chp03bcd Posted September 8, 2007 Share Posted September 8, 2007 I am sure there is a simple answer to this... As far as i am aware turbos are essentially an air pump that puts more air into the cylinders - forced induction. If this is the case the air being 'forced' should be under positive pressure. Why then are the stock turbos quoted as running somewhere around 0.7 bar? To my understanding 0.7 bar is less than atmospheric pressure (1 bar) and so is actually less pressure than a normally aspirated engine would run at. The only thing i can consider is that the 0.7 bar figure is what is added by the turbo so the 'real' figure may be around 1.7 bar? Where are my numbers not adding up and what am i missing?!! Link to comment Share on other sites More sharing options...
merckx Posted September 8, 2007 Share Posted September 8, 2007 The pressure is relative to atmospheric pressure which is about 1 bar. The absolute pressure at full boost would be approximately 1.7-1.8 bar. Link to comment Share on other sites More sharing options...
chp03bcd Posted September 8, 2007 Author Share Posted September 8, 2007 Excellent, thank you! Link to comment Share on other sites More sharing options...
merckx Posted September 8, 2007 Share Posted September 8, 2007 "Gauge pressure" is the pressure relative to the local atmospheric or ambient pressure. Link to comment Share on other sites More sharing options...
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