I took fuel away from WOT when I went to the 2.4 and the RE fuel rails. I thought between less boost and maybe better fuel flow but I’m thinking something else now after seeing what occurred going back to my HC rails and the Whipple on the ported heads. Airflow is up a bunch in the low end, would be up top too if it were not for belt slip. What I’m thinking is with the RE rails fuel pressure was up not down as injector DC was down not up as it would be if fuel pressure was really lower. I’m still around 50% DC now at 73 psi, was 45 inj DC with the 2.4. Look back at post 1323 and1333. If my fuel pressure was really 58 psi my injector DC would have been much higher then 48% at 4700 and 55 % at 6800. I’m expecting to see my inj DC about 65% at 6800 now with the Whipple once I get the tensioner in the right spot as now it’s almost on the loose side stop shut off and get back to 23-24 psi of boost up in the 6000 rpm range, and not expecting to see fuel pressure at 58 psi either, 68 maybe but I’m thinking still 70 or better. What do I think is going on between the RE fuel rails and the HC fuel rails? A scaling issue on the fuel pressure sensor output, just like HC uses 2 bar map sensors and the RE uses 3 bars sensors and one has to rescale the sensor data to be correct, I think the fuel pressure sensor is 8-9 bar per 5 volts and the HC is less, like maybe 6-7 bar and the RE rails at 70 psi actual is reading 58. I have both sensors I just need the time to make up a pressure rig to log the voltage output of each at different pressures like 50/60/70/80/100 etc. Remember, the RE stock tune runs at what 105 psi fuel pressure, and the HC what 84? I bet the RE sensor is scaled differently. Yes, it has the same plug as HC sensor but do do the map sensors and they differ in scaling. I should be running out of pump more so now then before and I’m not, all be it boost is down atm but 4500 rpm Aircharge is way up now and the pump DC has room to go yet at the same commanded figure as running the RE rails and the fuel pressure was down to 60 psi already, I think it really was 80+ as pump was at 89% DC, ie full bore to where it really only needed 75/80% to get 73 psi commanded, it’s why injector DC % was down to 40-45% then and why now at a real 73% I’m having to put the fuel back in because it’s not 80+ psi at the injectors any more but reading 58. Follow the hypotheses I’m getting at? Maybe it’s why everyone who went to RE rails on a HC platform think their pumps aren’t keeping up. They really are but the different sensor calibration is saying different.