BOOSTED have you ever measure the temperatures before the inter-cooler?
It seems to me that most of these turbo love a pressure ratio of 15psi at the 500hp to 600hp range.
Low pressure ratios (1.6 or near 10psi) at 500hp to 600hp seem to be operating in the low efficeincy areas of the compressor maps.
Perhaps I may be missing something.
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