Quote:
Originally Posted by BBS
Thats incorrect. Any pressure the turbo feeds in the inlets are positive. Meaning that are 1.5 bad above 1kpa atmospheric. So 1.5 bar is still 22psi above the normal 14.5psi
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It's not incorrect. You're both right, but you're talking about two different things.
1.0 Bar is 14.5 psi, or normal atmospheric pressure. But "gauge" pressure measures what you are speaking of: pressure above the surrounding atmosphere. Boost pressures for engines are typically given in "gauge" pressure not "absolute". So you are correct in that the actual pressure in the intake tract is 2.5 bar, but "gauge" pressure is 1.5 bar.
Good reading here including a handy diagram, which I like:
http://www.engineeringtoolbox.com/pressure-d_587.html
By the way, not sure why everyone is so hung up about the bar thing. It's just another system of pressure measurement. Certainly people are familiar with converting N-M to ft-lbs for torque and kW to HP for power, no?