I upgraded to the 275 nozzels and set to 2500 psi opening pressure. Great power increase but the timing is retarded too much ( I also ground the fuel collar off and turned the screw about 1 1/2 turns in) with the higher opening pressure. I set the pump before injector upgrade to .95mm . With the timing retarded it has hard warm start and rough cold start. I returned the opening pressur to 2200 psi now cold start good and warm start good. Does anyone have experance with how much to change the timing with the 2500 psi opening pressure. Or do I need to experiment? I do have a old Volvo diesel timing light but dont what to set timing to. Any advice would be great. I have plenty of injector shims of all sizes and the Volvo pop tester.
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