Lsd

[landis]

I just installed my LSD last night. Wow what a difference. The car is so much more fun. The real test will be this weekend at the Glen. Tobad the limited slip is not an option from the factory.

[mryakan]

You don't mention which car, but I am assuming it is a 335i? Is it an e90 or e92?

[landis]

I suppose I should put together a signature with a car description in it, but it is a 2088 335i e92 with a welded diff. Or it did have a welded diff and now it doesn't.

[mryakan]

Which LSD did you get? The more info you post the more useful it is for folks looking to do similar things. Also any detailed feedback esp. on the track would be great, so be sure to come back and post your impressions. You are pretty much a pioneer (or one of a very few) in this area.

[landis]

The diff is from Koala mortorsports. When they found out that the diffs were being weled the bought up as many as they could find. I explored two other avenues. First was getting a used diff that had a bolted ring gear. It wasn't to hard to find as the diffs that are welded seem to have different part numbers. Then use that to install a limited slip in. Second was to go through diffsonline. He was able to supply a quaife setup from England. I didn't look into that very much cause I wanted a clutch style instead of the quiafe. I was lucky and got refered to Koala Motorsports and they sold me one and I just ate the core charge. They knew I had no core when I bought it. They had ten when I bought mine. It is 40% lock which is a lot on the street. You can definetly feel it in slow speed sharp turns like pulling into a parking space. So one of the biggest differences is when you accelerate and spin both rear tires the DTC doesn't notice until the difference between the front and rear wheels is enough. Before it would clamp down much earlier as one rear wheel spun and the other didn't. The weight transfer to the rear is much more pronouced and unsettles the car in hard corner acceleration when the DTC kicks in. I drive on the street with the DTC on. The rear end loads and unloads as the DTC allows and removes engine power causing the rear end to hop. I tried it with one push of the DTC and it elimitated this charateristic. The biggest difference I notice is the amount of traction under power that I have.

[azhrei]

Great post; lots of information.

Any future impressions you have are certainly welcome! I'm fairly happy now with the electronically control setup that comes stock, but down the road maybe...

[Corky71]

I suppose I should put together a signature with a car description in it, but it is a 2088 335i e92 with a welded diff. Or it did have a welded diff and now it doesn't.


A 2088? Wow that must literally fly and go 0-60 in about 1.9 seconds! JK :D

Congrats on the LSD, if I weren't leasing I would look into that myself. Car must be a blast to drive. :buttrock

[Blue330i2006]

MMMMMMMMMMMMMM......

Need more info. pics.. reliability... this is the first "welded" i have seen. If welded there is no slip and acts like a sprint car rear end.

Actually I don't believe it.

[azhrei]

Hey, love the Nurburgring picture in your sig. Have you been there? I rented a yellow 911 when I was in Germany back in the mid 90's and took it out on the 'ring (against the rental contract rules, of course). Scared the sh*t out of me with the Porsche being so rear-end heavy and me not being familiar with the car -- I only had it 3 days 'cuz it was $300/day!!

Sorry for the thread hijack. It's the first time I've seen that signature picture. :)

[InHgX2]

MMMMMMMMMMMMMM......

Need more info. pics.. reliability... this is the first "welded" i have seen. If welded there is no slip and acts like a sprint car rear end.

Actually I don't believe it.


It is not what you are thinking...read this thread

http://forums.bimmerforums.com/forum/showthread.php?t=964148&highlight=lsd

[landis]

Right the ring gear is welded to the diff, it is not weld making the diff inoperable. I just finshed 3 days at WGI with the car. All I can say is WOW. The lsd make this car so much more fun to drive. It allows you to get on the power early and hard. The only problem I found was it is very hard to induce oversteer. I had nt-01 in 235/40/17, pcf 01 brakes and the lsd. The rest of the car is stock. The rear srings are so soft that when you get on the power the rear squats so much that the car understeers. So I had to throttle steer the car quite a bit. I cannot believe how fast this car is. I was faster than stock e46m3 with tires and brakes. Anything with a suspension in it was pretty much faster just because of the higher cornering speeds. I was able to get over 140mph at the 600 brake marker entering the bus stop. I was able to not touch the brakes until the 450 mark and make my turnin at about 80 for the bus stop, sorry inner loop. If you have any questions about the track experience please ask. The LSD is the most fun upgrade for the car.

[galahad05]

Great post landis!

It's stuff like this that keeps me coming back for more...

[diffsonline]

Just finished redesigning my salisbury (clutch style) carrier btw. We have 15 brand new 3.46s in stock and a couple 3.08s all with bolted ring gears so we can offer the Quaife (one left), a 3 disc 40% carrier, or we ar enow an OS Giken distributor. All great solutions.

Just figured I would throw that in there! We have also done a few of the 3.46 upgrades in the 135s and its a nice gearing upgrade for the manuals.

[ClarkGriswold]

Is there any downsides to the LSD?

[diffsonline]

Is there any downsides to the LSD?

None

[landis]

I haven't found any downside. The only thing I would highlight is the traction control act a little different because the rear wheels don't spin at different rate so the traction control doesn't clamp down quite as quickly. I really like it. I really really like it. It has transformed the feel and fun of the car. I defintely use more throttle because of the increased rear grip. Even though it is expensive the change over is worth it. I installed the diff myself. It took me four hours. This include time to modifiy some tools to fit the car.

[mryakan]

Is there any downsides to the LSD?
Cost, warranty.

[jfboy]

None of these cars came with LSD ? even the 335i ?

[mryakan]

None of these cars came with LSD ? even the 335i ?
Nope, only M3.

[jfboy]

Nope, only M3.

Damn youd think they'd get have gotten their sh@t together with this generation.

[mryakan]

Damn youd think they'd get have gotten their sh@t together with this generation.
I think the demographics that cares or even knows what an LSD is is too small for BMW to care about. But there was talk that it was going to be offered as part of the BMW performance catalogue.

[duncan17]

[quote=landis;12965176]I didn't look into that very much cause I wanted a clutch style instead of the quiafe. I was lucky and got refered to Koala Motorsports and they sold me one and I just ate the core charge. They knew I had no core when I bought it.

Why did you want a Clutch style instead of the Torsen/Gleason style? I really want to do this to mine!

[landis]

I had the oppurtunity to drive a mini cooper s with a quaife in it and a miata with a torsen. I felt that neither of those hooked up as well as the clutch style. Plus it is easy to change the clutch percentage with the addition or deletion of clutch plates. Also the clutch style is what I have in two of my other cars so it is what I am familiar with. This is the best upgrade you can do to these cars. I never understand why people are adding power to the cars when the car is already traction limited. Plus even with the traction control on you can still throttle steer like crazy because the rear wheels don't generate a large differential speed. It isn't until you get to much yaw that the babysitter clamps down. Put the LSD in. Also if you are close to me I will happly help you. I did it solo and it is a piece of cake.

[Blue330i2006]

Will the M3 diff work in E90?