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Old 07-14-2014, 08:32 AM   #26
Vlad
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I had researched the High temp warning light and installed a sensor in my R160, which I wired into the dash.
To test the sensor and get it to actually trip, I had to literally heat it with a flame.

I have been researching and could not find even one single instance where at some kind of track, maybe drifting or going to the Texas Mile, ANYBODY EVER reported legitimately tripping this light.
There were instances of corroded ground, which caused bogus readings.
So in '05 Subaru redesigned this ground, to eliminate this and indeed the instances reduce a lot.

So I am looking at Subaru's redesign of the Diff cover in '08. It does not provide extra volume for oil cooling, which they could have done, if they wanted. So they were not worried about this with their redesign.
They wanted to insert the sensor deeper into the diff box though, to make it more responsive, to get it to trip earlier.
So my question becomes:
Did anybody ever hear or experience a legit oil light in cars with Sti R180 from AFTER '08?
Is the light now functional, it actually does something?
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Old 07-23-2014, 11:40 AM   #27
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I think I figured the '07 R180 helical, it's marked HR. I will update above. And bump for my question about anybody seeing the diff light in an '08+
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Old 10-30-2014, 03:31 PM   #28
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Is there any information about this diff?
Looks like H5
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Old 07-07-2015, 11:52 AM   #29
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I know that this is an old thread, so sorry in advance. I was wondering if anyone knew if the jdm r180's ever came with a star stamped in the bottom left corner like the r160's do? I read somewhere that the covers shouldn't be interchangeable, that the r160 has a 60mm bolt spread and the r180 has a 75mm bolt spread in their patterns.
The reason I ask is that I bought my 02 WRX in 2007, it had previously had a jdm 6speed non dccd trans swap. He also told me the rear diff was included. I am not able to get into contact with the previous owner anymore and even if I was, I am not sure how much he would remember/help specifics wise. Anyway, its leaking and I was just going to go ahead and replace it with a new gasket, new cover, and a new breather vent.
I assumed I had an r180 so I pre purchased an r180 cover, I took a peek at the one on the car last night and its cover has a star.....
Any and all info would be greatly appreciated.
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Old 09-22-2017, 01:24 AM   #30
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Quote:
Originally Posted by sergey2007 View Post
Is there any information about this diff?
Looks like H5
H5 should be a 2015
I have seen some manual say its a Torsen. Not sure 100%

Last edited by sub9lulu; 09-22-2017 at 01:31 AM.
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Old 09-22-2017, 01:26 AM   #31
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Considering the image was posted in 2014, I have a feeling you're wrong.
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Old 09-22-2017, 01:34 AM   #32
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I have a 2015 sitting in my garage that says H5 on it. Possible that 14 and 15 share the same diff
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Old 09-22-2017, 11:53 AM   #33
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My point was that none of the original posters are likely reading this thread.
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Old 10-01-2017, 12:15 PM   #34
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Default '02 Wrx front diff ....... factory posi offered ?

Help ! ........... I know this is an old thread, but ....... one of you are on-the-know to inform me if my '02 WRX had posi up front from the factory, or was it offered in rear-only ?

and, ...... ratio offered was 3.90 ? ....... I don't know

.......... I haven't checked mine and suppose I should, but I have been driving this WRX for 10-years now, and no-alterations .. all-stock.

What is the weak-link in the Front-Diff (ahead of transmission) ?

My thoughts were that clutch-type posi's can wrap-up and release with a Thunk or Bang. and this action must have detrimental effects on posi components ?
Where there is an action, there is a "reaction" of Thunk !

Another thought ......... if running two-different tire diameters on the front diff., .... is the "average-diameter" ratio in disagreement with that being transferred to the vicious coupler from the rear ?
My initial thought is that No, the ratio transferred from the front if 3.90, is still 3.90 to the Coupler. and the rear too is 3.90 to the Coupler.

My conclusion - the wrap-up occurs in the Diff.

With an open Diff, the smaller diameter tire is trying to keep-up with the speed of the larger diameter tire. So, then is the revolution speed the same coming out of the Diff., as if the two tires are the same diameter ?

