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Old 12-24-2020, 10:10 AM   #1
Zeonic
Scooby Newbie
 
Member#: 490131
Join Date: Aug 2018
Chapter/Region: South East
Location: Side 5
Vehicle:
2005 Impreza WRX
WRB

Post Differential Setup for 6spd Swap

So quick background details, I'm swapping a brand new 07 STi 6Spd transmission into a 2005 Impreza WRX. The input that i'd like from the lovely forum audience is your input on the differential configuration I'm planning to set all of this to:

Front Diff: STi 6Spd Stock
DCCD: DCCDPro Spiider
Rear Diff: R160 w/ Cusco RS set to 1.5Way, 80% lockup, Stock Preload.

My configuration goal is that I need the car to be a daily driver, but also perform on track and autocross.
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Old 12-24-2020, 01:51 PM   #2
T-37
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Member#: 175624
Join Date: Mar 2008
Chapter/Region: MWSOC
Location: Wichita, KS
Vehicle:
0304 WRX WRX
SY WRB

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The r160 should work fine, as long as you're not doing frequent aggressive launches or shock loading. You may want to try a lower preload/lockup if it's going to be mostly street to cut down on rear tire and axle wear/chatter.

I'm running a similar setup in my car that gets used for autox or weekend drives 90% of the time. I have an '06 6 speed, with a r160 Kaaz 1.5 way set to 100% lock up in my '04 WRX (I haven't measured breakaway torque in it). The unit itself isn't too noisy, but the inside axles tend to clunk in tight, low speed turns (parking lots and driveways) especially if they're older and already a little worn. I've heard the Cusco isn't as bad, but it still may be a nuisance for a DD.

Less lockup in the rear would probably be preferable at autocross as well, but I wanted to try it out of the box. So far I've been pleased as it's solved my lifting the inside wheel power delivery problem.
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Old 12-24-2020, 04:51 PM   #3
Zeonic
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Member#: 490131
Join Date: Aug 2018
Chapter/Region: South East
Location: Side 5
Vehicle:
2005 Impreza WRX
WRB

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Quote:
Originally Posted by T-37 View Post
The r160 should work fine, as long as you're not doing frequent aggressive launches or shock loading. You may want to try a lower preload/lockup if it's going to be mostly street to cut down on rear tire and axle wear/chatter.

I'm running a similar setup in my car that gets used for autox or weekend drives 90% of the time. I have an '06 6 speed, with a r160 Kaaz 1.5 way set to 100% lock up in my '04 WRX (I haven't measured breakaway torque in it). The unit itself isn't too noisy, but the inside axles tend to clunk in tight, low speed turns (parking lots and driveways) especially if they're older and already a little worn. I've heard the Cusco isn't as bad, but it still may be a nuisance for a DD.

Less lockup in the rear would probably be preferable at autocross as well, but I wanted to try it out of the box. So far I've been pleased as it's solved my lifting the inside wheel power delivery problem.
The STi transmission isn't in yet, so I'm currently breaking in the rear diff on 100% lockup with the 5spd. it's not bad at all on normal driving, but I definitely have the same issue as you on feeling it on the low speed turns around corners. I'm hoping the change from 100% to 80% will fix that. I'm not too worried about noise at all, but temperatures were a concern. I'm going to swap the stock cover with an Andrewtech one to mitigate that.
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Old 01-02-2021, 12:30 AM   #4
Austin556
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Should work fine as long as the diff matches the final drive
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Old 01-02-2021, 04:34 AM   #5
Zeonic
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Join Date: Aug 2018
Chapter/Region: South East
Location: Side 5
Vehicle:
2005 Impreza WRX
WRB

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Quote:
Originally Posted by Austin556 View Post
Should work fine as long as the diff matches the final drive
Thanks. I definitely had that confirmed before I even ordered the transmission. The last thing I want is metallic soup back there in the diff lol.
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