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If your inlet air is at 85F and your making 6.5psi of boost, then you're absolutely correct that the HE isn't doing much work if your IATs are approaching 145F.
The inlet air going into SC is probably 10-20F higher than ambient, so the 145F looks a bit better, is there any restriction to the airflow going to the HE? Is there any air in the coolant possibly restricting the water flow?
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2010 2SS/RS M6 CGM E-Force + 2015 1LT V6/A6
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