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-   -   Upgrade Differential (http://forum.e46fanatics.com/showthread.php?t=881316)

Mike97528i6spd 10-21-2011 09:45 AM

Upgrade Differential
Hey all, i know im not an E46 but the E39 boards brought no answers. Since the Supercharger my 1st gear has been impossible to launch so I've been looking either into either the Quaife or OS Giken LSDs. Any advice?

murph1379 10-21-2011 10:20 AM

A Quaife will be great on the street, but will be worthless on the track. OS Giken are probably the best of the clutch diffs. If you go OS Giken, tell them what you're using it for, as the ideal settings for the track could suck when autocrossing, and drifting is another beast entirely.

Steven747 10-21-2011 11:25 AM

just get the os giken but be ready to shell out some serious cash i think.. try looking into wavetrac also

Mike97528i6spd 10-21-2011 11:38 AM

What about in regards to reliability, still the same?

Rob43 10-21-2011 04:30 PM

Where to start,

First lets throw out all the supposition that already might be in this thread.

I own & drive both a Quaife LSD equipped street car (330Ci) and a Diffsonline Variable Ramp-3 Clutch LSD for my 325i race car. That said, I won't be giving any supposition.

For street use you can't beat the Quaife. Maintenance free, no new noises, never needs to be rebuilt like a clutch type & always gives full traction unless one rear wheel is physically off the ground. If you go to a road race track, you may find that in really tight turns you'll get a little inner wheel slippage. But still much faster times on the clock when compared to an open diff. For a lot of autocross events I'd go with a custom diff from Diffsonline or an OS Giken. So if your on the street 95% of the time, the Quaife makes an excellent choice. When talking with any of these companies, tell them exactly how you plan on driving the car & what RWHP you have.

For Quaife, go here first & ask for a deal. Harold / owner.

For a custom setup or Quaife, Kaas or OS Giken. Dan / owner.

Good luck.

Jackcat559 10-25-2011 07:58 PM

OP, I also felt I had the same issue, and switch a few years back. With the S/C it has been a great package.

Mike97528i6spd 10-26-2011 09:21 AM

:thumbsup: Rob

Jim Murphy 10-27-2011 03:47 PM

+1 on the OS Giken LSD.
$1,800 plus install is not bad at all. I had the same problem as you with my SC - now I have been really happy with the OS Giken. Both rear tires now wear relatively evenly.


Nervous 10-29-2011 11:29 PM

Where did you get it for 1800? diffsonline offers diffs by wild prices (2.5K+)....

Rob43 10-30-2011 12:12 AM


OS Giken


But that is just the LSD unit, you still need to get it installed in the diff housing.

Nervous 10-30-2011 12:57 AM

Ah, I see. Is installation DIYable?

Rob43 10-30-2011 02:57 AM


Originally Posted by Nervous (Post 13749981)
Ah, I see. Is installation DIYable?


Anything is possible, but if you've never done it before, I wouldn't. Most consider it difficult, they need to be properly "shimmed". Kind of an art form.

You really want a mechanic who you KNOW has done plenty of LSD installs before. Once you get it back, you can save money by installing the diff housing in your Bimmer yourself.

So a Quaife (cheapest) plus shipping, plus a 3.15/3.23/3.38/3.46 used diff (if yours is a 2.93 or 3.07), plus labor = a bare minimum of $1800. Pray you don't need new bearings, $300.

Anyway, that's why most LSD's cost $2000-$3000 without blinking an eye.

Good luck.

Jackcat559 10-30-2011 06:10 AM

I got mine a few years back for $2100 from Performance Gearing. They shipped a complete unit, that just needed oil. It took a couple hours to swap.

Nervous 10-30-2011 11:11 AM

I actually found several DIYs of LSD installation (for 370z, merc, 1-series), sounds completely doable. Not sure about shimming (didn't see anything about it in those DIYs.

Actually, looks like swapping whole M3 rearend gonna be a much cheaper option...

Nervous 10-30-2011 11:13 AM


Originally Posted by Jackcat559 (Post 13750200)
I got mine a few years back for $2100 from Performance Gearing. They shipped a complete unit, that just needed oil. It took a couple hours to swap.

Now they sell them for $2,250.00 (http://www.performancegearing.com/pricing.php). Also an option, thanks!

Nervous 10-30-2011 11:28 AM

BTW, the OEM M3 LSD diff is what type? Is it like maintenance free, like Quaife or it wears like clutch type?

Jackcat559 10-30-2011 01:06 PM


Originally Posted by Nervous (Post 13750502)
Now they sell them for $2,250.00 (http://www.performancegearing.com/pricing.php). Also an option, thanks!

this was my first big DIY project starting out. It's actually pretty easy to do. Just a bit heavy.

Not too sure about building an entire unit, having to shim ans stuff

Nervous 10-30-2011 01:53 PM

Yeah.... What kind of diff they use for their rebuilds? Quaife or something else?

I'm just trying to figure out is LSD worth of 2-3K or not.... I am not tracking my car at all....

Mike97528i6spd 10-31-2011 10:45 AM

This Video is what got me excited


murph1379 11-02-2011 05:28 PM

OE M3 is a clutch-type, as are the Performance Gearing units.

I have a Performance Gearing LSD in my car, and I love it.

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