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Also make sure that your map isn't requesting boost that you car can't deliver; remember that it will get hot and the turbos won't be able to pump as much hot air as they can when the IC is working cold. Which means you have to taper the boost at higher rpm more.
I don't know what the threshold is but when I had my car trying to hold more boost to redline it would get 30FF at the track @ high rpm now and then; since I changed the map to taper the boost down following what the turbos can actually do, it doesn't throw that code anymore. I still get about the same amount of boost to redline, but the requested boost isn't 2-3psi higher than the actual, which is what causes the 30FF.
Hope this helps, my .02, etc
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