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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 05-24-2011, 10:32 AM   #1
Tlvivo
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Diff????????

Wassup yall...

i drive 320i steptronic my diff is messed I know nothing about diffs but it started making a knocking sound one day when I was pulling off a robot... Finally got the thing out the car and this is the result:

look inside - teeth are broken - what could cause this?




when i turn this propeller i get the knocking noise


is the last few number my ratio on the diff?
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Old 05-24-2011, 12:32 PM   #2
aggieE46
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Yep, last numbers are your ratio.
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Old 05-24-2011, 01:45 PM   #3
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thanks aggieE46, so when looking for replacement how much does this matter i have had someone offer me 3.38?
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Old 05-24-2011, 02:07 PM   #4
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A 3.38 is going to make your car accelerate slower and its going to drop your revs when cursing make it a little more fuel efficient.
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Old 05-24-2011, 02:09 PM   #5
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Originally Posted by Tlvivo View Post
......... how much does this matter i have had someone offer me 3.38?

3.91 to a 3.38 diff is a 13.5% LOSS.

You probably don't want that.


Good luck.
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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 05-24-2011, 02:13 PM   #6
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right seems like I am getting the hang of this now - how high can I go after 3.91?
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Old 05-26-2011, 09:35 PM   #7
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wow stock you have a 3.91 thats preety cool
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Old 05-27-2011, 07:57 AM   #8
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Hey Steven747 yes, is that unusual?
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Old 05-27-2011, 08:05 PM   #9
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Hey Steven747 yes, is that unusual?
From what I recall I've only heard off diff ratios that high on x3 and 5 autos.. Does it pull kinda hard through first?
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Old 05-30-2011, 05:13 AM   #10
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No it doesnt pull hard at all... I enjoy this car, a lot of people get shocked when they find out its a steptronic... because it drives so well...
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Old 06-27-2011, 03:50 PM   #11
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guys finding a 3.91 ratio diff is proving pretty tiresome cannot find one anywhere, if i had to get a 3.64 ratio how much loss am i looking at there and what can i gain? Your expert knowledge would be appreciated.
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Old 06-27-2011, 04:31 PM   #12
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guys finding a 3.91 ratio diff is proving pretty tiresome cannot find one anywhere, if i had to get a 3.64 ratio how much loss am i looking at there and what can i gain? Your expert knowledge would be appreciated.
Alot better gas mileage
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Old 06-27-2011, 04:47 PM   #13
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Take a look at this.....


http://www.diffsonline.com/product/gearsets.shtml



Good luck.
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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 06-28-2011, 09:26 AM   #14
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Rob thanks for the link its pretty affordable to get these gear sets even if i have to ship them - how hard is it to replace? Can I DIY or not?
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Old 06-28-2011, 02:18 PM   #15
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Rob thanks for the link its pretty affordable to get these gear sets even if i have to ship them - how hard is it to replace? Can I DIY or not?
Can't answer, I've never rebuilt a diff. I'm told you need to be Very Precise, If you DIY definitely read up on how to do it.

Good luck.
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Need Help With Your Nitrous Ambitions ?.....PM ME
Quote:
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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 06-28-2011, 02:59 PM   #16
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Bulding a diff is a bit of an art. I wouldn't normally recommend the average DIY'er attempt it. It is doable though and if you decide to tackle it make sure to do your homework before diving in - it's really easy to ruin a diff if it's not built right.
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Old 06-28-2011, 03:24 PM   #17
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I can pretty much rebuild anything and have done a fair share of diffs in other cars. For mine, I am willing to spend the bucks to have someone else to do it.

Also, if you are looking at diffs, the Z4 and X3 take the same diff housing. This means they will bolt up into an e46. For example, my diff is from a 2007 Z4 3.0i automatic. For $400 I got a complete 3.73 diff which was better than the $1200 I was getting quoted for just a 3.73 ring and pinion.
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Old 06-28-2011, 04:14 PM   #18
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I can pretty much rebuild anything and have done a fair share of diffs in other cars. For mine, I am willing to spend the bucks to have someone else to do it.

Also, if you are looking at diffs, the Z4 and X3 take the same diff housing. This means they will bolt up into an e46. For example, my diff is from a 2007 Z4 3.0i automatic. For $400 I got a complete 3.73 diff which was better than the $1200 I was getting quoted for just a 3.73 ring and pinion.
Good info. I need to do the same thing.
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Old 07-04-2011, 10:27 AM   #19
Tlvivo
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Guys thanks for the info I really learnt a lot here about Diffs, i did not even know much about how these worked!!! I finally fixed the car on friday - I basically spent most of my saturday looking for a diff and much later in the day I was lucky found a very good second hand 3.91 diff for $298!!!!! While repair places where offering to recondition my old one from about $670 - $1200. My car is back on the road doing what it does best...
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Old 10-19-2014, 05:15 PM   #20
Tlvivo
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Three years and six months and i am replacing yet another diff... My theory, this 3.91 ratio diff wears off too quickly for my style of driving. Thoughts?
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