Mr. Wright,
The Torsen differentials that FRPP sells and the models that we sell are not the same.
The Torsen differentials are customized to Ford's requirements for instance. You'll have to compare the specifications on each
website to see what the differences are.
The T2R we sell has a higher TBR than the True-Trac. This is important in any situation where there is a lot of lateral weight
transfer. If the car corners hard enough to end up with a 80% of its weight on the outside rear tire and 20% of its weight on the
inside rear tire, then the differential needs a TBR of at least 4:1 (80%/20%). This is so it can delivery 80% of the engine torque
to the outside tire which has much more weight on it for more potential traction. If the TBR in this case was only 3:1, then the
differential would send 33% of the driveshaft torque to the inside tire which would result in its spinning while the outside tire
still had excess torque capacity. The T2R has the highest TBR of any aftermarket differential. For autox use, where there is very
high lateral weight transfer this is very important. The more cornering grip is available, the more weight transfer and the more
important having a high TBR is.
As a torque biasing differentials wears, the TBR decreases some. So its better to start out with a TBR that is higher than may be
needed when in doubt.
The only application where I've ever seen a Torsen break is in drag racing. We've used them in ever Mustang we have here and never
broken one. We don't drag race any of the cars, but we have done plenty of 0-60mph testing for various uses, but never on slicks.
