Here's what lovely and charming Marlene (OM617.952) does for boost.

Slight grade in third gear (remember, she's a manual), 650ft MSL, 48°F

1500 RPM, approximately 1/3 throttle, holding speed on grade: 5-6 psi
1800 RPM, approximately 1/3 throttle, accelerating on grade: 6-7 psi
2000 RPM, approximately 1/3 to 1/2 throttle, accelerating: 8-8.5 psi
2200 RPM, approximately 1/2 throttle, accelerating: 8.5-9 psi
2500 RPM, approximately 3/4 throttle, accelerating: 9-10 psi

Level ground, drifting (1/8 throttle) at 1800 rpms generates about 3-5 psi.

FWIW, my wastegate opens fully at approximately 10 psi; I may change it to spec someday.

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Never a dull moment at Berry Hill Farm.