M/T tire pressure?

[BW Jones]

I just got a set of M/T street drag radials (275/50/15) for my 87 GN. I went to the track last night and couldn't get any traction with tire pressure in the 18-20 psi range. What is the optimum tire pressure for these things to hook?
Thanks for any help.

 

[XXQUICK6XX]

Tire pressure

I run 14 psi in mine and got a 1.62 60' but my car don't leave that hard.

Steve