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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 07-12-2010, 10:00 PM   #1
sgplayer69
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330ci limited slip differential

Hey all, i got 2 questions...I'm new to differential setups so bear with me!

1) I've seen all the housing together of an LSD, but can you just buy a LSD unit by itself (since it's cheaper), and swap it for the open differential unit in the housing? would I need to buy anything else to make the conversion, if possible?

2) If this is possible, which differential unit is the best for a 330ci with the ZHP package? Price:quality ratio is kinda important

Thanks,
Nick
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Old 07-13-2010, 10:09 AM   #2
Jim Murphy
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LSD's on E46 ZHP Thread

All your questions have already been answered on this thread further down the postings:
http://forum.e46fanatics.com/showthread.php?t=771375

You will see that the aftermarket LSD is the way to go.

Jim
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Old 07-13-2010, 05:09 PM   #3
sgplayer69
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so for example: http://hpashop.com/product.sc?produc...categoryId=114

Would I just simply swap that unit in place of the open differential unit? or do other modifications need to be made?

Also, could someone explain this to me:

"The Quaife is great for street driving or racing. Racers don't have to put up with locking mechanisms or spools that tear the steering wheel out of their hands when cornering. Because it behaves like an open differential during ordinary driving, street drivers will have trouble telling it's there until pushing the car's limits."

Does that mean the steering wheel will be all over the place if im using one hand??? lol

Nick
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Old 07-13-2010, 05:24 PM   #4
HP Autowerks
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Hi Nick,
Yes, the quaife goes in place of the open unit. You will need to reuse the ring and pinion.

I think that quote may be in reference to front wheel drive. I don't know how that would apply to RWD.

It is one of the biggest things along side with suspension and FI'd that will considerably make a positive change in how your car performs.
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Old 07-13-2010, 05:28 PM   #5
sgplayer69
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Quote:
Originally Posted by HP Autowerks View Post
Hi Nick,
Yes, the quaife goes in place of the open unit. You will need to reuse the ring and pinion.

I think that quote may be in reference to front wheel drive. I don't know how that would apply to RWD.

It is one of the biggest things along side with suspension and FI'd that will considerably make a positive change in how your car performs.
But that LSD is specifically made for the "e46 3-series," as said at the top. I don't believe that there are any FWD BMWs out there, let alone any e46s...
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Old 07-13-2010, 05:30 PM   #6
TxZHP04
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Quote:
Originally Posted by sgplayer69 View Post
Would I just simply swap that unit in place of the open differential unit? or do other modifications need to be made?
Yes, that is the "LSD" core which would need to be swapped into your carrier. This is not a DIY job for most as it is absolutely critical that the bearing pre-load and gear lash be set correctly.

Quote:
Originally Posted by sgplayer69 View Post
Also, could someone explain this to me:

"The Quaife is great for street driving or racing. Racers don't have to put up with locking mechanisms or spools that tear the steering wheel out of their hands when cornering. Because it behaves like an open differential during ordinary driving, street drivers will have trouble telling it's there until pushing the car's limits."

Does that mean the steering wheel will be all over the place if im using one hand??? lol

Nick
This comment is made with respect to front wheel drive applications and is of absolutely no relevance to your BMW.
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Old 07-13-2010, 05:30 PM   #7
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Ah, I see. I made that item description. I'll edit it now
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Old 07-13-2010, 05:49 PM   #8
sgplayer69
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Ahhh gotcha I was confused bc it didn't make sense for RWD! Thanks everyone
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Old 07-13-2010, 06:01 PM   #9
sgplayer69
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and also, I've heard you can use an M3 differential, but you need to make alterations to the car on top of it. If I just buy the M3 LSD unit by itself, can i swap it with the open unit without any alterations?
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Old 07-13-2010, 06:29 PM   #10
cnotesdip
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if you decide to get the m3 diff i would get the whole rear suspension this is what i did i got a rear m3 suspension for about $750 delivered, everything fit and you could even use the abs sensors from your 330 on the m3 rear end pretty easy if you have a lift.
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Old 07-13-2010, 06:40 PM   #11
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Originally Posted by sgplayer69 View Post
and also, I've heard you can use an M3 differential, but you need to make alterations to the car on top of it. If I just buy the M3 LSD unit by itself, can i swap it with the open unit without any alterations?
You need to install the whole subframe. The e46M3 has a 210MM input shaft, yours is 188MM.
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