Autocross Differential, what do you use?
Thread Starter
Staging Lane
Joined: Jul 2014
Posts: 97
Likes: 0
From: Saline, MI
Autocross Differential, what do you use? So looking for some responses, preferably from the ESP crowd on what differential your using. My car I just bought had a old school torsen T2R and it appears to have given up on me today.
Looking at getting it fixed and race ready for the SCCA national championship next week. So what seems to be the diff of choice these days? I heard something about the newer T2R's being weak.
Looking for some quick input, thanks.
Looking at getting it fixed and race ready for the SCCA national championship next week. So what seems to be the diff of choice these days? I heard something about the newer T2R's being weak.
Looking for some quick input, thanks.
Launching!
Joined: Jun 2011
Posts: 291
Likes: 2
From: Richmond, ON, Canada
I run in ESP for our national events up here.
i've got the auburn racer's unit...it locks well but does not have the same bias as the T2R from the research i've done. The idea behind the T2R is def more attractive being a helical gear instead of clutch/cone...but that is only when it works. Like yourself, i also read about Torsen T2R have "metallurgy" issues...so i passed on it.
Auburn also has the exchange program which is what makes it attractive...and less expensive.
i've got the auburn racer's unit...it locks well but does not have the same bias as the T2R from the research i've done. The idea behind the T2R is def more attractive being a helical gear instead of clutch/cone...but that is only when it works. Like yourself, i also read about Torsen T2R have "metallurgy" issues...so i passed on it.
Auburn also has the exchange program which is what makes it attractive...and less expensive.
Eaton clutch posi seems to be doing well for people. I have a fresh auburn racers in the car. It's ok at best. On the weak side if you ask me, and you need the exchange program because the cone clutches wear so quickly.
Thread Starter
Staging Lane
Joined: Jul 2014
Posts: 97
Likes: 0
From: Saline, MI
Well since I was in a last minute bind and the shop already had one, I went with a Detroit True Trac. Supposedly according to Eaton it has the 4:1 torque bias just like the T2R and from online and the local CP Turbo Coupe they are good at taking abuse. I guess i'll see how it works out, if it's junk i'm going to the Auburn
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When my T2R housing cracked its case and spilled the worm gears into the diff (I think this was maybe in 2007), I went to the Auburn Racers Differential on Sam Strano's recommendation and the reports of T2R quality control issues. I think I still have the Auburn LSD, never sent it back to Auburn for repair at least... but I stopped autocrossing in 2009.
Same question as the OP, are the new T2R's as good and reliable as they ever were in the past?
Same question as the OP, are the new T2R's as good and reliable as they ever were in the past?
From what I gathered doing research this summer, the reliability is not good. Same metallurgy issues. I even asked around during a NASA race because the mustang guys like that diff, and they even said reliability is an issue. And that's with the 8.8 rear, much stronger than our junk.
Launching!
Joined: Jun 2011
Posts: 291
Likes: 2
From: Richmond, ON, Canada
Launching!
Joined: Jun 2011
Posts: 291
Likes: 2
From: Richmond, ON, Canada
a sticky set of 315s will make everything work harder....much much harder.
the install manual for the auburn stated that their racer diff was tested with 80w-90 fluid with the additive, so that's what i'm using...
I run the TruTrac in mine on 275 Rcomps. I like it, of course I don't know any different other than it feels light years better than the stocker.
I track day, not auto x
I run 85-90 fluid with no additive.
I track day, not auto x
I run 85-90 fluid with no additive.
On a side note for the guys with the auburn- try running it without the additive. Most of us who don't run it have found it tightens up the diff and the cone clutches last longer. The additive allows too much slip. Always use Dino oil too, synthetic is too slippery. You can get some clutch chatter and noise if you get it really hot (race hot, not 20 minute HPDE session hot), but once it cools it goes away and there are no negative consequences.
Thread Starter
Staging Lane
Joined: Jul 2014
Posts: 97
Likes: 0
From: Saline, MI
Well thanks for all the info guys. Based upon my budget racing it seemed the True Trac was the most cost efficient for the abuse. It didn't disappoint either!
Fastest Fbody in ESP at nationals! 5th place out of 37 overall (.420 out of 1st) and fastest ESP time on East course and 1st place index out of 274 on East course for Wedneday.
The true trac did require a little more finesse and even counter steer in speed corner where the T2R inspired a little more confidence, but I plan on keeping it and seeing how long it will last.
Fastest Fbody in ESP at nationals! 5th place out of 37 overall (.420 out of 1st) and fastest ESP time on East course and 1st place index out of 274 on East course for Wedneday.
The true trac did require a little more finesse and even counter steer in speed corner where the T2R inspired a little more confidence, but I plan on keeping it and seeing how long it will last.
Well thanks for all the info guys. Based upon my budget racing it seemed the True Trac was the most cost efficient for the abuse. It didn't disappoint either!
Fastest Fbody in ESP at nationals! 5th place out of 37 overall (.420 out of 1st) and fastest ESP time on East course and 1st place index out of 274 on East course for Wedneday.
The true trac did require a little more finesse and even counter steer in speed corner where the T2R inspired a little more confidence, but I plan on keeping it and seeing how long it will last.
Fastest Fbody in ESP at nationals! 5th place out of 37 overall (.420 out of 1st) and fastest ESP time on East course and 1st place index out of 274 on East course for Wedneday.
The true trac did require a little more finesse and even counter steer in speed corner where the T2R inspired a little more confidence, but I plan on keeping it and seeing how long it will last.