It all depends. A good starting point is about 14psi
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Joel 1988 Mustang LX 5.0
R302 (310ci), Vortech V-1 Si-Trim, Stock Cam, TFS Heads and Intake, C4, Snow Stage 2 Meth Injection Tuned By Kurgan Motorsports
9.97@132 on 93 octane PUMP GAS and 275 Radials! Faster times to come!
TSDRA Hot Street #44
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u might not be so much on psi..when u say its not hookn u dont have alot rocks stuck on your tire..or maybe even try heaten em up a lil longer thats always fun..i have the same tire, same car and mine hook great..and to see if there heated enough when u get out and touch the tire it should be like theres glue on it to your hand
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89 notch LX white..bbk headers, bbk in fender CAI 3.73's M/T ET street, sub frame connectors, MAF,suspension work..
i ran mine at 14 yesterday at the track and can't get them to hook either... i think it's mostly because i'm not getting them hot enough like you were saying... i'll try that glue touch thing you mentioned
Step 1 Drive around the water. Keep the front tires dry, Otherwise, your heated rears will drive through the water trail left by wet fronts on the way to the line.
Step 2 Back into the damp area, not the wet area. Back up enough to get 3/4 or more of the tire tread damp. Don't spin the tires in the water. You just want to get most of the tread with a sheen of water.
Step 3 Roll forward to the leading edge of the damp area. Start the burnout there. Do NOT roll so far as to put the rear wheels onto the heavy sticky rubber/VHT prepped area. The car should start and finish the burnout with no more that a foot or so of forward movement.
Step 4 Put the tranny in 2d gear. This will enable the tires to heat faster, because they’ll spin at a higher indicated mph. Since the tires are damp, they spin quite easily in 2d. Some owners prefer first gear. And that's OK.
Step 5 Rev the motor to 3500 and pop the clutch. Immediately lightly apply the brakes with your left foot. The brakes help keep the rear-end from walking sideways.
Step 6 Bring the rpm to about 5000 and hold it there until the drag radials smoke strongly and start to drag down the rpm. At that point, back out of the throttle and release the brakes. You'll roar forward. The tires are heated. For stock tires, spin them only to first smoke. It is helpful to adjust the driver’s outside mirror to view the left rear wheel/smoke.
Practice will help get the synchronization of the foot movements.
You can practice in a level asphalt parking lot with water from a couple gallon jugs.Draw a couple lines with chalk to help establish an alignment guide. Pour out three or four gallons of water generally at the wheel points. Voila. You’ve got a pseudo water-box. An observer/spotter is a plus.
Do this at your own risk.....
__________________
Reggie
Real Racers Don't Street Race
PERIOD.......
'88 LX Hatch With A Little Of This & A Little Of That...... 10.39 @128 MPH Soon to be faster....
Step 1 Drive around the water. Keep the front tires dry, Otherwise, your heated rears will drive through the water trail left by wet fronts on the way to the line.
Step 2 Back into the damp area, not the wet area. Back up enough to get 3/4 or more of the tire tread damp. Don't spin the tires in the water. You just want to get most of the tread with a sheen of water.
Step 3 Roll forward to the leading edge of the damp area. Start the burnout there. Do NOT roll so far as to put the rear wheels onto the heavy sticky rubber/VHT prepped area. The car should start and finish the burnout with no more that a foot or so of forward movement.
Step 4 Put the tranny in 2d gear. This will enable the tires to heat faster, because they’ll spin at a higher indicated mph. Since the tires are damp, they spin quite easily in 2d. Some owners prefer first gear. And that's OK.
Step 5 Rev the motor to 3500 and pop the clutch. Immediately lightly apply the brakes with your left foot. The brakes help keep the rear-end from walking sideways.
Step 6 Bring the rpm to about 5000 and hold it there until the drag radials smoke strongly and start to drag down the rpm. At that point, back out of the throttle and release the brakes. You'll roar forward. The tires are heated. For stock tires, spin them only to first smoke. It is helpful to adjust the driver’s outside mirror to view the left rear wheel/smoke.
Practice will help get the synchronization of the foot movements.
You can practice in a level asphalt parking lot with water from a couple gallon jugs.Draw a couple lines with chalk to help establish an alignment guide. Pour out three or four gallons of water generally at the wheel points. Voila. You’ve got a pseudo water-box. An observer/spotter is a plus.
Do this at your own risk.....
use this method and you can launch as hard as you want and still stick...they will stick so you can lift both front tires off the ground (if you have enough power of course).
Drag Radials? 
How to Do a Burnout 
