I'm nto saying any of the other suggestions are wrong. I agree with them actually. But to give a referance. In my currently slow car(whch is slowly getting work done it so don't laugh at my E.Ts) I ran last January at about 60*low humidity. I ran a 15.3 @ 91 Mph... Then I did some stuff to the car in the mean time. I went back out in august and ran my car again, in 100+* weather. My track lock was going out on my car though, I had a vacume line disconnected I hadn't noticed plus a few other little odds and ends. I ran a 15.3@92mph. So in a nutshell just looking at the times, it seems like I did all this work to my car over 8 months and only gained 1 mph and no E.T. when in reality I overcame the odds of a failing track loc, and leavign teh lien with one tire spinning, the disonnected vacume line, and a few other things. Like I forgot to readjust my lifters after I let them pump up when I installed them so they were out of adjustment. Not to mention there was over 40* different in air temp and a huge differrence in humidity. Obviously I gained soem HP along the way. Ahh yes I forgot to mention I also had rao racing springs in my car for the aug run so I had no weight transfer. Usually tracks have a web site, you can look up the elevation there. If you are tryign to better yoru times, then always run the same track and note the temp. Most tracks will anounce the temp from time to time. I'm hoping to drop my car into the 13's here with in the few weeks. I have made many more changes.
Mark Thompson PSCA Mustang Maddness 37
84 Mustang GT, Vic jr intake, quickFuel Q650 double pumper, GT40heads, TFS stage1 cam w/ 1.7RRs, NOS crosshair plate, BBK X-pipe, TKO 500, aluminum drive shaft, sub frame connectors, MSD Digital 6 Plus box, 3.73 gears