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I'll pass on your suggestion to Greg. I do have EGTs, they do reach 900 but that's at the end of 4th gear. They look ok. Who knows maybe they are not supposed to even reach that far. We'll find out whatever it is. : Perhaps something has gone funky and it isn't providing that extra holding pressure its supposed to.
: If its working correctly, you've got quite a bit of backpressure holding it open.. Curious, do you have a/f's or egt's in the car? If backpressure is creeping, the cylinders should start leaning/heating a bit more than normal in that pressure range.. : Or, maybe your wastegates just aren't strong enough. :) I'm just thinking outloud here. :)
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