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Old 12-25-2018, 11:39 PM   #1
killadawg
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Join Date: Jun 2015
Chapter/Region: NWIC
Location: Bellingham WA
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2016 WRX stg 4 Rally
STI Drivetrain GM

Default r180 rear diff. whining and smoking

So I took my rig out for some fun.. well that didn't last long.. diff has been great and no noises ever.. only change is winter tires. Diff has 10k only from an STI swap 2015 3.90 gear ratio. I will check fluid before I go and pull the cover. I went up a hill and heard hella whining and when I stopped I thought my car was on fire. Hope its salvageable!
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Old 12-26-2018, 08:35 AM   #2
Charlie-III
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Join Date: Dec 2002
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Location: USA, North NJ, 07456
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1998 Legacy 2.5GT
Silver Sleeper BK, 5MT

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Hopefully all 4 winter tires are same size and inflation?
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Old 12-26-2018, 09:00 AM   #3
killadawg
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2016 WRX stg 4 Rally
STI Drivetrain GM

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Quote:
Originally Posted by Charlie-III View Post
Hopefully all 4 winter tires are same size and inflation?
tires are the same (I checked this last night as it was my thought as well) I have not checked pressure. I will do so later today.
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Old 12-26-2018, 11:45 AM   #4
08OBS
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2018 Colorado Duramax

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What's the drivetrain setup on the car?
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Old 12-26-2018, 01:04 PM   #5
Charlie-III
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Silver Sleeper BK, 5MT

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Quote:
Originally Posted by killadawg View Post
So I took my rig out for some fun.. well that didn't last long.. diff has been great and no noises ever.. only change is winter tires. Diff has 10k only from an STI swap 2015 3.90 gear ratio. I will check fluid before I go and pull the cover. I went up a hill and heard hella whining and when I stopped I thought my car was on fire. Hope its salvageable!
Quote:
Originally Posted by 08OBS View Post
What's the drivetrain setup on the car?
While this may usually a good question, sounds like (in this case) was fine UNTIL a winter tire swap. Thus my question on tire sizes, wear and pressures.
Now, if a new drivetrain swap, then yes, other drivetrain questions arise.
Since it sounds like tires only, then focus on the only new variable. Thus wear and pressure (hoping OP knows enough to keep same OD tires on an AWD....).
I will guess OP has a sorta clue on a Subaru AWD and tire OD.
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Old 12-26-2018, 01:47 PM   #6
killadawg
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Join Date: Jun 2015
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Location: Bellingham WA
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2016 WRX stg 4 Rally
STI Drivetrain GM

Default

Quote:
Originally Posted by Charlie-III View Post
While this may usually a good question, sounds like (in this case) was fine UNTIL a winter tire swap. Thus my question on tire sizes, wear and pressures.
Now, if a new drivetrain swap, then yes, other drivetrain questions arise.
Since it sounds like tires only, then focus on the only new variable. Thus wear and pressure (hoping OP knows enough to keep same OD tires on an AWD....).
I will guess OP has a sorta clue on a Subaru AWD and tire OD.
This is a WRX 2016 with an STI full Drivetrain and subframe swaps (only thing WRX is steering rack which I opted out of due to the hook up task)

drove fine for around 10k miles (very hard miles I just admit, lots of hill climbs and Track time) harness to MapDCCD broke at 4k miles ago and I never re-soldered the replacement, so running without center diff. control (supposedly it defaults to 40-60.. please correct me if I'm wrong).. I did a very steep hill climp on Sunday 3 days after tire switch, i figured the rubbery smell was tire compound (bliz w80's, was on RE71R). Yesterday I drove for maybe 10 miles up a steep hill and when I stopped I thought my car was on fire, smoke billowing from the back end and a bad burnt clutch like smell.. (I've burnt a cluth in this car before and the smoke was in the front.. this was not my clutch.. also running a Stage 3 endurance and I was hardly pushing it) I was in 2nd or 3rd going up a steep incline, by no means WOT.. 3k -3.5k rpm max 25mph maybe...

STI swap had 1.4k miles on it.. like new. drove from Boston to Seattle with 1klbs of luggage, roof rack, family, etc.. no issues at all (same setup, with Re71r tires in July).

I just drained the fluid, it looked like blue metallic paint (lots of silver in this) and the plug was at full shavings capacity. Also if I remember correctly when I spun the wheels when I did the swap both wheels moved in the same direction. I put the car in neutral and spun the driveshaft.. front wheels both moved forward and the rear one was forward one was backwards (acting like an open diff.) is that normal? could that be due to my unplugged DCCD? or did a fubar the diff? or other component of the rear end?

thanks for the help guys

here is the car for more info on the build:

https://wheelwell.com/killadawg-09-1...016-subaru-wrx
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Old 12-26-2018, 10:06 PM   #7
killadawg
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2016 WRX stg 4 Rally
STI Drivetrain GM

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Seems I just drove super hard.. the fact that my hill climbs where in 6 inches of snow and ice with lots of curves and wheel spins which really stress the gear type lsd.. I ground the gears to the point of just having a slipping gears instead of actual power to the wheels, hence heat and smoke.. getting a cusco RS type and parts I've ground down replaced.. I will post when done
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Old 12-31-2018, 10:14 PM   #8
killadawg
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Join Date: Jun 2015
Chapter/Region: NWIC
Location: Bellingham WA
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2016 WRX stg 4 Rally
STI Drivetrain GM

Default

I had NWRS in Bellingham drop in a Cusco 1.5 way RS. So far no more smells of burning, smoke, and the whining noise is gone.. no broken bits found? Just silver fairy dust.. pinion and ring looked fine as well. They said they took a couple pics of both diffs side by side.. let's see if Johan posts them up :-)..
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Old 02-15-2019, 02:33 PM   #9
killadawg
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Member#: 424203
Join Date: Jun 2015
Chapter/Region: NWIC
Location: Bellingham WA
Vehicle:
2016 WRX stg 4 Rally
STI Drivetrain GM

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look what we will be putting on soon!!

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