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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 12-17-2007, 12:20 PM   #81
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Please note that these smaller differentials are 168mm differentials compared to the stock 188mm differentials. The smaller gear/driveshaft supports less torque reliably.
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Old 12-17-2007, 04:24 PM   #82
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Please note that these smaller differentials are 168mm differentials compared to the stock 188mm differentials. The smaller gear/driveshaft supports less torque reliably.
This is true, but as long as I'm not supercharged or doing anything crazy, it should be able to handle the stock torque.
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Old 12-18-2007, 04:18 AM   #83
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Very nice write up ! Just what I needed.

- the Euro e46 320i steptronic came with a 3,91:1 diff, but only in some markets (don't know the specifics)
- there was even a 4,44:1 diff for the 316i step

- a diff cooler (Mocal, Summit, Earl's...) would be cheaper than a finned cover and more effective, though harder to "get right" under the car

- just how much torque are these diffs rated for ? I use nitrous so torque is at the very limit of what the step tranny can handle but only in short bursts. I do like to 'fool around' with the car, expecially on wet surfaces. Will I be fine ?
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Old 12-18-2007, 04:33 AM   #84
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Good info to know, thanks kpeng! I got offered a 3.91 limited slip diff for free recently so I think I'm gonna install it.
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Old 12-18-2007, 06:24 PM   #85
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Originally Posted by Mmmmmmmmmm View Post
Very nice write up ! Just what I needed.

- the Euro e46 320i steptronic came with a 3,91:1 diff, but only in some markets (don't know the specifics)
- there was even a 4,44:1 diff for the 316i step

- a diff cooler (Mocal, Summit, Earl's...) would be cheaper than a finned cover and more effective, though harder to "get right" under the car

- just how much torque are these diffs rated for ? I use nitrous so torque is at the very limit of what the step tranny can handle but only in short bursts. I do like to 'fool around' with the car, expecially on wet surfaces. Will I be fine ?
I actually think the same 4.44 came in the auto X3 3.0si...I'm not 100% though.

I've never heard of a "diff cooler".

And I think it will be just fine as far as torque. The same diff is used in some of the euro 3ers, even some of the diesels I believe. And if that's the case, you have nothing to worry about as far as torque is concerned, lol.

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Good info to know, thanks kpeng! I got offered a 3.91 limited slip diff for free recently so I think I'm gonna install it.
No prob! That's what I'm here for! How did you get a 3.91 LSD? And from what car?
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Old 12-18-2007, 07:11 PM   #86
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My 4th was nothing like that with my 3.46
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Old 12-18-2007, 08:18 PM   #87
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Raphy! Get your diff!!!
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Old 12-19-2007, 06:04 PM   #88
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I've never heard of a "diff cooler".

And I think it will be just fine as far as torque. The same diff is used in some of the euro 3ers, even some of the diesels I believe. And if that's the case, you have nothing to worry about as far as torque is concerned, lol.
It's like a tranny cooler (basically a small oil cooler).

If it's the 318d, we put out way more torque than those if we upgrade our six bangers. They have approx. the same peak torque as a 330i. I thought the 320d and 330d had the bigger diffs but I never checked. They have taller gearing anyway.
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Old 12-20-2007, 02:31 AM   #89
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Please note that these smaller differentials are 168mm differentials compared to the stock 188mm differentials. The smaller gear/driveshaft supports less torque reliably.
Yes, this is true.
For those using in racing applications, you would need to add a LS unit so as to not break something like the spyder gear. Someone thiking of using this in wet or ice without a Limited Slip unit would certainly break it.
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Old 12-20-2007, 02:40 AM   #90
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No prob! That's what I'm here for! How did you get a 3.91 LSD? And from what car?
My neighbor preps Porsche and BMW race cars and had one from a 330i/ci project. I've been lending him a hand with moving his shop from one location to another. And in return I'm getting a 3.91 limited slip diff and M3 steering wheel for free. Guess it reinforces my idea of being nice to others and getting favors in return.
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Old 12-20-2007, 12:57 PM   #91
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Yes, this is true.
For those using in racing applications, you would need to add a LS unit so as to not break something like the spyder gear. Someone thiking of using this in wet or ice without a Limited Slip unit would certainly break it.
This is true. I think I'll be ok though in sunny Florida, lol. I only do the occassional open road course event, so I'm not a track junky either. Just want some more umph on the streets.

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My neighbor preps Porsche and BMW race cars and had one from a 330i/ci project. I've been lending him a hand with moving his shop from one location to another. And in return I'm getting a 3.91 limited slip diff and M3 steering wheel for free. Guess it reinforces my idea of being nice to others and getting favors in return.
That's awesome! Hook a brotha up!
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Old 12-20-2007, 07:17 PM   #92
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It's like a tranny cooler (basically a small oil cooler).

If it's the 318d, we put out way more torque than those if we upgrade our six bangers. They have approx. the same peak torque as a 330i. I thought the 320d and 330d had the bigger diffs but I never checked. They have taller gearing anyway.
Got a link to one? I can't find any "diff coolers"
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Old 12-20-2007, 10:23 PM   #93
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http://www.racerpartswholesale.com/c...ix_Oil_Coolers

something like this, but you will need a pump to circulate the oil too
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Old 12-20-2007, 10:26 PM   #94
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http://www.racerpartswholesale.com/c...ix_Oil_Coolers

something like this, but you will need a pump to circulate the oil too
interesting do you think a cooler is necessary for a primarily street driven car?

OT i see your from Grand Rapids. I grew up there. Go Blue.
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Old 12-20-2007, 10:35 PM   #95
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the way i see it, even if i am going for track days, all I would need is a finned diff cover if I have LSD in my diff.
you just need to change the oil more often if the oil constantly sees high temps.
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Old 12-20-2007, 10:38 PM   #96
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That's awesome! Hook a brotha up!
If you had a coupe I could get a you an entire red M3 interior for a good price...
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Old 12-20-2007, 10:54 PM   #97
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interesting do you think a cooler is necessary for a primarily street driven car?
This is just a guess:

If you drive your car for extended periods of time at high RPMs and do lots of cornering, say like many laps on a track, than you would probably have less maintenance and better reliability with a diff cooler. But for a car that only sees aggressive driving and one lap autocross circuits I would think it not necessary.

But since the gear oil is not as dependent on temperature as say engine oil(which is circulated and pumped through many orifices), I bet a cooler could be added with no negative side effects and be added insurance for keeping the diff from getting too hot.

This is just some of the deductions I've got from reading forums. So this is just a guess. I would love to hear what someone who actually knows what they are talking about(unlike me) would have to say.
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Old 12-21-2007, 03:58 AM   #98
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Check out the coolers for the diffs on the Nissan Skyline R34 GTR Z-tune : they're clearly visible from behind.

http://www.nismo.co.jp/Z-tune/index.html

Go to "Chassis" and scroll all the way down.
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Old 12-21-2007, 05:28 AM   #99
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does the x3 3.91 have LSD ?
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Old 12-21-2007, 08:56 AM   #100
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does the x3 3.91 have LSD ?
No.
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