Hoping ITA can answer a nagging issue that I've had over the past few seasons: boost pressure shows pretty high. Very traditional setup: roots blown 526 KB hemi, Veney fuel heads. Blower is a pretty nice Critchley built 14-71 hh superman. 37tooth lower pulley, 30 tooth upper: 1.23 drive ratio for blower. About 9000RPM at top end. Combo was put together 3 years ago, have had this issue since day 1. Boost numbers show over 50psi during the run (anything above 8400engine RPM gives 50psi or more boost). I have been told that is just not very likely--but cannot figure out what is going on. At first i thought it was an issue with my data collection/calibration--but i've checked the boost sensor on multiple occasions and it has been right on (static pressure test: screw the sensor into a known pressure source and see what the computer reads; done at multiple points between 20psi and 60 psi). Data snip attached; note the top data bar which shows numeric values at the cursor placement (right at the end of the run). Boost sensor is screwed into front of manifold next to rupture plate (below top blower pulley). Passes have been relatively good, 6.50s at 220s. 2650lb door car. Fuel system flowed by Randy Anderson. Passes have been getting faster as I have continued to lean out the system, as would be expected when starting on the rich side. Anyone out there know of what can be causing a backup of pressure in the intake manifold? Where do I go hunting? I do have a fair amount of data for reference.