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Peter from your data the turbine pressure (17.1psi) is very close to the boost pressure (17.7psi). Is this what you normally find, within a pound difference?
Also your AFRs in the mid -11s at 17 psi is leaner than I would have thought. My EGTs are so high (1000°C) that I have been adding extra fuel trying to cool the temps.
Barry
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