107* hot and muggy is a bad air day.... :lol:
What happens is when these conditions are pressent, there is less oxygen in the air, and the water takes up a lot of room also, so the motor gets less oxygen to burn then on cooler less humid days...
IF you keep the jets the same the motor is running rich, as it still pulls the same fuel from the carbs, but now has less oxygen. Some guys make the mistake of jetting up in hopes of gaining et, /mph, but they only make it worse.
Ideally, you should lean the carb down to get the best mixture for the day for the best times/mph of the day.
You will never get the same power as on a good day, but you can get the best for the day at hand..
A simple density gauge can work wonders in plotting out conditions and jet changes over time, so after a while you can have a good idea of what you need for the day.
IF you keep an eye on what the prostock guys run all over the country, you will see that some places the run fast, otheres slower. Its all about track and weather conditions, altitude plays a big factor here too, and getting the car to make the best power for the location and conditions of the day.
You will never go as fast at denver as you will at gainsville....