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I capped the return line "pre" controller. Bypassing the controller completely. Yes, it was performing perfect for the first 3 hours. This is a brand spanking new turbo. Right out of the box too. I don't think I have excessive axle play, but something I plan on measuring today. Way I see it. Since I've bypassed the controller, going to full boost off idle, and verified shaft throw on the wastegate. I've either got one of four problems. Wastegate butterfly valve has collapsed, turbo is capuut, induction leak, or exhaust leak. Am I on the right track?
I would lean tward the wastegate valve going bye bye, since it is the oldest component on the engine. Have you ever heard of such a thing?
Richard
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