May there be a 'difference' which may cause Coupler wrap-up too ?

If there is Coupler wrap-up (the Center-Diff), ... then does it make a Thunk or Bang, or just quietly slip ?

Any thoughts folks ? ....... thank you,

Leonard
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Old 10-02-2017, 09:31 AM   #35
Charlie-III
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Quote:
Originally Posted by Greaser007 View Post
Help ! ........... I know this is an old thread, but ....... one of you are on-the-know to inform me if my '02 WRX had posi up front from the factory, or was it offered in rear-only ?

and, ...... ratio offered was 3.90 ? ....... I don't know

.......... I haven't checked mine and suppose I should, but I have been driving this WRX for 10-years now, and no-alterations .. all-stock.

What is the weak-link in the Front-Diff (ahead of transmission) ?

My thoughts were that clutch-type posi's can wrap-up and release with a Thunk or Bang. and this action must have detrimental effects on posi components ?
Where there is an action, there is a "reaction" of Thunk !

Another thought ......... if running two-different tire diameters on the front diff., .... is the "average-diameter" ratio in disagreement with that being transferred to the vicious coupler from the rear ?
My initial thought is that No, the ratio transferred from the front if 3.90, is still 3.90 to the Coupler. and the rear too is 3.90 to the Coupler.

My conclusion - the wrap-up occurs in the Diff.

With an open Diff, the smaller diameter tire is trying to keep-up with the speed of the larger diameter tire. So, then is the revolution speed the same coming out of the Diff., as if the two tires are the same diameter ?

May there be a 'difference' which may cause Coupler wrap-up too ?

If there is Coupler wrap-up (the Center-Diff), ... then does it make a Thunk or Bang, or just quietly slip ?

Any thoughts folks ? ....... thank you,

Leonard
How big a difference in tire size/diameter?
How long has it been driven this way?

All 4 tires should be the same size all the time, there is no real good place to run a different size tire on any AWD car.

Found post 118 here.....https://forums.nasioc.com/forums/sho...1170285&page=5 where you answer some of the questions.

Last edited by Charlie-III; 10-02-2017 at 09:45 AM.
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Old 07-17-2018, 05:46 PM   #36
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Quote:
Originally Posted by Vlad View Post
So I see that the part number of the late '07 differential, which is Torsen and 3.54, is different than the part number of the '08+ diff.

So far the possible list is:
'02-'03 JDM early style clutch 3.9:1 HW
'02-'05 JDM Suretrack 3.9:1 HF
'04 -'05 USDM and JDM 3.9:1 clutch HK
'06 -'07 USDM & JDM clutch style 3.54:1 (and '07 RAR and S204 and '07 Spec C) HX
'07 late model Torsen 3.54 HR
'08+ USDM 3.54:1 Torsen with new design rear cover with inset temp sensor H3
This is the most helpful info I've found on identifying the R180's in the field, but I'm still trying to lock down if there are any axle spline differences between the different year and market diffs. Does anyone know, or have a resource to show if there was ever a spline change between the R180's?
I've got what is supposed to be an 03 JDM Suretrack r180 (HF marked on the web by hand), and the 05 axles I have don't mate up; too big to fit into the splines. My old WRX (2004) axles are too small to fit into engage the splines of the diff.
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Old 07-17-2018, 07:25 PM   #37
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The spline differences were between Nissan and Subaru R180's, primarily.
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Old 07-23-2018, 05:27 PM   #38
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Quote:
Originally Posted by mrsaturn7085 View Post
The spline differences were between Nissan and Subaru R180's, primarily.


Found this on a 510 forum;
“R180 out of the 04-07 WRX sti uses 27 spine stub ends”
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Old 07-23-2018, 11:09 PM   #39
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Quote:
Originally Posted by matz73z View Post
Found this on a 510 forum;
“R180 out of the 04-07 WRX sti uses 27 spine stub ends”
Maybe I'm not understanding your point/question.

The Subaru R180 uses the same splines between the left and right sides.

Many Nissan R180 differentials use dissimilar splines so the driveshafts are specific to the left and right side.
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