[ByronRACE]

I was working on my tuning laptop today, and found some data to show you. This plot shows RPM and ACT (air charge temp) for a drag pass on a 9 second 347" small block mustang running a cogged V7-YS making 20psi @ 7500.

The reason for the two groups of data is that the lower grouping is low gear, and the second grouping is high gear. I just plotted all "WOT" data...this is how it turned out.

I specifically went looking for data with temperatures hotter than 180deg F and was suprised to find this extreme case...I do have data hotter than I thought. At 6000rpm on the initial spin-up, the temperatures hit about 180deg F at 16psi at 6000rpm. As the rpm and boost climbs further, it rises to 220deg F. In high gear, he's hitting 250deg F and goes through the traps at about 7000rpm.

This is all WOT data, and a 20psi cog configuration. His initial temperatures from 1100 to 5000RPM are all under 150deg F. From 5K to 6K, the temp starts taking off. My guess is that your temperatures are somewhat higher because of the part-throttle high-rpm you encountered during your logs. Considering this is 7500rpm and 20psi, and 250deg F...it does still seem odd that you're hitting 280+deg F at 6000 with 15psi though. I would expect your data to look more like the 6000rpm area of this plot, which is 100deg F cooler than your data.

I'm hoping that with half the boost pressure, I'll see a lot less temperature. I don't think it's unreasonable to think that if 20psi@7500 = 220-250deg air, 10psi@6500 yields < 160. I guess I won't know until I run it. Here's hoping.