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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 07-09-2012, 10:28 PM   #41
Qik-BMW
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Quote:
Originally Posted by NaZty NaZe One! View Post
hey everyone. im looking to change out my stock diff from my 02 33oci for a quicker more responsive differential. i read up on kpengs diff swap and like the improvements, however im still a little hesitant.

can i have some opinions on which to get the 3.64 or the 3.91. is the labor needed to install them the same (e.g., the 3.91 needing the longer drive shaft, etc)?

thanks in advance!
I have done both In my 325 auto. I first went with a 3.64 diff and I was not impressed with the difference. A month later I found a 3.91 diff and that is the way to go, nice difference with the 3.91. Now that I have done the manual swap I need a 3.46 diff back in her.
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Old 07-12-2012, 11:34 PM   #42
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So I got her installed but haven't been able to really test her out. It's Definetly an improvement but not substantial. I definitely feel stronger off the line. I usually cruise around 80 but now because of the higher rpm's, I'll probably coast at 70-75 @ around 3k rpm. If I go higher it will be too much gas (80@ 3600rpm). I'll update it once I get a little used to it.
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Old 07-12-2012, 11:57 PM   #43
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step on it from 1st gear through 2nd and into 3rd and you should feel a nice difference .. now is when you want to raise your rev limiter to take advantage of the shorter gears and stay in 1st and second longer
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Old 07-13-2012, 12:13 AM   #44
daniel_f.
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its definately more powerfull then with stock diff. once you drive it, you can feel it.

fuel consumption decreased around 1 liter
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Old 07-15-2012, 02:03 PM   #45
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The power is there. Even when on the highway, you can press down and the car responds with more umf. You can really feel the power when trying to switch lanes too, you can punch it and it'll go.
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Old 07-20-2012, 01:49 PM   #46
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I'm getting in this too. I have a '99 5spd 323i.

What car comes with the 3.64 final drive factory? Or where can I buy just the gear?

I don't want to buy a whole diff. I'd much rather buy JUST the final drive gear then weld the diff.
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Old 07-21-2012, 06:18 AM   #47
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Are you able to measure backlash and adjust it?
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Old 07-21-2012, 07:35 AM   #48
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Don't know how too but nothing research can fix
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Old 07-21-2012, 09:06 AM   #49
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Originally Posted by cinimod View Post
I'm getting in this too. I have a '99 5spd 323i.

What car comes with the 3.64 final drive factory? Or where can I buy just the gear?

I don't want to buy a whole diff. I'd much rather buy JUST the final drive gear then weld the diff.

sooo, according to bmwfans.info you have a 188k diff with 3.07 ratio. the automatic cars use a 3.46 ratio which should be more common then the 3.64 from a zhp. otherwise, you live overseas where zhps can be found, unlike here in germany.

so buying a zhp diff should be far easier then dealing around with adjustment shims and backlash measuring.

if you definately just want the gears, try to find them from a zhp diff.
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Old 07-22-2012, 05:27 PM   #50
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Quote:
Originally Posted by NaZty NaZe One!<br />
hey everyone. im looking to change out my stock diff from my 02 33oci for a quicker more responsive differential. i read up on kpengs diff swap and like the improvements, however im still a little hesitant. <br />
<br />
can i have some opinions on which to get the 3.64 or the 3.91. is the labor needed to install them the same (e.g., the 3.91 needing the longer drive shaft, etc)?<br />
<br />
thanks in advance!
<br />
<br />
I have done both In my 325 auto. I first went with a 3.64 diff and I was not impressed with the difference. A month later I found a 3.91 diff and that is the way to go, nice difference with the 3.91. Now that I have done the manual swap I need a 3.46 diff back in her.

How much did the 3.92 diff cost you. I have an auto 2000 328i and would like more power
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Old 07-22-2012, 08:20 PM   #51
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Is this a 3.64 or a 3.91? I would prefer the 3.91 if I'm going to do it but if the 3.64 is stronger and an easier of a swap, that is what I want. I want to be able to just unbolt my differential and bolt the new one on and start driving.
The 3.91 is just as easy to swap and I am running a list of mods with a 75 shot of nitrous on my 3.91 diff with no problems!
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Old 07-22-2012, 08:22 PM   #52
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Originally Posted by Bmw328monster View Post
<br />
<br />
I have done both In my 325 auto. I first went with a 3.64 diff and I was not impressed with the difference. A month later I found a 3.91 diff and that is the way to go, nice difference with the 3.91. Now that I have done the manual swap I need a 3.46 diff back in her.

How much did the 3.92 diff cost you. I have an auto 2000 328i and would like more power
I think I paid $350. I am going to sell it in few weeks cause I need a 3.46 diff since I have done the manual swap.
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Old 07-22-2012, 11:38 PM   #53
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Quote:
Originally Posted by cinimod View Post
I'm getting in this too. I have a '99 5spd 323i.

What car comes with the 3.64 final drive factory? Or where can I buy just the gear?

I don't want to buy a whole diff. I'd much rather buy JUST the final drive gear then weld the diff.
Can buy my diff...of a ZHP...
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Old 07-25-2012, 02:40 PM   #54
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The M3 3.62 LSD is one of the greatest mods I've ever done. Short gears FTW!
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Old 07-25-2012, 02:54 PM   #55
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The M3 3.62 LSD is one of the greatest mods I've ever done. Short gears FTW!
i would love to but freeway driving kills. i really want a lsd i might be looking into wavetrac before the summer is over
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Old 11-23-2012, 03:03 AM   #56
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I think I paid $350. I am going to sell it in few weeks cause I need a 3.46 diff since I have done the manual swap.
Do you still need 3.46 diff?
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Old 11-24-2012, 03:16 AM   #57
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Well, instead of my ealier postings i would NOT use a 3.91 diff anymore WHEN im allowed to drive topspeed. luckily our german autobahnen are sometimes unrestricted and now comes the tricky part:

the egs measures the turbine rpm in each gear and if in fifth gear ~5500rpm is reached, the dme is told to lower hp/torque. if the car still accelerates (driving down a hill) the transmission goes into limp mode and opens all clutches

thats what i found out yesterday on a dyno and i got somewhat upset when the car made a huge shake at ~ 240km/h and the malfunction lamp appeared.

if you arent allowed to cruise at really high speeds, 3.91 is ok. otherwise id go with the 3.73 or 3.64 unless the egs software can be changed to accept higher rpms in fifth gear.
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