100% Custom LSD's From Precision Gearing!

[nmlss2006]

Wait wait wait. Then how come people here get away with asking me $500 for a rebuild WITHOUT touching the locking (bearings and seals) with me providing the parts? Would Rob possibly be interested in doing rebuilds also?

[328ijunkie]

with ramp angles have been changed to 45deg, increased lockup with stock 2 clutches can be achieved.

also spacers and preload.

EVEN Viscous LSD can be modified from stock with stock parts from 1 way to 1.5 or 2 way, reference VLSD R200 unit in Nissan S13/14/15, J30, etc etc. VERY COMMON in drifting world :) - CHEAP too.

a shim kit to make a stock VLSD nissan unit go from 1 way to 2 way is less than $20. DEALER OEM GENUINE PART!

OEM bmw did a bunch of center units that varied the lockup.

besides the OEM 25% 2 disc

there is OEM 4 disc 40%
oem 4 disc 75%

you can reference and dig through dealer info dating back to 1960's for this BMW info.

ZF diff history is back to PORSCHE, this is a unit with a LOT of history and ancient DNA.

I was under the impression stock ramp angles were 45deg

And of the 30-40 diffs ive torn down (E30/E36/E46/E34/E32/etc) ive never seen anything other than 2 clutch with 45deg ramp angles and similar preload (dont remember measurements). Ive seen a few with thicker spring plates but they also had thinner stack washers to keep preload roughly the same.

But thats just what i know.

Ninjaedit:
And just to add, ive never personally tried upping the preload for a number of reasons (biggest of which this company has solved with their custom end cap, the small ears for the end cap like to snap off), other of which i would assume the clutches would wear alot faster, esp when theres only two of them. But again this is just what ive gathered, never tried anything like that myself.


Also those polished gears look hawt.

[Overlord475]

Wait wait wait. Then how come people here get away with asking me $500 for a rebuild WITHOUT touching the locking (bearings and seals) with me providing the parts? Would Rob possibly be interested in doing rebuilds also?

I believe that Wanganstyle was talking about Viscous LSD's not Clutch Type LSD's.

And a rebuild is basically what Rob is offering us here. He is sending you a new Dif and you're sending your core in. Though there are only a few stock parts used in his Difs while everything else is custom.

[nmlss2006]

He was, but you are not: the thing is, I already have the ratio I want, so I wouldn't need the new set of gears (which is where most of the machining cost is), nor would I need modified ramps etc. Taking this to PM.

[Overlord475]

I understand that completely.

PM responded to

[Overlord475]

Bump... I need a new LSD soon. Let's get this thing going!

[Overlord475]

ttt

[Gooch]

I'd be all over a 3.15 if I had the cash. Good luck with the group buy.

[Overlord475]

bumpty

[IDM]

Has anyone bought a differential from these guys? I see them on ebay all the time advertising stuff they say they are out of stock off but are their rebuilt diffs any good?

[Wanganstyle]

I believe that Wanganstyle was talking about Viscous LSD's not Clutch Type LSD's.

And a rebuild is basically what Rob is offering us here. He is sending you a new Dif and you're sending your core in. Though there are only a few stock parts used in his Difs while everything else is custom.

Nobody wastes time dealing w viscous LSD units. I sure as hell don't. Viscous is games poor Nissan drifters play.

I remove a lot of bmw Oem m-variable LSD units from e46 cases for full clutch LSD conversion and build ups. The GKN VISCO-LOK units (m-variable) are both clutch and viscous actuation; always removed for high performance e46m diff setups as the viscous unit dies under track stress.

Have gotten more than a few Inquiry's from r3v members with history w/ precision gearing units. Specifics are undisclosed; they can voice themselves.

I have more Oem supply chain knowledge and depth than most anybody; that's why I have Oem 4 clutch 40% asymmetric 1.5way unsprung LSD units avail. Bmw shipped 75% locking 4 disc sprung units in specific cars stateside also but those are rare birds.

I do fully built Oem lsd units to high lock 4 clutch setups mostly for 210mm cars (46m3) and OS Giken superlok for the competitive 188mm/210 cars. Very popular in NASA GTS-3,4,5

When the price point is expanded to include custom ramps and top caps it is cheaper in the long run for the customer to choose a BRAND NEW OS Giken LSD build. Usually about a second per lap faster as well compared to a fully built up OEM LSD. Pointless to spend similar money on tuning the 1970's technology ZF unit if the budget overlaps.

Even with the proprietary metal matrix internals I use the OEM diff built up in any spec cannot touch the Giken superlok LSD.

Os Giken= sheer technological advancement in durability and anti-lock up design to the center section.

[Northern]

Any possibility of doing ix front diffs for lsd/durabilityy for higher power setups?

[SkiFree]

Has anyone bought a differential from these guys? I see them on ebay all the time advertising stuff they say they are out of stock off but are their rebuilt diffs any good?

That would be Rob of Precision Gearing ( http://precisiongearing.com/index.html ) who was taught by Rob Inhout, who in the long-time BMW crowd (the late Leif Anderberg, Carl Nelson, Jeff Ireland, Ray Kormann, Jim Rowe) is one of the grandfathers for racing BMW's in the US. Rob can sometimes take a while but does good work.

Here's one of his 168mm race diff's before going on the #13 car.


Been running Rob's diff's (and transmissions) on the race cars for several years with great success.