Simply convert 20 psi to Inches of Hg (its about 2 to 1 but not exactly) and add it to 29.9. So the MP should be about 69 inches, give or take depending on losses and where in the system you measure. I keep my plane less that 45 inches MP. You have to be more rich and skilled than me to go higher without detonation.On Sat, Jul 6, 2013 at 11:14 AM, Patrick Panzera <editor@contactmagazine.com> wrote: Friends,Hypothetical question. Let's say it's a standard day and I'm at sea level. I've installed a turbocharger and have also connected the stock automobile turbo boost gauge, along with my traditional manifold pressure gauge. I ground-run the engine to full throttle (where the MP would normally be reading 29.92- minus some efficiency loss) and the boost gauge is reading 20 psi.What should the MP indicator be reading? Thanks!Pat -- David LeonardTurbo Rotary RV-6 N4VYhttp://N4VY.RotaryRoster.net http://RotaryRoster.net
Friends,Hypothetical question. Let's say it's a standard day and I'm at sea level. I've installed a turbocharger and have also connected the stock automobile turbo boost gauge, along with my traditional manifold pressure gauge. I ground-run the engine to full throttle (where the MP would normally be reading 29.92- minus some efficiency loss) and the boost gauge is reading 20 psi.What should the MP indicator be reading? Thanks!Pat