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7.3 Aftermarket
Tuning 101 - Thread Merged with Injector Posts
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[QUOTE="Charles, post: 1325291, member: 103"] Alright, after getting back today from my changes in order to increase cranking fuel allowance I have some comments... I went on a shotgun attack of anything related to lazy cranking fuel in hopes of scoring a hit and working back from there: First off, after seeing a 3 second delay with MFD at 0 in the "Cranking mass fuel adder" function, I bottomed that out at ~25 instead of 0 or 3 or whatever it was. I then set the "Cranking mass fuel desired" to 100 across the board as well. Then, in an attempt to assure available fuel allowance for cranking, I pushed the pw up at the 100 MFD point up to 4.5ms. Now I don't usually see MFD actually reach 100, so it shouldn't have ever made it there anyway.... but.... just to be sure, I also reset the "Fuel limit vs Rpm" so that anything under 800rpm had 100MFD available, and anything over capped out at 90..... seemingly removing the ability for 4.5ms of pw for any rpm over 800. The highest value at a MFD of 90 is otherwise 2.1ms. I then went into the MFD table and set everything below 750rpm to 100MFD, even all the way down to ad counts of 0. That way the truck would [i]always[/i] be at 100 MFD up to 750rpm when cranking, even if everything else failed. The good: Truck cranked IMMEDIATELY this morning. Cranking within a second and cranked extremely firmly and super stable. Turn the key and WAACK.... it's running. Awesome..... a win there... The Bad: My 90 MFD cap to keep the truck from ever seeing that 4.5ms at 100 MFD when actually running failed to catch... I had forgotten all about it and was getting on the interstate. On the 3 lane onramp I was behind a semi, and as we turned onto the ramp from the surface street I stepped out and went around him. As I rolled on and waited for the converter to lock in 2nd everything was cool. Then when I rolled on the power the truck sounded waaaaay different like a glitch or something. Turbo sounded loud, and the trans wouldn't lock in. I immediately lifted, like less than one seond, and then rolled back on after 3rd gear locked in... same deal, loud scream from the turbo and the trans felt like the converter was unlocked, rpm blew straight through. I looked behind me to see where the rest of the cars were just as I was merging into the interstate and IMMEDIATELY saw the problem and remembered the pw table..... because the ENTIRE ONRAMP was BLACK AS NIGHT! This truck runs clean as a whistle at full song otherwise... OBVIOUSLY my poor PMR and stock trans just saw 4+ms from a 300/200 at 3000+psi. Yowza.... The turbo was probably at 40 to 50lbs for a second if memory serves me from years gone by. Trans had NO chance... So.... How on earth did the truck see that cell in the pw table at 100 MFD when I had the fuel vs rpm capped at 90 MFD at anything above 800rpm??? Luckily no green fluids have shown up in the floorboard, and no loud noises and rotella went anywhere from under the hood. Thoughts? [/QUOTE]
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