Whats the formula for boost levels and changes in elevation? I know higher elevations get robbed of HP and as you get closer to sea level you up some boost.

What is that formula? :thumbsup3: thanks

Not sure what you're asking, but if it's atmospheric pressure vs altitude, then you lose about 27 mm of mercury, or about an inch on the barometer, for every 1,000 feet of altitude. That's an approximation, but it may do for whatever it is you are interested in doing.

www.engineeringtoolbox.com/air-altitude-pressure-d_462.html gives you a table, if that's what you need.

Most blowers have a pop-off valve that holds pressure to a specific point. In aircraft, it is common to try to hold sea level to altitude, so the turbo boosts only to that level and as you climb you get no deterioration of performance, making you a LOT faster (and higher flying). Haven't played with cars so I don't know as much about them.

Not sure what you're asking, but if it's atmospheric pressure vs altitude, then you lose about 27 mm of mercury, or about an inch on the barometer, for every 1,000 feet of altitude. That's an approximation, but it may do for whatever it is you are interested in doing.

www.engineeringtoolbox.com/air-altitude-pressure-d_462.html (http://www.engineeringtoolbox.com/air-altitude-pressure-d_462.html) gives you a table, if that's what you need.

Most blowers have a pop-off valve that holds pressure to a specific point. In aircraft, it is common to try to hold sea level to altitude, so the turbo boosts only to that level and as you climb you get no deterioration of performance, making you a LOT faster (and higher flying). Haven't played with cars so I don't know as much about them.
Yes if you are turbocharged you may see an increase in "boost" at higher altitude. Boost is relative to the atmospheric pressure. Actual manifold pressure should be roughly the same though from sea level to 8000+ feet. With a turbo and definitely with a supercharger, it may lose a little manifold pressure at extreme altitudes because the turbo will be somewhat less efficient just like the engine.

With a supercharger you will have to increase the blower speed for the altitude you will be running to maintain manifold pressure.

Not sure what you're asking, but if it's atmospheric pressure vs altitude, then you lose about 27 mm of mercury, or about an inch on the barometer, for every 1,000 feet of altitude. That's an approximation, but it may do for whatever it is you are interested in doing.

www.engineeringtoolbox.com/air-altitude-pressure-d_462.html gives you a table, if that's what you need.

Most blowers have a pop-off valve that holds pressure to a specific point. In aircraft, it is common to try to hold sea level to altitude, so the turbo boosts only to that level and as you climb you get no deterioration of performance, making you a LOT faster (and higher flying). Haven't played with cars so I don't know as much about them.

:thumbsup3: