I have no direct experience with the Torsen center diff mod, but I strongly believe a rear LSD will have a huge effect on how much difference the center diff will make.

I know you have mentioned this in your example but I want to stress this. On corner exit, you have

10-20 =30
25-45 =70
35-65

By having an open front diff and LSD rear diff in this case, you have less traction relatively up front which helps the Torsen to send more power to the rear and let you be able to use the extra available bias.

Now with an open rear diff, the torque split in this example would be less since now the rear will see relavtively less of the car's total traction compared to before.

Also the front and rear traction split is not really just 30/70. Since there's more relative weight transfer along with more roll stiffness in the rear, actual traction will be realatively less than 70 in that case(efficiency of tire traction reduces as load increases).

My point is more bias in the center diff definitely helps either you do have an open or LSD in the rear. Having an rear LSD will help a lot more. Actually IMO a rear LSD should come before the center diff mod. I believe having a high performance suspension system and chasis setup is more important than this modification.

I am looking at doing this modification but I am considering either getting a rear LSD first or doing them both. If you don't mind, what kind of LSD are you running? %lock? 1way/1.5way/2way?

Thanks,