Last runs N/A 12's almost....
I think maybe torque management was kicking in. I would hammer it with traction control off at the line and the car would nose dive. I was able to do a burn out on the street, but the track must have been sticky in the burn out area preventing me from getting loose. I ran the tires at around 26 pounds.
Okay, so my best run today was a 13.007 @ 107.82 with a 1.935 60 foot. Other runs were in the 13.07 - 13.1x range. Maybe with some better tire heat, I could have pulled off the 12.9 and I was extremely close, although I didn't feel any tire spin at all. I should have tore out the front and rear seat and could have got it, but wanted to do it full weight. Oh, the drag radials took a little more than 2/10ths off my et vs. street tires.
So 13.007 it is, must be the quickest N/A LS4 I'm guessing. Recipe in sig....
As for your nose dive, the diff score was prolly working (one wheel spinning faster than the other, keeps it from blowing up the differential)
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