Originally Posted by
VTuner
Bill,
FYI-
I have an update on the overboost problem one of my customers was having. I had him log some data under 2.23beta so I could see the Boost DC%, desired boost, and absolute load (boost PIDs are still not present in 2.22). With this data it was clear that he was exceeding the desired boost by 12-15% for several seconds before triggering the overboost code. So, it appears that there may not be a pressure limit for triggering overboost like I insinuated, but a time factor for a certain percentage over desired boost. I think you can cross this one off your list, but I still need help with the max maf flow of 240g/sec issue resolved.
It looks to me like the overboosting customer is having some issues with his boost control solenoid and/or his wastegate diaphram. The issue appears to go away when it is warm out or after his engine is warm on cold days. From the data, the boost solenoid is trying to open further (Boost DC%) but the boost is not dropping. Once the engine is very warm, the max loads under WOT drop and the overboost condition is not triggered.
Thanks