 - 3400
80 - 3700
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Old 06-04-2004, 07:04 AM   #5 (permalink)
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Same here...on the 318i as Prez and Tee...I don't hit 4k rpm until I am going 85mph...I would get the differential changed. If you can, look up a used parts dealer or something, find a manual differential off a used BMW. This will save you some serious cash. But make sure to have it inspected or checked out by a mechanic...you don't want to put broke parts on your baby.
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Old 06-04-2004, 11:47 AM   #6 (permalink)
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My car:

2950 rpm @ 70 mph (112.6 km/h)
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Old 06-04-2004, 04:34 PM   #7 (permalink)
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Unless I misread...did you say what gear you're in at 70? Is it 4th or 5th?

Also...tire/wheel size will make a bit of a difference also...but not too much.
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Old 06-05-2004, 10:37 AM   #8 (permalink)
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Mine is in 5th gear with the values above.
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Old 06-05-2004, 01:50 PM   #9 (permalink)
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My 94 325i has the same rpm's as dutchbmw at 70 in 5th gear: 2950. In 4th gear at 70 it's around 3800.
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