Difference between R160 R180 LSD diff?
 

does any one know the part number which tells you the difference between the R160 and the R180.. i know the R180 is bigger than R160,that does not help if you don't have the two diffs in font of you..

[QUOTE=superman]does any one know the part number which tells you the difference between the R160 and the R180.. i know the R180 is bigger than R160,that does not help if you don't have the two diffs in font of you..[/QUOTE]

which yr did the diff come off?

i thought only the GDB (MY01 onward STIs) came with R180

earlier GC8 versions came with it also, mainly the STI-RA

The STI RA gC8 is also where you can get the 2 spot rear brake setup found on later my01 wrx's, that fits the R180. So you can keep your existing front brakes and replace the rears with that setup to avoid $3k brembo costs.

its out of a my00, but someone has put a different diff, was told it was out of a my02 sti.. but i need part number to see if its a R180.. planning to sell it.

r180
 

The R180 diff has a "K" on top of the casing.

Bump...

I gather the K on the casing is an accurate way to distinguish?

Are all LSD 2 way and plated? Or are there differences in models...
Also how can I know if a diff is 2 way and/or plated

[QUOTE=Jezza;548957]Bump...

I gather the K on the casing is an accurate way to distinguish?

Are all LSD 2 way and plated? Or are there differences in models...
Also how can I know if a diff is 2 way and/or plated[/QUOTE]

The bugeye STi uses a suretrac LSD front and rear. which is a one way mechanical.

[QUOTE=johnvk7;549008]The bugeye STi uses a suretrac LSD front and rear. which is a one way mechanical.[/QUOTE]

Suretrac is not a one way anything. Suretrac refers to the LSD type.

Terms like 1/1.5/2 way are used to describe plated LSDs only.

[QUOTE=Jezza;548957]Bump...

I gather the K on the casing is an accurate way to distinguish?

Are all LSD 2 way and plated? Or are there differences in models...
Also how can I know if a diff is 2 way and/or plated[/QUOTE]

K on the housing doesn't tell you anything.

There are white paint markings on the top of the diff that can tell you its contents if you have access to its interpretations.

ALL Subaru plated rear Diffs are 2 way.

And then there are R180 Suretracs (ADM GDB my01-my04)
and R180 Torsen Helical (ADM GDB my07 and ADM GRA/GRB my08 - my11)
Plate LSDs were only used in ADM GDB models; my05 and my06 STI.

Thanks Mister Two,

I'm guessing plated LSDs are 'hellical'/mechanical?

And my MY00 WRX would have a 3.9 R160 viscous rear?

I am keen on fitting a LSD rear... there is one going cheap at the moment, but I want to be sure it's what I'm after.
Apparently it's off a 97 STi RA, and was fitted to an 04 WRX.
I know the V3 RA had R180 gear, so it cant be off that (unless he changed shafts and hubs), but the V2 had a R160 plated with DCCD...

I will have to check the bolt spacing to establish if it's R160 or R180... but is there any way I can check for viscous vs plated without opening it up?

The K bit does give you the ability to distinguish R180 from a MY01 onwards STi

And to spot the difference between R160 and R180 is put them side by side, one's bigger than the other

Plated LSD is NOT the same as a Torsen Helical.
Plate LSD uses clutch plates to lock up the LSD to give a stable 50/50 torque split between the left and right axle.
A Torsen Helical uses planetary gears to transfer more torque to the wheel with the most grip. (ie. the outside wheel in a corner)

Your my00 WRX comes standard with a 3.54 Viscous LSD rear Diff

If that diff came out of a 97 RA (WRX RA - not STI RA) and was fitted to a 04 WRX, then it is a 4.44 ratio.
The V2 STI came with a 4.11 Viscous LSD. ONLY the V2 STI-RA came with a 3.9 Plate LSD

[QUOTE=Mister Two;549016]Suretrac is not a one way anything. Suretrac refers to the LSD type.

Terms like 1/1.5/2 way are used to describe plated LSDs only.[/QUOTE]

Suretrac is a torque sensing LSD, it only begins to lock when torque is applied, not when coasting, that makes it a one-way differential. And I can produce SUbaru technician literature that supports it.

Diff FS thread is here [url]http://www.perth-wrx.com/vb/showthread.php?t=40992[/url]

From his description it is a 3.9 from a STi RA, fitted by ASG to his 04 WRX.

Would this be bolt on for MY99/00?

It would be so much easier if I could find a chart of all this information, there is just so much variety and different combinations! :/

3.9 wont work in a MY99-00. These need 3.545 rear ratio. Or you could change the transfer gears from 1.1 to 1, to 1-1

[QUOTE=johnvk7;549032]Suretrac is a torque sensing LSD, it only begins to lock when torque is applied, not when coasting, that makes it a one-way differential. And I can produce SUbaru technician literature that supports it.[/QUOTE]

Suretrac LSDs dont lock with more torque input. They bias to the wheel with the most grip.

[QUOTE=Mister Two;549037]Suretrac LSDs dont lock with more torque input. They bias to the wheel with the most grip.[/QUOTE]

They only operate when torque is applied, thats what i said, to say they lock maybe is wrong, but essentially they are one way.

I've gone back over my technician reference books, Suretrac does lock, and it is mechanical, when there is a speed difference between the 2 wheels, it tries to equalize the speed, just like any other LSD.