How does cold weather affect boost pressure ?
12-12-2003, 09:53 PM
#3
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Colder compressed air will have a lower pressure.
Colder weather changes other things outside and inside the motor, which then changes the boost you see inside the intake manifold.
Colder air = denser air = more 02 = more vacuum = loss of boost pressure inside the manifold
Colder temps outside also changes adjusted altutude and barometric pressure which also changes the amount of vacuum inside the cylinder. So full boost - more vacuum = less boost on gauge measured in intake manifold.
Colder air = denser air = more 02 = more vacuum = loss of boost pressure inside the manifold
Colder temps outside also changes adjusted altutude and barometric pressure which also changes the amount of vacuum inside the cylinder. So full boost - more vacuum = less boost on gauge measured in intake manifold.
12-19-2003, 08:51 AM
#4
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The main reason boost pressure drops is due to the increased density of the air because
this results in more O2 per unit volume. The ECU adjusts boost because of this according to its map. It also adjusts fuel delivery, etc. The ECU has no control over vacuum. The intake and the cylinders only see vacuum under NO BOOST conditions.
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