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Message: [QUOTE="Charles, post: 1325101, member: 103"] I didn't do anything different when I tuned AD's for the first time in this gray truck a while back. Set pulsewidth based on smoke and power. I honestly don't care if it's split or single. A split shot might as well just be an injector with a small nozzle. Nothing dramatic about the difference. The main thing with tuning for the first time (IMO) is do NOT sit and spend hours dicking with programs on your desk. Don't make changes that you aren't [i]testing[/i] in a running vehicle. Otherwise you'll spend a fortune in time for [i]nothing[/i]. There is [i]no way[/i] to figure out what does what without driving down the road each time. Not even close. You'll be 180 out on a million things. Secondly.... Always bare in mind the conceptual flow of the ford PCM for a 7.3 and don't ever step out of line or you'll just chase your tail to no end. It goes from your right foot, which is the Mass Fuel Desired map, your right foot (pedal voltage run through an analog to digital converter yielding "Analog to Digital Counts", which are the numbers on the axis opposite rpm). From there you hit the Injection control pressure desired map, which is then based on the MFD value you [i]just[/i] set and rpm. From there you get Fuel injector pulsewidth, which is based on the ICP value you [i]just[/i] set and the MFD value you set earlier. That is the order. MFD, ICP, PW. That is the conceptual sequence that gets from your right foot, into the cylinder for a given engine rpm. Start of injection independently decides when all of that times up with the crank. Everything else works to trim those based on other things, like temperature and pressure. [/QUOTE]

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