Just putting it out there - is this something worth checking out??

[El_Freddo]

If you're looking for the best performance rear differential for your Subaru STi then look no further. The OS Giken unit takes the concept of a clutch type differential and steps it up a notch to provide a unit that is both streetable and truly track worthy.

Years of extensive research and development lead to a new and revolutionary LSD design with the capacity to house an unprecedented number of friction plates (up to 28 plates in total) and thus the OS Super Lock LSD was born. The increased number of plates directly has not only dramatically improved our LSD design's locking force and enables it to lock fully and completely. An added benefit to being a fully locking mechanism is that less heat is generated, thus resulting in incredible durability and reliability. As expected from OS Giken, our LSDs are not only made from the highest quality materials, our precise machining, forged gears, and sound engineering makes our LSDs the most durable and reliable race performance LSDs available.

If you're looking for a mod that literally will transform the performance of your car, then this is it.

This unit is a bolt in replacement for all Manual Transmission Cars. Fits 2002-2007 STi (GDB chassis). Usually ships in 1-7 days. Shipping costs shown are in the lower 48 states. We will contact you with any unusual shipping delays. Contact us for shipping pricing outside the continental USA. We can offer the full range of OS Giken products, for all sorts of cars ranging from Vipers to Porsches, Subaru's to Lotus and everything in between.

Two questions about this LSD (cost from US is $1525.00) from the bold sections:

1) Will this actually lock the rear end? I realise it won't be like an auto locker but it sounds like it's the goods as it would be gentle to lock.

2) will this fit the R160 diff, or is it an R180 unit? Being advertised for an STi I'd think it's an R180 but there's no mention of this in the ad.

I find this an interesting unit that probably has more questions than even the supplier can answer. If I had money I didn't know what to do with I'd probably give this a go - I'm keen to find out if it will lock/keep the vehicle moving when two wheels are lifted.

I'm also keen to know how long it remains locked and how long it takes the unit to wear out...

Anyone know of anyone using this unit? It's *just* outside my reach with my poo change to give it a go. I'm also still keen to see Taza's project get into production and would rather wait for one of those units.

Cheers

Bennie

[d_generate]

Pretty sure it would be a 180. I just noticed a 5 speed center locking diff on here for $883 + but no information on how it works though plenty of people here in Perth buy from these guys and they are pretty good at answering questions.

Edit.... Even cheaper one on page 2.

http://www.japanparts.com/db/partslist. ... r=&VOLKEY=

[stenno]

Search for a r160 diff out of a sti "ra" model. Clutch / plated rear diff stock and an option available on all Japanese sti's from gc8 onwards. About $500 landed through import monster.com.au. get the right model that matches your driveshafts or comes with the diff stubs as sometimes they are longer than normal stubs and near impossible to find in aus. Subaru ones can also have the preload etc changed through more/less clutch plates added and the ramp gears to change the rate of lock too. Not a cheap exercise tho.
All the centre diff locks available are only to "fix" the front:rear split usually from 35:65 up to 0:100. You can get albins or ppg ones locally too or weld your own if you want a rwd "spool". Heaps of DIY guides on wrx sites like nasioc and rs25 etc and nearly all mention that you eventually need to upgrade diffs and driveshafts etc as they fail eventually. Sort of like running an "ea" gearbox in rwd with no front shafts.
I'd love a front and rear ATS or os ginken diffs but I think shoehorning in a Nissan r200 and getting shafts made would cost less and fix more issues in one hit.
Someone on rslibertyclub started a thread recently where he upgraded Subaru r180 shafts and cv cups to skyline ones as they were the next weakest link.
Al from am auto installed a r230 diff into a gen 3 liberty and "general disorder" on usmb was getting bearing carriers made to use "ea" axles with a r180 for around $100 us a pair.
Plenty of different options available

[thunder039]

talking about locking rear diffs, is it possible to weld and lock a rear diff in a subaru awd?? or will it stuff the center diff?

[d_generate]

You can weld the rear, plenty of people do it and many remove a rear axle for daily driving then pop it back in for off road, Guy did it but also blew his box the same day.

Be interesting if you could make a sliding tube and spline which could be moved up and down the axle for on/off road ease of use.

[thunder039]

would be a cheap alternitive to the LSD although it does make it somewhat uncomfortable on the road, with my perivious experience in cars with locked rear's not to mention the excessive tire wear. however if it wasnt your daily car might be a good option for some one

[B00sting]

What I plan to do after the ej25 conversion is upgrade to r180, or r200 diffs and buy ARB lockers. Unsure at this stage if front/rear lockers are available, but based on the threads i've seen, something is available!

no point stuffing around with LSDs for offroading.