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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 06-28-2012, 11:15 AM   #1
hellaflush 330c
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What would be the best gears to run in my 330ci sport

I've read about people putting x5 gears in em but I want more acceleration and top end

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Old 06-28-2012, 11:36 AM   #2
j_block
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Do you have 5 or 6 speed?

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Old 06-28-2012, 12:35 PM   #3
hellaflush 330c
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its 5 speed man. trans.
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Old 06-28-2012, 01:08 PM   #4
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Looks like your out of luck, with new gears you can either get better acceleration or higher top speed, not both. The lower numericly the gear is, the higher top speed youll have, the higher numericly the gear is, the faster the acceleration.

With a five speed your best bet is probably a 3.15 or 3.38 at the lowest. I run a 3.15 in my 330 5speed and im happy with it. Stock in a 330 is 2.93.
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Old 06-28-2012, 01:38 PM   #5
hellaflush 330c
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thanks alot man! one more question... would it be better to switch the whole rear end or just add the gears to my rear end. or replace rather?
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Old 06-28-2012, 03:26 PM   #6
mystert
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Replace the whole pumpkin, its waaaay easier. Get a 3.15 differential from a 325i manual trans. You have to swap the input and output flanges from your differential to it. When your in there, replace the rear differential mounting bushings, they go bad fairly quickly and cause a big clunk when changing gears. Its easy to get to once the diff is out.
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Old 06-28-2012, 04:42 PM   #7
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And mark the nut on the input flange before you remove it so you can tighten it back to the same spot, otherwise you risk making the gear lash to tight and you will eventually get a whining noise from the diff. And I also recommend replacing the axle seals while you have the diff out and the flanges off already along with new fluid.
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Old 06-28-2012, 11:40 PM   #8
daniel_f.
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Quote:
Originally Posted by Bimmerci330 View Post
And mark the nut on the input flange before you remove it so you can tighten it back to the same spot, otherwise you risk making the gear lash to tight and you will eventually get a whining noise from the diff. And I also recommend replacing the axle seals while you have the diff out and the flanges off already along with new fluid.
no one knows if the flanges are exactly the same in height, so marking the nut to the pinion doesn´t mean you re-torque it to the right specs.

when changing the input flange, measure the rolling resistance in torque, which is a pretty low number, but its much better then tightening by rotational degree.
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Old 07-05-2012, 01:10 PM   #9
Bimmerci330
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When I changed mine they seemed to be the same length and I marked it and tightened it back to the same place. No issues and it's been about 20k miles
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Old 07-06-2012, 08:02 PM   #10
Steven747
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bunch of good info on here.theres a guy names nazty nasty 1 or something in socal and performance section with a 3.38 diff. with a 5spd if you can score a 3.23 thats your best bet
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Old 07-06-2012, 10:28 PM   #11
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I had a 3.07 out of a ZHP in my 323i when I did a 5 speed swap and liked it. If you drive a lot on the interstate you may want to stick with 3.07 or lower (numerically lower). If you don't, a 3.15 is a good gear or the ever elusive 3.23 as mentioned above. I put a 3.38 in a 5 speed 330 for a guy once and he loved it, but IIRC he was buzzing above 3700rpm at 75mph.

Here is a great link to help you decide.

http://www.bokchoys.com/differential...calculator.htm
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