M-Factory LSD for E85/E86

fearless

Member
M-Factory Limited slip differential fitted with a 3.07 ring gear and in a 188k housing. So should bolt directly into most E85/E86/E46.

This thing transforms a Z4, they really should have been fitted at the factory. The M-factory diff is impressive, equal in quality to a Quaiffe, and has been faultless in my ownership.

Originally supplied by Grinspeed, the UK M-factory dealer, they are about £900 new for the unit, before you get it fitted into a housing.

This is ready to go, you could bolt it in on your drive in 3hrs or so.

Difficult to photo a diff, but I’m more than willing to crack off the rear cover for interested parties to inspect it if they want.
 
Ag51bye said:
Very interested,Do you know how miles it’s covered?

LSD has covered about 40k miles, Faultlessly. The casing has a total mileage of about 100k. The LSD is helical, like a Quaife, so no clutch packs to wear out.
 
Just to throw it out there fitting an lsd to my old si coupe was one of the best mods I did - much better grip, more transparent at or past the limit and a right hoot on snow days :lol: I got a right bollocking from the work security manager for getting in early and drifting the business park one way system in the snow last Feb :rofl:

So yes in summary highly recommend this mod to anyone on the fence about it - works seamlessly with the cars dtc, and really tangibly improves the drive!
 
fearless said:
C8H18 said:
Is this pick-up only, or could it be courriered?

Preferred pick up, but could be posted at £30 as it weighs about 35kg.

Thanks. I can afford £500 (delivered) if that's of interest to you. I fully understand if you'd rather hold out for more.
 
C8H18 said:
fearless said:
C8H18 said:
Is this pick-up only, or could it be courriered?

Preferred pick up, but could be posted at £30 as it weighs about 35kg.

Thanks. I can afford £500 (delivered) if that's of interest to you. I fully understand if you'd rather hold out for more.

A kind offer, thank you. I’m going to hold out for the asking price for a while, but will let you know if I reconsider.
 
Simon 3.2M said:
Is this better than the diff supplied in the M from the factory?

Better is somewhat subjective I guess. They are two different types of lsd. The Oem diff in the M cars is a plate diff as far as I understand. These are good as they should still lock if one wheel has zero traction, but over time the friction plates will wear and locking ability will suffer and eventually fail. The M-factory/Quaiffe diffs are helical worm gear units, and as such can never really wear out. The shortcoming is due to the lack of preload, they struggle to lock if one wheel is in a zero traction situation eg ice, wheel hopping etc. In my opinion, plate diffs come into there own on track, while helical gear diffs are ideal for road applications.
 
I'll pay your asking price depeding on how much it will cost to send to Australia. Postcode 6064

Edit: just realized 3.07 ring gear. Is this the final gear? My 3.0si is currently 3.64 final gear. What effect would this lsd have to gear ratios if fitted?

Edit2: Can an LSD be fitted to an automatic transmission? I have no idea how any of this works...
 
pwnsweet said:
I'll pay your asking price depeding on how much it will cost to send to Australia. Postcode 6064

Edit: just realized 3.07 ring gear. Is this the final gear? My 3.0si is currently 3.64 final gear. What effect would this lsd have to gear ratios if fitted?

Edit2: Can an LSD be fitted to an automatic transmission? I have no idea how any of this works...

Hmm, quick quote for posting to Aus came in at £180...........

Yes, 3.07 is the FD ratio. Fitted as is, it would lengthen your gear ratios, sadly. The 3.07 was a pre-facelift manual ratio.

LSD’s certainly can be fitted to automatics, with all the benefits of additional traction and more predictability beyond the limit.
 
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