I have doors on my XAIR
and find that the cabin pressure is definiteliy lower that outside pressure.
This affects my ASI reading and altimeter readins, as I do not have a static
line. Do you?
I did the same? Pitot
tube tilted up. But that means that as you put thte nose down for higher
speeds, the ASI will over read more, than with the nose up at low speeds. If
not done yet, do fit a static pickup and dine to your
instruments.