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R180 Diff Options


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#21 d3c0y

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Posted 02 July 2016 - 09:46 PM

Just pull the hat off and the ratio is stamped on the crown wheel. Also you can see what sort of LSD is in the diff by looking at the carrier. All STi rear diffs are LSD but there are three different types. I would be guessing it's a 3.9 with a suretrak centre (torque sensing).


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#22 Cozza

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Posted 02 July 2016 - 10:25 PM

How can you tell what type of centre it has, how do they look different?

#23 locklock

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Posted 02 July 2016 - 10:30 PM

Thanks decoy, so which type of lsd is best and how to differenciate?
Suretec or torsen?

I think this diff is 4.11, as the seller told me was taken from ej20 engine car. And this is what i found on a subaru forum.

image.png

Edited by locklock, 02 July 2016 - 11:42 PM.


#24 Mike260LW

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Posted 03 July 2016 - 07:28 AM

Subaru sti diff 3.9 lsd fits right into a 240z body? Or need modification?


The Stewart Wilkins Motorsport modded stubby shafts for the Subaru diff don't have the Datsun R180 half shaft centre bolt fitting so you have to source R200 half shafts or another pair of R180 half shafts and change the inboard Uni flange for the outboard ones i.e. Outboard flanges both ends. I would steer clear of the viscous Subaru diffs and plump for a Torsen or clutch pack type; the latter being harder to find.
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#25 dat2kman

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Posted 03 July 2016 - 09:54 AM

I have sets f R180 and R200 output shaft/flanges, to now sell.

#26 Riceburner

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Posted 03 July 2016 - 03:15 PM

I have sets f R180 and R200 output shaft/flanges, to now sell.


PM sent

#27 locklock

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Posted 03 July 2016 - 04:29 PM

Gareth u beat me to it :(

Anyway i found a site explaining the difference of vicious, helical and torsen.

http://www.trak-life...ferentials-lsd/

#28 Riceburner

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Posted 03 July 2016 - 05:01 PM

Gareth u beat me to it :(

Anyway i found a site explaining the difference of vicious, helical and torsen.

http://www.trak-life...ferentials-lsd/

Sorry locklock, I thought you were going for the Subaru diff? You'll need the billet output shafts for those diffs. I read dat2kman's post as being for standard output shafts.

 

I haven't bought them yet, I only asked for a price. If you need them they're all yours :)



#29 locklock

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Posted 03 July 2016 - 05:09 PM

Its okay.. I still havent decide to get the subaru diff yet... Im asking my mechanic and see if he is able to get one done.. Im too far away from you guys..

#30 d3c0y

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Posted 03 July 2016 - 09:03 PM

If it's a 4.11 and 2.0L car it will be an R160 and not from an STi. To my knowledge Subaru didn't use 4.11 R180s. The type of LSD center you want depends on what you are using the car for. All three will work and be better than an open diff especially on the street, but I would probably rate Mechanical, Torsen, SureTrak with mechanical being the best if you are going to the race track. Torsens only come in 3.5 ratio and are found in the GDG hatchback shape, but i think that is a bad ratio for any zed. 3.9 ratio Suretracks are the easiest to find and came in all GDB - GDC models excluding the STi Spec-C models which came with 3.9 ratio mechanical diffs.

 

 If you want an R180 LSD this is the easiest way to do it.



#31 Cozza

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Posted 03 July 2016 - 09:07 PM

I got a 3.9:1 Torsen.

#32 d3c0y

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Posted 04 July 2016 - 10:18 AM

I thought you had a SureTrak?

 

For the record Suretraks have smooth carriers and mechanical are cast from memory.



#33 dat2kman

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Posted 04 July 2016 - 12:40 PM

Gareth, PM replied.

#34 zcar63

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Posted 04 July 2016 - 07:49 PM

just picked up R180 LSD with 4.1:1 ratio :)



#35 Cozza

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Posted 04 July 2016 - 07:57 PM

just picked up R180 LSD with 4.1:1 ratio :)


Good score, was that the one on Ozdat or you got a Subie one?
The one recently for sale on Ozdat looked like a good deal.

#36 Cozza

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Posted 04 July 2016 - 08:16 PM

I thought you had a SureTrak?

For the record Suretraks have smooth carriers and mechanical are cast from memory.


Nah both Torsens, I've just been searching my phone for pics of my centres but don't seem to have any. From memory they are cast but can't be sure.
I'll try to remember to get a couple pics next time I do a swap over.

#37 zcar63

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Posted 04 July 2016 - 09:57 PM

Good score, was that the one on Ozdat or you got a Subie one?
The one recently for sale on Ozdat looked like a good deal.

the Ozdat one



#38 d3c0y

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Posted 05 July 2016 - 09:11 AM

That's not an Subaru diff though.



#39 Groundhog

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Posted 06 November 2016 - 08:07 PM

Found this excellent resource on Diffs explained.

http://forums.hybrid...230-diff-mount/






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