3.8 Cfi , More Air July 14, 2006, 11:04:13 AM I thought id mention something about my 5.0 CFI compared to the 3.8 CFI.All the factory did was bore out the butterfly holes. The 3.8 has 35mm bores and the 5.0 has 39.5mm. All you would need to do is split the cfi in half by removing the screws, choose which butterfly you want off an old carb, bore out the holes and install the butterflies. It will easily bore out to 45mm on each bore. Quote Selected
3.8 Cfi , More Air Reply #1 – July 14, 2006, 11:37:09 AM Good info. I've been following your builup. Can't wait till it's done! Quote Selected
3.8 Cfi , More Air Reply #2 – July 14, 2006, 12:47:33 PM Without anyway to tune the A/F, what does that really gain you? Quote Selected
3.8 Cfi , More Air Reply #3 – July 14, 2006, 01:07:14 PM Yeah, it'll be interesting to see what the end product is.35 mm butterflies = 1925 mm^239.5mm butterflies = 2450 mm^2; 27% larger than 35mm45 mm butterflies = 3180 mm^2; 30% larger than 39.5mm; 65% larger than 35mmThe EEC probably can't handle more than 10% more air/fuel before it maxes out the adaptive strategy. I'd guess the 39.5mm butterflies are more than enough for the 3.8L CFI. Quote Selected
3.8 Cfi , More Air Reply #4 – July 15, 2006, 11:13:53 AM Quote from: Chuck WWithout anyway to tune the A/F, what does that really gain you?The CFI has and adjustable fuel pres regulator.I thought the info would be helpful for those with the V8 cfi systems as well. Quote Selected
3.8 Cfi , More Air Reply #5 – July 15, 2006, 01:09:17 PM Well, tweaking the f/p will only do so much. Being able to tune the pulsewidth would be more advantageous. Good info though. Quote Selected
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