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      09-04-2018, 03:10 PM   #1
Matticus91
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Question LSD Conversion Kit for 135i for $320???

Has anyone seen this kit or know anything about a conversion like this? For $300ish I'm tempted to just buy it out of curiosity...

https://www.ebay.com/itm/Bmw-E81-E82...FbPxOS&vxp=mtr
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      09-04-2018, 03:29 PM   #2
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You've piqued my interest...


Someone order it for science. Or a diff expert explain why this is a great/awful idea.
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Last edited by desertman123; 09-04-2018 at 03:36 PM..
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      09-04-2018, 04:23 PM   #3
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From the limited info I can find they seem to be targeted at the drift crowd. I'm no diff expert, but the theory seems reasonable. Durability is the obvious unknown. The diff in my 2002 needs to come out to be resealed anyway...hmmmm....
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      09-04-2018, 05:12 PM   #4
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I can't imagine inserting some cheap Chinese part for what puts power to the wheels being a good idea.
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      09-04-2018, 05:33 PM   #5
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Here is a link to their website & a couple of videos. The FAQ says their units require service every 2 years. Interesting...

https://www.racingdiffs.com/progress...nversion-sets/



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      09-04-2018, 05:43 PM   #6
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Quote:
Originally Posted by swunder View Post
I can't imagine inserting some cheap Chinese part for what puts power to the wheels being a good idea.
Me either... but this looks to be from Serbia. Can you judge quality or function with doing 5 min or research?

Nope. Do I think it's as good as as a full differential rebuild? Nope x2.

Do I think it's work if someone wanted to do burnouts around town to look cool on a Friday night? Probably.
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      09-04-2018, 06:22 PM   #7
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A 2 year service claim for a clutch diff is pretty reasonable. I've seen loads of different numbers (from 3k miles to 10k miles) so I do mine annually.

Honestly, a real LSD is 'only' $1k - $1.5k more... as with most things on our cars, if you're going to the trouble of removing the thing and rebuilding it, isn't it worth spending a bit extra and doing it right the first time?

On the flip side, welding your diff costs nothing and while it's a bitch to drive on the road, (I must say driving an aggressive race/clutch diff on the road isn't always fun) it would probably be more reliable, more predictable, and cheaper.
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      09-04-2018, 06:44 PM   #8
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Quote:
Originally Posted by desertman123 View Post
You've piqued my interest...


Someone order it for science. Or a diff expert explain why this is a great/awful idea.
I might contact them and see what kind of discount I can get, and give this a shot.

Quote:
Originally Posted by 02Pilot View Post
From the limited info I can find they seem to be targeted at the drift crowd. I'm no diff expert, but the theory seems reasonable. Durability is the obvious unknown. The diff in my 2002 needs to come out to be resealed anyway...hmmmm....
Do iittttttt!!

Quote:
Originally Posted by swunder View Post
I can't imagine inserting some cheap Chinese part for what puts power to the wheels being a good idea.
For $300 it might be worth the trial, if it toasts the diff I've seen new ones at my local yard for less than $200.

Quote:
Originally Posted by Gangplank View Post
Here is a link to their website & a couple of videos. The FAQ says their units require service every 2 years. Interesting...

https://www.racingdiffs.com/progress...nversion-sets/
Good info, 2 years is totally on point with most diff servicing


Quote:
Originally Posted by xQx View Post
A 2 year service claim for a clutch diff is pretty reasonable. I've seen loads of different numbers (from 3k miles to 10k miles) so I do mine annually.

Honestly, a real LSD is 'only' $1k - $1.5k more... as with most things on our cars, if you're going to the trouble of removing the thing and rebuilding it, isn't it worth spending a bit extra and doing it right the first time?

On the flip side, welding your diff costs nothing and while it's a bitch to drive on the road, (I must say driving an aggressive race/clutch diff on the road isn't always fun) it would probably be more reliable, more predictable, and cheaper.
Saving $1k alone is worth it to me, extremely reasonable price. ESPECIALLY if it works well.
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      09-04-2018, 07:12 PM   #9
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If you have a welded diff you're probably still gonna have to do a ton of work. Just get a real lsd.
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      09-04-2018, 07:12 PM   #10
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You get what you pay for as a rule, would personally rather pay for a proven set up.
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      09-04-2018, 08:16 PM   #11
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Certainly an interesting proposition...

I question how well it'd hold up to proper abuse, though.
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      09-04-2018, 08:20 PM   #12
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Tossed an email to the crew, with an interesting proposition. We'll see if they are interested! I think it could be beneficial to them if there was a general user who's installed/reviewed the product themselves.
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      09-04-2018, 08:44 PM   #13
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Normally I'd shy away from such things, but this has piqued my interest as well. East Euro engineering, beyond the hack job stuff, can be pretty impressive from what I've seen.
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      09-04-2018, 09:16 PM   #14
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If I had any interest at all in an LSD, I would do this in a second, especially on the lower powered 128i. What do you really have to lose at $300?
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      09-04-2018, 09:48 PM   #15
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I know I've been negative in this thread, and I don't know enough about engineering to comment on the design. It might be excellent value for money and provide 95% of the benefit of a clutch-LSD for 10% of the cost.

But I would highlight that is a 2-way diff with equal-lockup. This means it is going to lock the back wheels on deceleration and cornering just as much as it does on acceleration.

You'll want to do your own research about what that means on a street car, but I do have authority to say it is going to significantly change the cornering characteristics of your car - it is a substantial change from an open diff or helical diff.

If you were building a street car with an OS Giken LSD, I very much doubt '2-way equal-lockup' would be your first choice of diff configuration.

I'm pretty sure that's what you'd choose if you were building a drift-car that you wanted to drive home from the track.
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      09-04-2018, 10:56 PM   #16
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Officer: Get out of the car and walk this straight line for me.

Officer: Breath into this machine I have here.

Officer: How did you end up running in to this tree in broad daylight?

Driver: Officer, I can explain it to you. You see, I bought this new differential from Serbia and had it installed in my car. I was out driving here, minding my own business, when all of a sudden the wheels locked up and I tried to regain control but ended up running into this tree, which was better than hitting those kids in the crosswalk.

Honestly, if you're going to put this sort of control part into your car, buy the real thing, even if it's made for an M3 or some other BMW.
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      09-05-2018, 10:24 AM   #17
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Wait is this the car forum equivalent of a Red Rider BB gun?
[img]https://i.imgflip.com/wbad7.jpg[/img]

All joking aside, if someone is going to be the guinea pig, consider the risks.
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      09-05-2018, 01:55 PM   #18
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OK, I ran this thing past an experienced group of racers and builders. I have a much better understanding of how it is supposed to work, and where the weak points are likely to be.

It operates similarly to a Detroit Locker diff, at least in theory, which means this design is probably better suited to track use than street. Even though the basic design concept is sound, problems of materials and limited friction surface area creating excessive heat may contribute to a short service life. A lack of precision fitting between the gears and the friction plates without careful machine work only exacerbates this, suggest that results are likely to be less than optimal, especially over time.

I'm happy to be proven wrong on any of these points, but the group I brought it to was pretty consistent in their criticisms.
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      09-05-2018, 02:35 PM   #19
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Well well well then the jury has spoken and the verdict is?
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      09-05-2018, 03:03 PM   #20
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Quote:
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Well we'll well then the jury has spoken and the verdict is?
Hard pass.
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