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A question for Rusty, Todd or anyone else flying a turbo....
I remember Rusty saying he wanted a boost gauge that showed vacuum. I'm
about to order a boost gauge and I'm unsure what calibration I'm going to
need. Do I need vacuum? Should I be looking for a MP gauge calibrated in
inches of mg, or in PSI. Does it matter?<<<
While I'm not flying a turbo (yet) I'd suggest that you get a standard MP gauge with the ability to display as much MP as you plan on boosting up to. We have a Sierra EFIS/EAU combination on the twin-turboed Eagle 540, and it displays MP up to about 60" hg. The Sierra (Chelton) EAU is the same as the Grand Rapids Technologies EIS, and you have the option with either one to show MAPs up to 33" or 50", the difference being in which version of MAP sensor module you get with the install kit. I personally don't see any reason to have boost in PSI in an airplane, as we deal with in-hg for MAP already thanks to our altimeters. All you care about is absolute MAP anyway, just remember that 1psi of boost = about 2" hg. A regular MAP gauge will show vacuum already, just pull back the power and watch MAP drop into the teens... that's the vacuum that you'd be reading on a vacuum guage. In a nutshell, the KISS principle tells me to stick with MAP using in-hg as that's my mindset in an airplane already. I hope this helps.
<Marv>
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