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F.A.S.T. Ez efi
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<blockquote data-quote="greenlion" data-source="post: 452823" data-attributes="member: 1675"><p>The running rich with open headers will happen with all "self learning" efi systems. Header reversion sucks air back in past the O2 sensor causing it to read false lean. It then adds fuel to get the AFR it's programmed for. You would have to manually tune the lower RPMs.</p><p>I have the Holley HP EFI system on mine and it did the same thing. It is manually tuned below 1500 rpm now and runs perfect. I don't have experience with the FAST system, but would recommend the Holley setup. Software is easy to use and it's very flexible. There is a knowledgeable guy (Doug F.) on some of the forums that can help out too. I did have a bad ECM once, which Holley replaced for free, out of warranty. HTH</p></blockquote><p></p>
[QUOTE="greenlion, post: 452823, member: 1675"] The running rich with open headers will happen with all "self learning" efi systems. Header reversion sucks air back in past the O2 sensor causing it to read false lean. It then adds fuel to get the AFR it's programmed for. You would have to manually tune the lower RPMs. I have the Holley HP EFI system on mine and it did the same thing. It is manually tuned below 1500 rpm now and runs perfect. I don't have experience with the FAST system, but would recommend the Holley setup. Software is easy to use and it's very flexible. There is a knowledgeable guy (Doug F.) on some of the forums that can help out too. I did have a bad ECM once, which Holley replaced for free, out of warranty. HTH [/QUOTE]
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