Subaru (R160 diff) Rear Locker project

Hi El Freddo, you say you have a center locker in your L series, is it a full time 4WD with center locker or is it a FWD and then you engage 4WD which means no center diff ?
 
^ It's Part Time 4WD. He current has FWD then puts it into 4WD and has the option of Hi or Low range. So No Centre diff.

While you can get a Vortex box (rare) that is AWD (has centre diff) but can be locked by the flick of a switch (vacuum pressure). I currently only know 2 people with this setup and EL_Freddo will soon make a 3rd person when he completes his new box.
 
Thank you Taza (I drove through Taza, little town in south Morocco !)

By the way, in what subaru was the Vortex built, maybe I can find one over here.
 
Vortex a.k.a. 'rocking horse poo' - i.e about as rare as.

I'm still looking foward to seeing the details of the dna results for the Yowi - on which day the locking rear diff which is the origin of this thread will be released... by which time I hope it will be compatible with my zimmer frame! :rotfl:

We all live in hope. :iconwink:
 
Biesel said:
The sti front diff is a torsen same as obx.
Click to expand...
I had a brand new STI front 1.5-2 way diff and they are clutch pack, I sold it for $1,500 as I was told they were not as good as a torsen for slogging around like we do and make lots of bangs so I bought an OBX delivered from the States in 4 days and was over the moon with it........along with the 4.44 crown wheel :lildevil: and 1.19 reduction.

You'll find most of the diffs available for Subi's here.
Japanparts.com - Mail order from Japan directly|JDM Parts,Performance Auto Parts,for Subaru, Mazda,Mitsubishi,Honda,Nissan,Toyota car
 
Well, a complete 2nd hand rear diff costs about 800 AU$ here with about 50'000 km.

But if you wait a few months, I'll have a rear locker and will tell you how much it costs (about 1'200 €)
 
d_generate said:
I had a brand new STI front 1.5-2 way diff and they are clutch pack, I sold it for $1,500 as I was told they were not as good as a torsen for slogging around like we do and make lots of bangs so I bought an OBX delivered from the States in 4 days and was over the moon with it........along with the 4.44 crown wheel :lildevil: and 1.19 reduction.

You'll find most of the diffs available for Subi's here.
Japanparts.com - Mail order from Japan directly|JDM Parts,Performance Auto Parts,for Subaru, Mazda,Mitsubishi,Honda,Nissan,Toyota car
Click to expand...

Why does everything i read say that 6spd sti come with torsen then?? evn the people selling them say they are?

https://www.ebay.com.au/itm/JDM-Sub...r_Truck_Parts_Accessories&hash=item2a22ccd73a
 
I have some fresh news, my rear locker should be done for april...
 
The STI front diff from a 6 speed (ADM MY05 onwards) is a helical type LSD. They are not a plate type. The functional difference between a helical and a plate type is that a helical needs some load on the opposing wheel to work. So if one wheel is off the ground, the diff acts like an open diff. In race applications, the helical has other limitations as well. But they work a treat on the skidpan, and my expectation is that they should work well in muddy, sandy, gravel situations where both front wheels remain on the ground. Plated diffs are available for them. I'm going for the helical front diff as I have one laying around out of a mate's 06STI. The reason being he races it on the circuit and now runs a plated front diff.

Biesel said:
Why does everything i read say that 6spd sti come with torsen then?? evn the people selling them say they are?

https://www.ebay.com.au/itm/JDM-Sub...r_Truck_Parts_Accessories&hash=item2a22ccd73a
Click to expand...
 
Yeah I'm pretty sure the helical diffs subaru use are just a revised design of the old yank torsen(torque sensing) diffs. they have a pre loaded bias usually 5:1 meaning if the wheel with low traction is generating 20nm of torque say. the worm gears inside the diff will bias 5 times that (100nm) to the wheel with traction. These diffs are great for reliability no more maintanence then a standard diff. problem is wheel popping.

Put a wheel in the air it starts to free spin it's generating no torque thus 5 x 0 = 0nm of torque to the tyre with traction. the US army fit torsen diffs to those hummer things they drive apparently and train the drivers to pulse the brakes and throttle if they get hung up etc. I think this type of diffs fitted to the SH foz with it's brake pulsing VDC could make it a real weapon.

The problem with clutch/fluid type diffs is they work off wheel speed if both wheels turn at the same sped they are happy this gives basically a 50/50 torque split. this means though if a wheel loses traction 50% of that power is lost out that wheel. Same for locking diffs. where the torsen is nice is it will actually give you more than 50% to the wheel with traction. Like i said i think most are 5:1 some are 7:1 NFI what subaru would use. clutch/fluid/lockers work though when a wheel is in the air because they work off speed not torque they are activate by one wheel turning very fast an the other turning slower or not at all.

Hybrids, companies like wavetec make a torsen type diff with a clutch LSD inside it. This means that the diff operates as a torsen diff but if a tyre starts turning significantly faster than the other. the clutch part of the diff than starts to apply some resistive slowing force to the wheel that is spinning thus it starts to generate torque then the bias ratio of that torque goes to the wheel with traction.

I think this is right for the helical type diffs subaru use? Some newer torsen diffs i think also have a variable range of bias not just a set amount or this is atleast the impression quaifie give for their design.
 
If you cannot wait for a locker diff, why not use a plated one? Recent expereince has shown that in conjunction with an STI front diff, they work very well
 
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