boost fade / air fuel

[WowZer]

89 2.5 t1, auto, 3 bar map, stock injectors, intercooled, grainger valve, all new vacuum lines with clamps on a vacuum block, dsm bov, little mitsu turbo. cannot get it to hold at 15-16psi. on wot will hit 15/16 max then fall off to 12. is this due to a weak waste gate can? even with the wastegate line unplugged still maxes at 15/16. air fuel gauge always in blue (rich) even with stock injectors. Using d-cal 3bar cal. i suppose it could be a leak but have triple checked all hoses and clamps. any other suggestions besides the can?

[tryingbe]

With stock injectors, you don't want to go over 15psi unless you like melted pistons.

[WowZer]

got some +40s putting in. was just trying to work out boost issues before i change something again. weird part tho is even at 15 (momentarily) the a/f gauge (dawes) was blue,blue,blue, never even a yellow flicker. with the stock cal and 2 bar the a/f would always be at yellow at wot at 13/14 psi. assuming the custom cal is running rich?!? but for testing now i want it rich until i can start tweeking after everything is installed/updated.