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Old 03-06-2012, 06:18 PM
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Question EGR and Turbo question

Just wondering if or what the egr valve has to do with how and when the turbo boosts. I guess I'm really asking what tells the turbo when and how much/little to boost?
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Old 03-06-2012, 06:56 PM
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the EGR valve acts like a median between intake and exhaust pressure. Obviously when exhaust pressure is high and the egr valve opens that pressure will flow towards the intake side. Ideally you always want EBP higher than boost. When a 6.0 overboosts you will often times get a popping through the exhaust which is boost pressure blowing back through the EGR valve.

The PCM constantly monitors EGR flow and will command VGT duty cycle to optimize exhaust backpressure which in turn helps promote EGR flow.

The MAP sensor is the primary input to the pcm for turbo boost. it can monitor boost and vary the VGT to keep it under control, it's when the VGT sticks that the PCM loses control of boost pressure and an overboost condition can occur
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Old 03-06-2012, 07:18 PM
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My turbo goes ape **** one minute and runs perfect the next this crap is drivin me crazy
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Old 03-06-2012, 07:32 PM
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In all seriousness it's probably sticking. There's never a bad time to clean one of these turbos
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Old 03-06-2012, 07:36 PM
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**** this is a new turbo with 600 miles on it
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