This is what Nitto told me for my Challenger.
Based on the information provided, the calculated inflation pressure for your tires is 29 PSI cold pressure.
For drag radials, a burn out is recommended in order to bring the tire temperature up between 160-220 degrees. At the track it is advised to start with 20 PSI and decrease in .5 increments till you get your desired result. You do not want to go any lower than 15 PSI as this may result in rim slip.