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Originally Posted by dh58
Thank you! Great explanation! And I don't think you're saying 20-21psi on stock turbos? Don't they cap out at about 17-18psi?
What is the DC bit? (I get the wastegate bit)
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You can most defintely run 21psi on stock turbos but like Edwin says, only in the midrange, not all the way up top. Up top there's no point because the restrictions make it not worth it due to the diminishing returns.
From memory when I had stock turbos I was running about 18psi at redline but for the longevity of your turbos that's probably not the best idea.
DC is dutycycle. Basically how hard the wastegates are working (closing) in an attempt to hold the boost at the target level. The lower the wastegate DC the better it is for your turbos.