stall on a turbo car is finiky.. more rpm = more boost = more power = more stall..

 

What rear springs do you have in it? Do you have MT DR's? What kind of air pressure?

 

stock 5 liter gt springs and im running the mt et drag radials at 12-14 psi hot

 

i was having a problem hooking with hoosier qtp's started at 14 psi tire pressure, and reduced until 10 psi( was afraid to go too low for fear of eating the wall) and netted the same damn 1.85 60' almost every time (about 8 runs). last time out to the track 1st run 10 psi 1.8 60' came back said hell with it put 8 psi went back out and whamm!! 1.59 60' from there consistant 1.61-1.63 last 6 runs. i couldn't believe the last 2psi would make that much of a difference. dont know if this could help you since you're on different tires than me.

 

MINE