Converting boost from bar into psi...
Pressures
1 bar = 14.504 lbs/sq.in = 100,000 pascals = 29.53 in. of mercury
1 lb/sq.in. = 0.0689 bar = 6.895 kilopascals = 2.036 in. of mercury
1 kg/sq.cm = 14.223 lbs/sq.in. = 0.981 bar = 98.066 kilopascals
Taken from the Burton site
1 bar = 14.504 lbs/sq.in = 100,000 pascals = 29.53 in. of mercury
1 lb/sq.in. = 0.0689 bar = 6.895 kilopascals = 2.036 in. of mercury
1 kg/sq.cm = 14.223 lbs/sq.in. = 0.981 bar = 98.066 kilopascals
Taken from the Burton site
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Originally Posted by o n i o n
1 bar is about 14.7 psi
If you want it accurate its :-
1 bar = 14.5037738 pounds per square inch
The diffference most people get confused with is gauge pressure and absolute pressure.
Pressure measurements may be expressed relative to various zero references. Absolute pressure of a fluid is referenced against a perfect vacuum. Gauge pressure is referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure. Atmospheric pressure is typically about 1 bar at sea level, but is variable with altitude and weather. A standard value of atmospheric pressure has been defined to be 101.325 kPa. If the absolute pressure of a fluid stays constant, the gauge pressure of the same fluid will vary as atmospheric pressure changes. For gauge pressures several times larger than atmospheric pressure, this variation is small as a percentage of reading and may be ignored.
Examples of absolute pressure measurements include barometric pressure, altimeters, and the Manifold Absolute Pressure (MAP) sensor used in the engine control systems of modern fuel-injected cars. Examples of gauge pressure measurements include tyre-pressure gauges and sphygmomanometer.
Pressure measurements may be expressed relative to various zero references. Absolute pressure of a fluid is referenced against a perfect vacuum. Gauge pressure is referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure. Atmospheric pressure is typically about 1 bar at sea level, but is variable with altitude and weather. A standard value of atmospheric pressure has been defined to be 101.325 kPa. If the absolute pressure of a fluid stays constant, the gauge pressure of the same fluid will vary as atmospheric pressure changes. For gauge pressures several times larger than atmospheric pressure, this variation is small as a percentage of reading and may be ignored.
Examples of absolute pressure measurements include barometric pressure, altimeters, and the Manifold Absolute Pressure (MAP) sensor used in the engine control systems of modern fuel-injected cars. Examples of gauge pressure measurements include tyre-pressure gauges and sphygmomanometer.
Originally Posted by mattbibs
thats weird - a lad round here is adament that 1 bar = 25 psi and his car is running 2 bar as i said mine was running 1.7!! 

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