Todd - One thing that I noticed with the Nitto's is that they will slow the car down at the top end of the track. It's almost too much traction with the 225/50-16s. I switched to 225/50-15s and the BFG drag radials on 15x7.5 Kosei K1 Racing wheels.
I'm launching at about 5200RPMs and slipping the clutch aggressively. I was able to pull a 2.191 60' time and get the 1/8th mile time down to 9.987 at 69.75MPH.
Since these tires are about 1" shorter than stock, you can either run out 1st-3rd, or you can short shift 1st a little but you'll have to throw it into 4th just after the 1000' mark.
Right now, I just think both of our cars are lacking a little top end power to really get the times down. (BTW...congrats on the 15.4) The front air dam has a lot to do with that in my opinion. I actually think a 95-96 front end would be faster.
My race season is over for this year. Next year, I'll have a pair of slicks and a pair of drag radials. I'm hoping to get the motor rebuilt this winter with 11.5:1 compression on top of the rest of the mods.
97 Eclipse GS-15.463@88.57MPH - RIP 92 Talon TSi AWD-12.927@105.47MPH