Quote:
Originally Posted by mmastro
FWIW, on my 77 930 I did something similar, but drilled five 2" holes in the horizontal removable piece below the rear reflector "box" and the five more 3" holes in the rear sheet metal to vent the heat from the turbo. I fitted stainless mesh behind the holes for a more finished look. Before doing this, I cooked part of my rear fiberglass bumper. The heat that moved through the holes did not enter the engine compartment.
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You didn't mention how you confirmed heated exh air isn't drawn into the fan. One way Is with a thermocouple positioned at the fan inlet with and without the holes blocked and at various veh. speeds. A red hot turbo would provide worst case results, and hot air radiated by the intercooler only adds to the cooling load. Any cooling air heated by the exh. system is counterproductive.
Sherwood