So after running at road atlanta last week after installing headers, my top speeds at the end of the straights are down about 3 mph vs being there last fall, I've got a lot of data comparing getting out of turn 7 at different speeds getting on throttle etc, and the car is just slower. The IATs was around 93-94 on track vs 74 back in the fall, coolant temps about the same at 217 at this tt event as I was shooting for 2nd and 3rd laps times. Another friends stock car in the fall was only running 208 temps and was going a few mph faster as well. In watching some other viper videos they are getting to around 157 leaving the corner at around the same speed and i was hitting about 153, and my 153 was a bit deeper than the 157s. One thing im actually good at is getting of corners, that is generally how i set up the entry. I could go deeper basically because the lack of speed.

On a dyno the headers did pick up good mid range power about 45-50hp and some top end power 25-30 hp, but those are controlled runs. On track I feel i basically got nothing but better sound and maybe less power because of the heat? The car has an arrow pcm as it did last fall as well. This is pretty aggravating and I'm not sure what is the cause. According to the timing tables and iat/ect i may have been pulling around 6-8 degrees of timing. Just looking for some input, car has arrow/comp coupe pulley, arrow pcm, arh headers with cats, and a dei heat shield. I just purchases a ron davis radiator to see if it does anything or not, no one really seems to know for sure on track, maybe its something different i dont know, car seems to run just fine, but not really making anymore power. Thanks