E46 OS Giken Super Lock Limited Slip Differential Unit

[danewilson77]

Is anyone here currently running with this?

http://www.turnermotorsport.com/p-1383-e46-e39-e9x-z4-os-giken-super-lock-limited-slip-differential-unit.aspx

http://i1015.photobucket.com/albums/af278/nicee46/Maintenance%20and%20Misc/drivetrain_e46_328i_328Ci_330i_330Ci_limited_slip_ differential_bmw_LSD_OS_Giken_BM235-HA_2.jpg

http://i1015.photobucket.com/albums/af278/nicee46/Maintenance%20and%20Misc/drivetrain_e46_328i_328Ci_330i_330Ci_limited_slip_ differential_bmw_LSD_OS_Giken_BM235-HA_1-1.jpg

[Vas]

I am interested in knowing as well especially since it does not work on (3.07, 2.93 or any ratios lower than 3.15) which is the ZHP.

Turner used it with a 3.64 final drive on their ZHP.

[danewilson77]

I am interested in knowing as well especially since it does not work on (3.07, 2.93 or any ratios lower than 3.15) which is the ZHP.

Turner used it with a 3.64 final drive on their ZHP.

Right. That's for auto....but they used it in 6 speed.

[Johal E32]

For that kind of money, why not swap in a E46 M3 subframe and 3.64 LSD?

[danewilson77]

For that kind of money, why not swap in a E46 M3 subframe and 3.64 LSD?

Right. Just asking if anyone has this.

[Vas]

Right. That's for auto....but they used it in 6 speed.

It would be nice to run a 3.46 final drive and this.


For that kind of money, why not swap in a E46 M3 subframe and 3.64 LSD?

In the end, clutch type based lsd units are preferred since they have a fixed preload on the clutch pack and therefore a fixed amount of slip. The e46 M3 unit is fairly similar to a Torsen diff and is variable.

[sillieidiot]

i wanted that too. i think in my research there were guys running it on e46fanatics. then there were a bunch of hpf owners that swapped out their m3 diffs for it.

[Johal E32]

Right. Just asking if anyone has this.

Got it.

[kpro]

I have the OS Giken superlock in my 135, had it installed over last weekend. I got the car back and its one HELL of a difference :) mine is also 3.07

I was going to go with a quaife, but as I listened to the man at VAC Motorsports talk about how it won't help wheel lift situations, I decided to spend the extra and get the OS-G. My driveway is built funny and I lift the right rear wheel pulling in and my car gets stuck or spins the wheel, so I wanted that to be rectified when changing out the dif. There have also been on-track situations where you get wheel lift, so going with the quaife unit wouldn't suit me properly.

[M0nk3y]

I have the OS Giken superlock in my 135, had it installed over last weekend. I got the car back and its one HELL of a difference :) mine is also 3.07

I was going to go with a quaife, but as I listened to the man at VAC Motorsports talk about how it won't help wheel lift situations, I decided to spend the extra and get the OS-G. My driveway is built funny and I lift the right rear wheel pulling in and my car gets stuck or spins the wheel, so I wanted that to be rectified when changing out the dif. There have also been on-track situations where you get wheel lift, so going with the quaife unit wouldn't suit me properly.

The '08 doesn't have the welded diff does it? IIRC the 09+ 1 series have a welded diff and only VAC Motorsports or similar can do the work.

As well, you don't even need wheel lift. As long as you get weight transfer enough you'll start spinning wheels.

[derbo]

"The Variable M Differential Lock functions according to a simple principle: The difference in rotational speed that builds up between the two drive wheels whenever one of the drive wheels loses grip, either because it has become unloaded or hit a slippery surface, generates pressure spontaneously in an integrated shear pump. This pressure is then conveyed via a piston to a multiple-plate clutch, thereby channeling power to the wheel with better grip."



Is this true for the M diffs?> variable lock to 100% ?

[derbo]

Dane, I've thought about this diff with a 3.46 diff. It wouldve been very nice setup :D

[Sockethead]

The '08 doesn't have the welded diff does it? IIRC the 09+ 1 series have a welded diff and only VAC Motorsports or similar can do the work.

As well, you don't even need wheel lift. As long as you get weight transfer enough you'll start spinning wheels.

