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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 02-02-2009, 07:27 PM   #1
tchavis1989
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3.91 Differential In A Manual 330i ZHP?

so i'd like to create a lot of fake torque, what is everyone's thoughts on a 3.91 diff swap into a manual (6spd) 330i zhp? would i be killing gas mileage that badly as well as my gearing or would it be safer not to mention economical to go with the 3.46?

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Old 02-02-2009, 07:32 PM   #2
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1st gear would be rendered useless with a 3.91.

I'd do a 3.46. Still a decent jump from a 3.07
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Old 02-02-2009, 07:36 PM   #3
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DO NOT do that.. i have 3.62 and thats pushing it
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Old 02-02-2009, 08:29 PM   #4
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I have a 3.46 and could see how a 3.62 would be livable but a 3.91 would be unbearable for anything other than a purpose built track car.

I personally would never go any higher than a 3.46 though... If I were to do it all over again i probably would have used a 3.38 actually since the install would have been easier and the difference is barely noticeable.
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Old 02-03-2009, 12:53 AM   #5
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hm ... it's common sense that the 3.62 is geared higher than the 3.46 so fake torque wise, jetskier88 does your car pull hard preferably in first and second, in comparison to other cars that you have driven what would you say it feels like? i went from having a 350z and would give anything for that throw you back in your seat feel again. what about you speeddemon?

ps - what vehicle would i even get a 3.62 out of and speeddemon you say a 3.46 would be less work? aern't all diffs (2.93,3.07/,46,62,91) a direct bolt on? i think the only one that's different is the 3.38 which comes out of the x3 and that's only for 330's due to our driveshafts being too short and not having a six bolt pattern? i don't know kpeng covered that install plus you have a 3.46 lsd ...

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Old 02-03-2009, 01:28 AM   #6
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Quote:
Originally Posted by tchavis1989 View Post
hm ... it's common sense that the 3.62 is geared higher than the 3.46 so fake torque wise, jetskier88 does your car pull hard preferably in first and second, in comparison to other cars that you have driven what would you say it feels like? i went from having a 350z and would give anything for that throw you back in your seat feel again. what about you speeddemon?

ps - what vehicle would i even get a 3.62 out of and speeddemon you say a 3.46 would be less work? aern't all diffs (2.93,3.07/,46,62,91) a direct bolt on? i think the only one that's different is the 3.38 which comes out of the x3 and that's only for 330's due to our driveshafts being too short and not having a six bolt pattern? i don't know kpeng covered that install plus you have a 3.46 lsd ...

regards,
tyler
ahhh im boosted so i always feel a "throw back in your seat feel" lol.... if the tires/road is cold i can break traction all the way through 1st and half way through 2nd... but at good conditions, where the tires stick, its a neck breaker

oh did i mention i had LSD? anyways..

but to add to what speeddemon said going to a 3.62 would be difficult as i did a complete rear end M3 drivetrain swap. this included the OEM M3 LSD diff, axles, driveshaft, sway, and subframe cage..
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Old 02-03-2009, 01:48 AM   #7
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yea all you're doing is making me jealous ... kidding but while i'm capable of doing that (have the garage, the air tools, the car lift) i don't have that kind of money at the moment ... at least for that type of conversion. i'm trying to improve the look of my car but feel that with any aggressive ride an agressive setup is important but yes i saw after i posted you had an LSD so you two are both lucky. haha anyway back on topic, like i said an aggressive setup, i already ordered my headers, need to do something about my intake (pref an afe stage1 cai), and exhaust ... the kpeng special? i figured a diff would be something more noticeable along with headers so let's say jetskier88 that you wern't f/i and lsd (even though that's impossible with a 3.62) ... would you say that 3.62 would still give you that throw you back in your seat feel? i think i'm going to go with a 3.91 as i have a 6spd and cruise the speed limit in sixth gear (no more than 60mph) when on the highway, don't think it'd be that bad do you?

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Old 02-03-2009, 02:27 AM   #8
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I'd do it...but then I am a little "different".
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Old 02-03-2009, 02:29 AM   #9
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ahhh im boosted so i always feel a "throw back in your seat feel" lol.... if the tires/road is cold i can break traction all the way through 1st and half way through 2nd... but at good conditions, where the tires stick, its a neck breaker

oh did i mention i had LSD? anyways..

but to add to what speeddemon said going to a 3.62 would be difficult as i did a complete rear end M3 drivetrain swap. this included the OEM M3 LSD diff, axles, driveshaft, sway, and subframe cage..
What did that cost you and where did you get it installed ???
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Old 02-03-2009, 10:39 AM   #10
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What did that cost you and where did you get it installed ???
you sir are a thread jacker only kidding

but bbbuuummmppp ...

regards,
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Old 02-03-2009, 09:29 PM   #11
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3.91

I went from a 3.46 to a 3.91 on my automatic 323 and it definitely has more low-end grunt feeling. You will shift more often though in a manual which may get annoying. If your interested, I still have my 3.46 for sale. 3.46 might be better for a manual. Send me a PM if intersted.
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Old 02-03-2009, 10:51 PM   #12
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one more question before i take any plunges ... would i need to source the diff out of a manual x3 being that my car's manual as well or does it not matter? i'm guessing it doesn't as it's gearing and most manual drivers are getting their 3.46's out of auto 323/35/28's. but silver323 pm sent though am completely set on the 3.91.

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Old 02-05-2009, 04:07 AM   #13
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3.46 ratio at the very most IMO.
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Old 02-05-2009, 08:34 AM   #14
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3.46 ratio at the very most imo.
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Old 02-05-2009, 12:47 PM   #15
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anyone have a spare 3.91 for my auto.
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Old 02-09-2009, 12:57 AM   #16
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With 3.91, your 6th gear would be something between your current 4th and 5th gear.
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