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High altitude boost problems

    I have an 875ktq and am having some problems getting full boost.
The only time I can get full boost, 1.2bar, is in second gear at about
5500rpm.  I live in Colorado Springs and the elevation is about 6500ft.
Could this be the cause? What kind of boost can I run up here without
over revving the turbo?  I dug through the archives but couldn't find
that info.  TIA