That's interesting, thanks for sharing. Maybe trans temp could have something to do with why your first run is the fastest? Presuming you had an auto, if your trans was heating up the torque converter could be slipping more and wasting more power?
Originally Posted by Rhymingmechanic
When I drag raced, it seemed like my first run of the day was always the best, whether I drove the car 40-45 minutes to the strip or trailered it. Maybe cooler air earlier in the day accounted for some of that, but I also noticed better ETs with coolant temps at 180 or lower compared to 185 or higher. This was with a fairly mild Pontiac 400.