I participated in another 1/2 mile event on the 23rd of june and logged 4 of the runs. I haven't compared them to logs from the prior 1/2 mile event but I saw the IAT's reach 172º at 140 mph at the end of the run. I was spraying a 60/40 mix of water alcohol. It was 95º ambient air temperature and hotter on the runway. Starting IAT's were 115º, some runs a little more and some a little less. After the 3rd to 4th shift they were at 140º and seemed to pause a moment before continuing upward. Speaking plainly, the water injection isn't helping much, if at all. One observation of interest. I sat idling for at least 30 minutes with the air on while the photo cells and timing equipment were trouble fixed and my IAT's dropped to 10º over ambient. I never see less than 20º over in normal driving. What's it mean? I'm not sure. Knowledgeable speculation welcome.

Les