Quote:
Originally Posted by roosterk0031
What did you do to convert the 4.3 to FFV, zr2 truck for sale near by w/5 speed is tempting me & what's it mpg with E85?
I need to figure out how to get those fuel trim setting out a SG2.
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Not much really, at first I put a
Flex Fuel "kit" on it... what this device does is adjust the length of injector pulses by + or - 15% and lets your o2 delta do the rest. Brilliantly simple and it operated beautifully on that for ~40k miles. I then started looking for more power & kinda felt like tinkering so I had the stock ECU reprogrammed by
wait4me with a map I specified after studying the software they use (and a few other tweaks) and at the same time replaced the old fashioned poppet type injector setup with the 2004+ style new injectors - and due to the new ECU program I installed a higher flow aux. fuel pump inline to maintain pressure at WOT - all of which negated my need for the FuelFlex kit that had been previously installed. I have another ~30k miles on those modifications with no difficulty, and simply love the way it runs on ethanol blends.
Note that I had zero trouble with the "kit" and if I hadn't wanted to do more tinkering, I would still be using that kit today and have no doubt it would continue being trouble-free. I already sold the kit I removed to a friend, but if you buy that ZR2 & are interested I have a second GM 4.3 fullflex kit that's never been installed, would be happy to sell it for a mutually agreeable price.
As for MPG's, it should be noted that my aerodynamic profile is a little different due to the 5" of suspension lift and the live front axle hanging below the frame ( from the factory these vehicles have independent suspension in front and a smoother underbody profile) and I also undertake literally zero effort whatsoever to "hypermile" my drivign habits - on ordinary E10 pump gas I usually get about 275-320 miles before topping with 17 gallons, and though I don't frequently get to run back-to-back fills of e85 (to ensure it's really e85 not some blend in the tank).. scangauge and partial refills have indicated that I average around 16-17mpg on straight E85, and closer to 18mpg on blends I estimate live around e50