1) Clutch slipping? 2) Not enough boost? (you never mentioned how much) 3) Extra weight in the car? (affects ET for sure, not sure about traps) 4) Boost leak(s)? 5) Ambient temperature? 6) Timing retarded?
And none of those factor in the driver or the launch or the tires. Hmm...
Z-Jay Edmonton Z Car Club 93 300ZX TT - Stage VI 01 Sentra SE - daily driver