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On steady cruise other threads here have suggested we can run a little more lean. I am running about 13.8 idle, up to as lean as 15.5 cruise at low loads, lowering AFR to 13.2 just under the point where boost comes on, 13 at boost threshold, and then dropping quickly and getting richer down to 12.2 afr under full boost.
Adjusting AFR may be worth considering, if you have the ability to do this.
Every setup is different, though, so experiment to find what is safe for your engine.
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Emery
1988 930 coupe - Silver Metallic
TurboKraft 3.3L 8:1 CR, SuperSC Cams, GT35R, B&B Headers, TK intercooler, Tial WG, ARP, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ... 
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