Torsen T2R Issue

[Trublu]

OK, back on the phone to Torsen.

If a solid axle assembly has a total available traction (limited by tire traction) of X+Y with X being the light or unloaded inside wheel and Y being the loaded outside wheel then the T2R can transfer 4 times X across to Y. This is because the T2R has a torq bias ratio of 4:1.

There's a catch.... If the light wheel is unloaded and off the ground then be definition it has zero traction and therefore 0 x 4 is still 0 and no torq will be transfered. This is because the diff is limited slip with a high bias ratio but not a true locking differential.

Trick is keep traction to both wheels and the key is in roll stiffness.

[Trublu]

Forgot to add, it stands to reason that once the torq transferred to the outside wheel is greater than the traction of the tire then white smoke will appear.

[nasa-rm]

OK, back on the phone to Torsen.

If a solid axle assembly has a total available traction (limited by tire traction) of X+Y with X being the light or unloaded inside wheel and Y being the loaded outside wheel then the T2R can transfer 4 times X across to Y. This is because the T2R has a torq bias ratio of 4:1.

There's a catch.... If the light wheel is unloaded and off the ground then be definition it has zero traction and therefore 0 x 4 is still 0 and no torq will be transfered. This is because the diff is limited slip with a high bias ratio but not a true locking differential.

Trick is keep traction to both wheels and the key is in roll stiffness.

Ok. Time to resurrect an old thread. When I got the Mustang back, they had replaced the trac-lock with a T2R. I hate it with the current setup. I get nothing but a spinning inside wheel in the air. This was painful at TWS exiting T4, through the carousel and exiting 14.

Michael, I need to look at your roll stiffness at ECR and figure out how you are keeping the rear tire on the ground.

Or, I need to put the trac-lock back as it seemed to work quite well. Easy enough to freshen every few years.

[MikeP99Z]

If the inside wheel is spinning, the torsen is done.

[ShadowBolt]

Dave,

I have had a really stiff set-up (1000/275) and a really soft set-up (whatever I have now). With either set-up my T2R does not do the one wheel peal. When I had the T-Lock it was a problem every two or three weekends. I'm looking forward to ECR with the T2R. With the T-Lock, even with brand new clutches my car would spin the inside wheel like a MoFo in turn seven. That is a climbing left hander after the long back straight. I'm guessing something is wrong with your T2R.

JJ

[marshall_mosty]

I guess I like the KISS principle, but I've used a stock Track-Loc in my AI car and have to reshim every 5-6 weekends. Not too bad really for what a rebuild costs. Each "refresh" really is just adding shims. I built the car in 2003 and only did a fresh rebuild then. Every other teardown has just been to add shims. I did utilize the alternating stackup and NOT the OEM stackup.

[nasa-rm]

If the inside wheel is spinning, the torsen is done.

I'll pull the cover when I get a chance. If it is toast, I will go back to the trac-lok. Never had an issue with it and only changed oil once (no reshim) in three years (or 20 days or so of race time).

[Suck fumes]

Make sure you have the right T2R. They make two models, one being more aggressive than the other. Running a stiff vs soft setup will not make any difference on a good diff.

[michaelmosty]

Dave, it sounds like a T2, not T2R.
I bought a T2 for mine back in 07 thinking it would work fine w/ the low HP. It ended up being a piece of crap and spun the inside tire everywhere. I ran it for 2 events and then replaced it with the T2R. The T2R has been great for over 5 years now.

On a side note, I still have the T2 in its original bag and box if anyone would like to buy it. It is a great piece and will do awesome in any race car!! ;^)

[ShadowBolt]

Make sure you have the right T2R. They make two models, one being more aggressive than the other. Running a stiff vs soft setup will not make any difference on a good diff.

I agree with Aaron about the stiffness not making a difference. At least it has not for me in my two cars.


JJ