I haven’t been able to find much specific or accurate info on this. With how linear the actual vs requested boost curves are on the graph I feel like maybe nothing is wrong here, I’m just compressing thin, high altitude air and that poor little k03 just can’t meet requested numbers. In colder weather up to 219 g/s.This is something I’m wondering about. When I run my piggyback module (Neuspeed) at the +8 setting I typically see 210 g/s. Would altitude make that much of a difference? Your are at 7,000 and I am at 540. I routinely see 165 g/s with a completely stock engine. The highest flow I see that you recorded was 170 g/s. I don't know what I can add to this discussion other than an observation on your MAF log. thought I had it solved when I fixed the boost leaks but sadly no! I am open to any suggestions of other possible causes, not looking forward to dropping test pipe to check waste gate. I would hope the turbo would not be bad at 66 k miles, and know my intake and exhaust are not clogged. I guess it is possible that I have a bad map sensor also. IE suggested looking for leaks, intake clogged, exhaust clogged, faulty manifold flaps, carbon cleaning, or bad turbo as possible causes for not meeting demand. Also thinking about max's external spring mod ( ) did that on tt and worked well but think it will be more difficult to do on the Avant. Need to go do some more logging but next thing I think I need to check is wastegate. Was leaking on one of the charge pipe connections and at the map sensor at that time couldn't get over 16 psi now exceed demand initially then quickly fall below demand.
Fixed some boost leaks and logs look closer to Perry's now.
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