Originally Posted by
stew86MCSS396
As stated above bro's truck is a 1992. Started just fine on the oem '299 computer but very rich. Swapped to '747 ecm w/ 5.7 manual truck bin EGR delete and changed BPC to 115 for 74# injectors. Much better smell at the exhaust. Didn't put a scanner on it and sent him home with that. I know, I know what am I waiting for. There's way more on the table since we're talking peanut cam vs. L98. He just notified me he had issues climbing a grade. My thoughts for hit it out of the ball park tune is to start with a L98 cam bin, however closest thing to that would be '746 Caprice cop car. Only wiring difference between the two, is the IAT/MAT sensor. Tried comparing the VE tables and very different. Internet searches had varying opinions of what the IAT does. Am I wrong to think I can import the '746 map into a '747 map? Another possible route is take the deleted EGR wiring repin A4 to C12 and run with the '746 sans EGR and BPC change. I know it still needs to be tweaked for the vortec heads but just wanted to kick some ideas around before the week ends and I won't see him til next week.
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