I think you need both.Will putting a cooler on the Diff solve the problem of overheating or does it just need thicker oil or some combination of the two.
Reason I ask is because the PP1 cars have a torsen and the non pp cars have clutch type. Not sure if that makes a big difference in the heat generated or in What is required to make it through the day on track.I think you need both.
My 2019 GT PP started with no diff cooler. I wrapped the exhaust and swapped to 140wt for track use. Survived 20min sessions with fan cooling in the paddock between sessions. 265F temp on track. But it reached 290F limiting at 32min mark during a test.
This summer I added DIY diff cooler to drop track temp to 230F steady during a 45min test. I kept the 140wt.
My approach is to use a viscosity chart for street operating temp (~100F) and oil (75w5/85), and then project to track temp (230F), and it shows the heavier weight is still needed for the same viscosity.
My engine and oil cooler holds 11 quarts.
My diff with oil cooler holds 2 quarts.
Both run at 230F.
Two of the most important aspects.Oil control is what aides in Road racing Coyote failures. That other link you shared is a perfect example of spending all the money in the wrong places. People need to stop buying parts online and slapping everything together. Balance and Clearances keep being the red flags of these failures.
No proof, but experience in other cars would lead me to believe the torsen creates quite a bit more heat than the Traction-Loc. Having said that, it also does a hell of a lot more work.Reason I ask is because the PP1 cars have a torsen and the non pp cars have clutch type. Not sure if that makes a big difference in the heat generated or in What is required to make it through the day on track.