I'm really buggin' now, still running 17's I noticed it dropped about .2 every run, so that has to be the weather factor, but I'm still not quite topping out where I should. I'm pulling consistant 2.6 60's but my first(and still best unfortunately) run had a 2.6 and I still ran a 16.67 what else could be causing this performace lag? I had about a half tank of gas, vs a little under a quarter in my best run. Also could it be my plugs? I'm not sure when they were changed last. Any help would be greatly appreciated.

I would say a plug change will do you good. Get a set and change them when you egt there as you let the car cool down. Also the less gas the better as each gallon weighs right around 8 lbs. Did you drop your tires pressure at all?? I just went for the first time ever Saturday and those are some of the things I did. I know that I REALLY need to clean my TB out and either gut or get a high flow cat seeing as mine has 103,000+ miles on it. Best I could get was a 16.521 with very shitty 2.7-2.9 60' times seeing as how like an ass I kept forgetting to slip the clutch and just kept dumping it and spinning my ass off from the line. My trap speeds were in the 85-86 range though so I know with some better launches I can get the times down a bit. But turbo is in the very near future along with a freshly rebuilt head and P&P TB....so next time should be very nice....:)

do you have an auto or manual?

Practice will help the most. You need to work on getting that 60' time down, then the times will drop