There are a bunch of places that can machine off the welded ring gear. They machine it off and drill it for bolts. We went to VAC because its only 20 minutes from our house and they already had a unit built and they are having a sale

I think your missing what she is saying. If one wheel loses total traction. or lift a wheel off the pavement, which does happen at the track, the Quaif diff will spin that wheel. The diff only drives both wheels as long as both wheels have some kind of traction This is why serious track people use something like the OS Giken...For most people the Quaif will do just fine...

The diff I bought off of Stewart is a modified BMW LSD machined to fit the standard e46 diff. It has custom ramping and clutch packs and is a 3.46. As soon as I get a chance to install it, I'll let you all know how it performs...

[Mtnman]

:idea

Thanks for the knowledge drop. We need a knowledge drop icon with an encyclopedia or something

[Vas]

Dane, I've thought about this diff with a 3.46 diff. It wouldve been very nice setup :D

This is what I will probably end up doing.

[Sockethead]

Oh I forgot to mention that the OS Giken takes special oil that costs $50 a liter and it takes 1.5 liters. Also, the recommended change interval is roughly 12K miles so it's a little costly to maintain.

Edit: and it's Japanese... some of you may care about that but Kpro is an X Honda girl, she could care less

[Vas]

Actually regular fluid service is recommend with the os giken LSD.
However the first service is right before the 2k mark.

[derbo]

This is what I will probably end up doing.

jealous :)

[az3579]

Oh I forgot to mention that the OS Giken takes special oil that costs $50 a liter and it takes 1.5 liters. Also, the recommended change interval is roughly 12K miles so it's a little costly to maintain.

Edit: and it's Japanese... some of you may care about that but Kpro is an X Honda girl, she could care less

Awesome. That crosses it off my list. Not doing a fluid change every 3 months. :shifty

Sent from my DROID RAZR MAXX HD

[Sockethead]

Yea, don't blame you there... Kpro's is pretty low mileage so we can figure on diff oil changes once a year or so.

[danewilson77]

Actually regular fluid service is recommend with the os giken LSD.
However the first service is right before the 2k mark.

Elaborate. We have info conflict here.

[zhp43867]

I talked with a BMW diff builder and he basically said that OS Giken is the best of the best. He also builds/rebuilds M-variable units as well as more basic clutch based LSDs like those found in the E30 and E36/E36 M3.

FI M3 guys with traction problems frequently upgrade to OS Giken. However, it is a bit pricey once it's installed and done.

Edit: Looks like OS Giken may be noisier than a differential like a Quaife.

[Sockethead]

Elaborate. We have info conflict here.

He's repeating what I already said. I was going to comment but I let it go.

Bottom line is when the unit is first installed, your first fluid change is around 1800 miles. After that its around every 12k. Recommended fluid is $50 per liter. It takes 1.5 liters so your first oil change will cost $100 and you second will be $50 because you have half a can left over... So on and so on.

I can tell you all that Kpro's OS Giken is silent... If it was going to make noise it would be doing it now before it's broken in...

[kpro]

Steve at VAC also said that the OS Giken is very silent compared to most. They only sell 2 brands, OS-G and Quaife. Reason for this is that they are the best and he doesn't like to sell sub-par brands or parts for that matter. Quaife requires far less maintenance, but if you do professional racing with your car, the wheel lift could be an issue there...

Before my install my car would lift the right rear wheel due to the approach angle I have to use just to get up the driveway without trashing my front splitters. Lifting that wheel created a little bit of an issue. The quaife wouldn't have helped this becuase without traction on that corner it wouldn't spin the left wheel either, leaving me in the same predicament. This and wheel lift at the track is why I went with the OS-G. Quaife's are very nice diffs. I had put many of them on Hondas and seen over 100k miles with no issues. Quaife has a lifetime warranty as well.

[terraphantm]

It would be nice to run a 3.46 final drive and this.



In the end, clutch type based lsd units are preferred since they have a fixed preload on the clutch pack and therefore a fixed amount of slip. The e46 M3 unit is fairly similar to a Torsen diff and is variable.

E46 M3 diff is clutch based. It has a shear pump that can vary the lockup via pressure, but the lockup itself is still done by clutch packs.

[Secono330ci]

I have the OS Giken Superlock 1.5 way with a 3.64 ratio. Love it.

[wertyu78]

I just purchased one. It will be going in my 3.64 diff. I will likely post an OS Giken LSD install with step by step directions. Can't wait to be 2 wheel drive...

[derbo]

I can't wait to see the progress on this unit build! :D

[///Mvious]

This unit with a 3.38 or 3.46 is on my future mod list!