Very unusual '7747 .bin ~ 7.4 liter / 700R4

[dave w]

I've been asked to tune an 88 Suburban 4x4, TBI 7.4 liter / 700R4. The Suburban has 46" tires, and many other upgrade$. The attached .bin files are what I currently have. As best I can figure, the original engine was a 5.7 liter not the 7.4 liter that is in the Suburban. It's very apparent the "Read" .bin is nothing like the AKUN .bin found here: http://www.gearhead-efi.com/Fuel-Inj...Information-42 . I've installed the WBO2, and found the PE is almost a perfect 12.5 AFR, but not much else is close. I suspect the vehicle has been on a dyno? I've posted the "Read" .bin because it's so very different from anything I've ever encountered!! The vehicle owner has stated, "this thing just doesn't run right... FIX IT!"

Earlier this year, I thought a Supercharged TBI 454 with a '7060 was a challenge. This Suburban is a '7747, now that's a challenge! I'd like to upgrade the ECM, but the vehicle owner travels to some very remote areas and getting service and/or parts is a concern.

I'll get some pic up tomorrow.

dave w