I am assuming you have a new tune with the new tires?
How are you launching?? I can get a solid 2.1 with a 'decent' launch consitently, and sometimes a 2.0. I usually do a mini burn out in the water box ( which is unavoidable at my track!) stage, power brake HARD, ride the gas a little when launching then give it hell...
I HATED the 4.10s at first, but if you launch it just right they are awesome. They are very unforgiving and can spin out, lurching the rear sideways if you are not careful. You have some fat tires so you 'should' have better traction off the line. The only thing that would be effecting it would be a speedo miscalibration/tune or your gears are lower now (4.01?)
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CAI/tune, 4.10s, JBA Shorties
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13.2@103mph
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