LSD's...again

[wootloops]

Originally Posted by spidertri

I looked for reviews on the new version of that diff for months. Could never find anything definitive. Seems like some Honda guys are using it but not much from BMW applications.

I even emailed MF and they just told me that it has multiple ramp profiles machined into the pressure rings and that it's driveable on the street. I'm not sure what the 50% reduction in NVH claim meant because it's 50% of what? Videos I found of the V1 were incredibly noisy sounding so it really didn't give me a good feeling that the V2 would be quiet.

I can say that my 4 clutch diff is silent on the street. I didn't go for super aggressive ramp angles because I wanted it to be somewhat civilized and have a not as abrupt lockup. But it still locks very quickly when there is any unloaded wheel slip.

Interesting. My 128i is going to be a dedicated track toy so I can deal with some level of noise. I may be willing to take one for the team and try it out but that probably wont be for a few months.

[dmytro98]

The v2 mfactory clutch type lsd is what I'm planning on going with simply due to how much cheaper it is to any other option and just taking a risk on the noise. Will try to document as much as I can but that won't be until jan/feb

[carguy138]

Can anyone share some feedback about how much maintenance these clutch based LSDs need?

I'm between the Mfactory 1.5W clutch (6 springs for about 60% preload) and diffsonline 35/60 3 clutch. Really want a clutch based LSD for predictablity but don't want to have to rebuild it every year. Frequent oil changes I'm good with.

I've emailed a few venders but still don't have a good idea how often plates and springs need to be replaced. I completely understand this all depends on usage but just looking for a general idea of what to expect. Also is there a big difference in maintenance intervals between street friendly clutch LSD setups?

6-8 HPDE per summer and light street use. 5-7k miles per year, no drifting. I'm very easy on the car to be honest.

[spidertri]

I was told, change oil 500mi after installation. Then change oil every 2 years or 5 track days, whichever comes first. He gave me a list of oils to use, I'm running Motul Gear Competition 75w-140.

Clutches should last 30k mi before needing to be replaced with normal driving and track day usage. If doing endurance racing then things would need to be replaced more frequently.

[tsk94]

Clutch wear will depend on use (no kidding) and the number of clutches. A 4-clutch diff will require more frequent rebuilds than a 6 or 8 clutch diff. Depending on usage, 30-50k miles of mixed street and track use is fairly typical depending on which diff and the # of clutches.

I suspect you'll get 4-5 years before needing a rebuild carguy138

[carguy138]

Thanks guys. Ended up ordering a Wavetrac. Looking forward to it!

[gldnhr]

Good info, ive been considering wavetrac over clutch... have to think about it a bot more

[SFPirate]

Lots of talk about Clutch vs Helical and Wavetrac, but if I were to go with a Helical, which is better, Wavetrac or Quaife? What are the pros and cons of each?

Also what about gear ratios? I have a 2013 E82 135is with DCT and a bunch of mods and MHD. I believe the stock Ratio is 2:56, and the other option is 2:81, which should be quicker. Anyone running the 2:81 vs the Stock ratio?

Thanks!