greychevy
Senior Member
I went to the track Friday night to do some data logging and get everything dialed in before we start having the good weather. I was running consistent 13.8s and 1.9 60s with the DA being around 1500. My previous best back in April, with 1350 DA, was 13.3 and high 1.7 60s. I wasn't expecting a new PB in the 1/4 but was expecting at LEAST the same 60'. On the 13.3 pass I had stock shocks, 265 street tires on 4x4 17s, and was shifting at 5700rpm. Since then, I installed rancho 9000XLs on all corners, 28" DRs, am shifting at 6100rpms, and rear 2" drop springs. Take a look at the slips and let me know what you guys think....the left is my pass back in April and the right is the best from last night.
Assuming that you did everything the same as before (1/4 tank gas, launch technique, etc) the only other change was to your shift points. Since you are running the stock cam, shifting at 6100 rpms might be to high. I could see that helping with a stock torque converter to help with shift recovery but since you have a 3000 stall maybe the higher shifts are taking you out of the powerband on the top end then if you are only dropping back to 4500 after the shift you may be losing a little on the bottom end. From what i have read the stock cam peaks at 5600 and really drops off at 6000. You could try some runs back at 5700 and see what happens.
