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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 11-01-2009, 06:17 PM   #1
M3TA5IN
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Diff question? Overall performance questions

Ive been searching the forum for information on upgrading the performance of a 330i. I am currently searching for exactly what I want, I'm very particular so its taking me some time...

Anyway, I come from the jeep world so I am very familiar with swapping gears, axles, lockers etc etc. I see that a lot of you guys swap out your "whole" diff? and its an expensive upgrade?

I am assuming you are just taking the whole casing and swapping it for one with higher gear ratio. How exactly does the diff work on a bmw? What the cost of just swapping a diff? Its nothing to have 5k to 10k wrapped up in a jeep axle.

Also I am interested in looking into SCCA racing stuff, any advice on setting up a car for that would be helpful. Nothing serious at first, just want to get into it.

Would a 330i not be ideal for track opposed to a 330ci?

Thanks in advance.
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Old 11-02-2009, 01:26 AM   #2
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Just just swap the whole unit - case, gears, etc.

If you want to race, then you will want to get an LSD which costs about $3000 depending on your final drive ratio. I think diffsonline just dropped their prices. I would add a finned diff cover. Looks cool and is functional.

Its pretty straight forward swap in a new diff.
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Old 11-02-2009, 10:19 AM   #3
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^werd. LSD units range from ~$1200 for the cheaper quaife and kaaz units up to $3kish for the better units. If you just want to change the ratio, look for a diff from an auto e46 (which would get you 3.38, 3.46, or 3.64 depending on which car it came out of).

The sedan is arguably stiffer than the coupe. In any case, it's just as good for the track as the coupe is.
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Old 11-02-2009, 11:44 AM   #4
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Thanks for the info guys.

Ideally the higher ratio well give you better accleration, correct?

In jeeps we generally go higher to compensate for bigger tires, better up hill pull. I have 4.56s in my jeep
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Old 11-03-2009, 05:35 PM   #5
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For the most part, yes. But go with too short a ratio and you'll be constantly shifting.
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Old 11-03-2009, 06:24 PM   #6
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Look around for a 3.46, that's about the highest we can comfortably swap.

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Originally Posted by M3TA5IN View Post
Thanks for the info guys.

Ideally the higher ratio well give you better accleration, correct?

In jeeps we generally go higher to compensate for bigger tires, better up hill pull. I have 4.56s in my jeep
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Old 11-04-2009, 12:42 PM   #7
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Now what about axles? Is it common to swap shafts in a bmw? For like stronger shafts like on a track or something? Im really trying to understand a bmw driveline so I can relate it to what I know with working jeeps and get an understanding
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Old 11-04-2009, 12:46 PM   #8
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There are no aftermarket half shafts that I know about for our cars, and you really won't need them anyways.

If you plan on tracking the car, it's a must that you have the rear floor where the subframe mounts reinforced. Turner Motorsports and HPF both sell reinforcement kits for this. You might also want to change your guibo out for an M3 guibo.
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Old 11-04-2009, 12:52 PM   #9
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There are no aftermarket half shafts that I know about for our cars, and you really won't need them anyways.

If you plan on tracking the car, it's a must that you have the rear floor where the subframe mounts reinforced. Turner Motorsports and HPF both sell reinforcement kits for this. You might also want to change your guibo out for an M3 guibo.
What is guibo?
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Old 11-04-2009, 01:03 PM   #10
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What is guibo?
Also known as the flex-disc, it's a rubber disc that connects the drive shaft to the transmission output.
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Old 11-04-2009, 02:25 PM   #11
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Also known as the flex-disc, it's a rubber disc that connects the drive shaft to the transmission output.
interesting, kinda like a yoke? or a CTM joint? and its made out of rubber?!?

do you have a picture of this?
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Old 11-04-2009, 02:50 PM   #12
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interesting, kinda like a yoke? or a CTM joint? and its made out of rubber?!?

do you have a picture of this?
http://forum.e46fanatics.com/showthread.php?t=714925
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Old 11-04-2009, 03:06 PM   #13
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Thank you very much
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Old 11-04-2009, 05:59 PM   #14
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Quote:
Originally Posted by Activ3 View Post
There are no aftermarket half shafts that I know about for our cars, and you really won't need them anyways.

If you plan on tracking the car, it's a must that you have the rear floor where the subframe mounts reinforced. Turner Motorsports and HPF both sell reinforcement kits for this. You might also want to change your guibo out for an M3 guibo.
http://www.m3post.com/forums/showpos...10&postcount=7

I really don't know if this happens a lot but at least the video is entertaining.
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