so i decided to stick with the sc400 diff which is a 3.9 it worked out fine, I went to the dyno and tuned this past friday made 505 hp and 435 ft lb/torque on 25 pounds pump gas on a stock 1jz

 

what size turbo? what ecu? 25 lbs is pushing it .. if that thing overboost it will spike to 30 and there go your engine.
That's nice power you got there any do you happen to have the graph? i am glad you like the diff.
You now have a street fighter.

 

i am still on super afc2 , masterpower t70 turbo, and im goin to turn the boost dwn ,the only reason its not down is bec i need to change that old unstable manual boost controller, how much lbs you think i should do? i have the graph ill take a pic and upload it in a sec

 

here are some pixs

 

I have a question, I was told if i went with the sc400 rear end from 92-96 with the 3.92 ratio, they said it has a type of LSD but not. Like both wheels do spin but one starts first. Any fan confirm.before I drop cash into a V8 diff?

I have a 1jz on boost with r154. And i do plan to put down north of 480hp with injectors and safc2. Maybe FPR.

 

I'm not sure about the LSD question but the 1jz with a 3.92 ratio will be in fact fun to drive especially with your goal. This gear ratio is close to the 2 the mk3 supra guys use.

 

Sc4 diff doesn't have an LSD, it's the right gearing for your R154 it's fun to drive.

 

Sounds good enough. My SC came with an automatic drivetrain. The only thing left is the pumpkin. So all I gotta do is score a sc400 diff. I sure Like to plant both wheels on the ground tho. *sigh*