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Old 08-16-2001, 09:54 PM   #1
Joe Hogan
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Default Difference betwen R160, R180, R200 rear diffs

Reading up on rear diffs it appears that the RS uses a Nissan part R160. The beefer R180 appears to be a direct bolt in. But for those with BIG power it my require a R200 out of the 280Z model cars to keep them from breaking.

Any thoughts or experiences?

http://www.gordon-glasgow.org/lsdtech.html#appdxB

JH
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Old 08-17-2001, 12:32 PM   #2
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The R180 is a damn stout piece. The R200 is even more so. I would recommend checking the Nismo catalog, btw, as they make the exact same finned transmission cover (large capacity, tapped for a cooler) as STI. It just happens to be radically cheaper.

edit: Given that we are awd, the R200 is probably overkill for anything. It's good to at least 550 ft/lbs.
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Old 08-17-2001, 02:42 PM   #3
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your data meshes with what I know, Joe. (*but* what I know is only from helping a friend who has owned a few Zs.)

The Hitachi R160 and R180 share a case, but they usually have different axle splines.

I believe the R200 is a bigger case. Find a 240SX and take a few quick measurements to be sure-- should be bigger than an Impreza's rear diff and look a bit different too.

Busting rear diffs now with all that power?
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Old 08-17-2001, 03:32 PM   #4
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I remember reading something from the STi-MList about needing new axles to use with the R180 diff. I don't have the email any longer though, so I can't refresh my memory.

-Jon
www.nothingserious.net
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Old 08-17-2001, 05:13 PM   #5
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Does anyone know what the approximate power limit for the r160 differential would be..?
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Old 08-17-2001, 07:53 PM   #6
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I've been told around 300 lb ft. It's most likely _not_ an issue.

Let's find ourselves a carbon fiber driveshaft and save some more components =).
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Old 08-17-2001, 10:05 PM   #7
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Well..... it might actually be an issue

Anyone know where to find an r180?
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Old 08-18-2001, 12:17 PM   #8
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ColinL,

Do you know if the case for the R160 and R180 are exactly the same internally? Or has the R180 been machined for a larger gear set?

As I am able to get the power to the ground there have been some weaknesses discovered. I am just trying to get a ahead of the curve ... so to speak

JH
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Old 08-18-2001, 12:27 PM   #9
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A couple months ago I spoke to MRT.. I believe that they said a full r180 conversion would cost around $2500 USD. There must be a cheaper way... I know I'm going to need the r180
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Old 08-18-2001, 03:50 PM   #10
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Caco...

Looks like any 240z or automatic transmissioned 280z came equipped with a R180. Some of the standard 280z's were equipped with the R200.
The trick, it appears, will be matching the gear ratio to front diff. From a quick glance through some Nissan/Datsun Web pages, you will have to replace the ring and possibly the pinon to get a compatable gear ratio. Even if you miss this by a small amount you will end up with unnecessary strain and heat in the drivetrain.

The R180 should be available at a bargin price from a Nissan salvage yard.

BTW my car budget now has me digging through the trash {junk yards} as well

JH
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Old 08-18-2001, 05:33 PM   #11
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The R180 was also standard on the 200SX Turbo and V6, as well as the 240SX. They are damn common. I am sure MRT is selling you a new one, hence the cost. All of the late model Z's have the R200, as well as some older Z's. Nismo also makes about twenty different ratios for it, as high as 6+:1.
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Old 08-19-2001, 02:20 AM   #12
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I have a R160 under My turbo SVX (rear wheel drive) and it holds up pretty good. My car came with a R200 diff but I could not stand the 3.545 gear ratio
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Old 08-19-2001, 05:24 PM   #13
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KevinL,

How hard was the swap from the R200 to the R160?

JH
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Old 08-20-2001, 01:03 PM   #14
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Joe,

Swapping out a rear diff isn't too hard. You just drain the oil, disconnect the driveshaft, and pop the axles out. I'd say the last step is the most annoying and requires the most effort. Then you can just unbolt the differential from the rear cross member.

And try not to have anything fall on top of you or your helper, by the way. j/k

-Edwin
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Old 08-21-2001, 11:16 AM   #15
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I believe 280zx turbo 5-speeds from 80-83 came with an R200 with a 3.90:1 ratio
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Old 08-23-2001, 01:08 AM   #16
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The R180 is physically bigger than the R160. To use the the R180 you will need the corresponding axles and hub carriers, as the driveshafts and CV joints are bigger.

I can get that stuff if anyone wants it but it ends up being spendy for all the parts you need. The R180 diffs I get are going to come with a 4.44 ratio and an STi plate type LSD. Other ratios may be available, I dunno. We've got this setup in Pat Richard's Open class rally car. The rear wheel bearings are much bigger than the R160 hubs.
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Old 08-24-2001, 08:03 PM   #17
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Dave,

Are the R180 hub carriers, axles etc. Subaru Parts [Sti?]? Does the larger cased R180 bolt directly into to the existing mounting holes? Is the drive shaft [from the transmission] the same or does it use a different mounting flange?
It is my understanding that Subaru uses different driveshafts and flanges even within the same year RS?


Thanks,
Joe
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Old 08-24-2001, 11:24 PM   #18
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The R180 hub carriers are a regular Subaru part, probably from an SVX or something. They also come on WRX STis, of course.

The R180 bolts directly into the same crossmember as the R160.

The standard RS propshaft will bolt straight up to the R180.
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Old 08-25-2001, 12:04 AM   #19
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Dave,

Thanks,

Joe
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Old 11-28-2004, 09:09 AM   #20
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Quote:
Originally Posted by Conduit
I've been told around 300 lb ft. It's most likely _not_ an issue.

Let's find ourselves a carbon fiber driveshaft and save some more components =).
Any other opinions on how much the R160 can reliabily handle?
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Old 11-28-2004, 03:02 PM   #21
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Beats me! I've been RWD for about a year at stage 4++ with OEM drive components and havn't yet encountered any problems.
I was just going to wait until it broke, but I think I'll go ahead and do some changes over the winter, seeing as I'm probably doing NOS and a t3/t4, come race time in the spring.
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Old 08-03-2005, 03:31 PM   #22
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Quote:
Originally Posted by jaypine
Any other opinions on how much the R160 can reliabily handle?
I have run over 300+ft-lbs of tq thru one autoxing it...over 150 hard launches on a 1985 spec SUBARU LSD R160...no problems so far.
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Old 07-09-2011, 04:14 AM   #23
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i have to bump this. this is good info. i was in the process of doing an sti 6sp swap, and wondered what was the limitations of an r160, and honestly, from what this says 300 lb/ft to just the rear is 600lbft total. for a guy thats only gonna be puttin out about....400lb/ft total is a beautiful thing.
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Old 07-09-2011, 03:52 PM   #24
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Just thought I'd shoot this out to anyone that is going to swap for a R180.. These axle are darn near impossible to find. I had to search day and night for ones that weren't over $400 a pop.. You've been warned my fellow friends.
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Old 07-09-2011, 04:42 PM   #25
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i know nothing of the diffs. R160 is stock STI? R180 is different how?
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