The PCM relies on air density figures, not necessarily boost, to determine when to open the wastegate. This way, at higher altitudes and higher temperatures, it allows a litte more boost to compensate for the lower air density.
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\"If I had a diesel rig, with a big ol\' blade, courtesy would reign, arguments abate, cuz everyone would know, I\'d SQUASH \'EM LIKE A GRAAAAAPE!\" -- Heywood Banks, \"If I Had a Bulldozer\"
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