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Message: [QUOTE="Power Hungry, post: 262660, member: 1375"] There is definitely a balance between injector volume, flow rate, and tuning limitations. The larger the volume of the injector, the larger the nozzle size required to empty the injector in the allotted time available. In this respect, it's not at all different than the 7.3L. The advantage that a 6.0L has is that the FICM controls all aspects of the injection pulsewidth and the injectors fire much quicker than a 7.3L and at a higher pressure, so it is much easier to completely evacuate an injector at narrower pulsewidth. This is why 135cc injectors make well over 400 HP on a tuned 6.0L while the 7.3L makes a measly 320-330 HP on 135cc. So it comes down to... What is the SMALLEST nozzle size you can run that will still allow you to completely evacuate the injector? At one point, injection companies were offer flow charts for their injectors which included test pressures and flow rates at specific pulsewidths. For example: 160cc/Stock Nozzles: [SIZE="1"](click on image to enlarge)[/SIZE] [URL="http://www.phptune.com/images/injector_flow_chart/160_0.jpg"][IMG]http://www.phptune.com/images/injector_flow_chart/160_0_sm.jpg[/IMG][/URL] 238cc/80% Nozzles: [SIZE="1"](click on image to enlarge)[/SIZE] [URL="http://www.phptune.com/images/injector_flow_chart/238_80.jpg"][IMG]http://www.phptune.com/images/injector_flow_chart/238_80_sm.jpg[/IMG][/URL] 400cc/200% Nozzles: [SIZE="1"](click on image to enlarge)[/SIZE] [URL="http://www.phptune.com/images/injector_flow_chart/400_200.jpg"][IMG]http://www.phptune.com/images/injector_flow_chart/400_200_sm.jpg[/IMG][/URL] 455cc/460% Nozzles: [SIZE="1"](click on image to enlarge)[/SIZE] [URL="http://www.phptune.com/images/injector_flow_chart/455_460.jpg"][IMG]http://www.phptune.com/images/injector_flow_chart/455_460_sm.jpg[/IMG][/URL] If we had charts like these on the 6.0L injectors, it would really be helpful not only for the tuner, but for the customers as well. This way everyone can make an educated decision on injector selection. It's good that this is being brought up, because it really helps to show how injector sizing and tuning go hand-in-hand. :clapping: [/QUOTE]