I just ran V-Day III at Summit Point and had the Magden system hooked up for the day. I recorded all of the data from my runs and the max boost recorded all day was 10.54424. Other notes from that capture moment were that the speed was 104.39 mph, the rpms were 6393, and the water temp was 239 degrees.
When you say water temp.. Do you mean ECT or the IC Coolant Temp? Do we even have a sensor for that? I'm pretty sure they are separate systems tho. Would be neat to see IC Coolant Temp vs IAT1 Vs IAT2..
Putting aside the IAT/MAT spark retard, an ECT of 239 would be pulling out an additional 2.5 deg. You really gave the V a workout!