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WinRice WinRice is offline
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Join Date: Jun 2005
Location: Colorado
Posts: 700
If the gage is calibrated to sea level, it will read a negative pressure at higher altitude, let' say for this example -0.2 bar. The waste gate is a dumb device with a set spring pressure. If it's set at 0.8 bar of boost that's 0.8 bar above the atmospheric pressure where it's located. One side of the waste diaphragm opens to the atmosphere.

So in the above example, IF the gage is calibrated at sea level that's 0.8 -0.2 = 0.6 on the gage.

I live at 6400 feet, and deal with this all the time.
1986 911 Turbo
3.3L, K27HFS, Tial 46mm, TurboKraft Intercooler, 964 Cams, Monty Muffler, MS3Pro Evo, M&W Ignition, Zietronix WBO2 Data Logger, Wevo shifter, coupler and motor mounts.
Old 05-30-2014, 09:56 AM
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