Not sure if it's the hotter than usual temps weather wise, i've got a new problem or changed something without realising it.
But...
When the car is warming up or sitting at cooler running temps ECT wise everythings fine. However when sitting for a while or the ECT temps get upto 100% my AFR's plummet and it sits idling at 10:1. STFT's swing full negative but have no effect. I've tried changing the charge temp bias even slashing the VE table but nothing I do effects the AFR which insists on sitting at 10:1. I'm running Siemens 60lb injectors so though it might be a low pulsewidth issue, so tried reducing the fuel pressure and compensating with the flow rates to try and up the pulsewidths but no luck.
I'm running out of ideas so would appreciate any new ones. Once the car's cooled right down everything's good again, but does almost seem to be a slowly degenerating problem after startup.
For background:
- supercharged LS2
- SD tune, no MAF.
- siemens 60lb injectors (scaled tables)
- boost referenced regulator (was set at 58psi base, tried 50 per above)

Attached the current tune and a recent log file showing warm startup (fuelling good), and eventual hot condition running super rich.

Any guidance much appreciated

Thanks

2016_001_0005 low fuel pressure.ctzLog_P15RSX_P15RSX_0079 low pressure.efi