Quote: My gut feeling is that it's got a solid tune based on a stone-stock 5.7L Hemi. Maybe it's rich enough to use headers and a good exhaust, I ASSume that the engineers that put that tune together could see that writing on the wall. Narrow-band O2 is primarily useful in emissions calibrations to keep the cats happy, and that happens at 14.7:1. Best power and best economy both occur elsewhere, so if the calibration is ON, it ought to be a great running engine. Most narrow-band O2 cars drop in to open loop at WOT, so it's the same type of system at that point.
Clair
BTW, Daty, How's it looking for the Mini Nats? Time is slipping away over here, and the gap between what I've got to do and the time I've got to do it in keeps getting wider. I hope you're in better shape. Check out my high-dollar masking tape holder, as of about 4PM yesterday...
true, NB O2's are really only useful around stoich. but that's precisely why I'd want EFI--to have a consistant stoich part throttle A/F ratio independent of ambient temp, humidity, fuel formulation, etc. to maximize economy. WOT on most OEM systems (except maybe some of the latest ones) go open loop anyways so then you're looking at your a/f ratio only being as good as your map. buut, if open loop varies from 11:1 to 13:1 depending on humidity, bariometric pressure, ambient temp, fuel formulation, etc. it probably won't make too much difference in performance, but it would make a HUGE difference in part throttle economy (fuel mileage). as it is with my carb (600 eddie), I need to swap needles in the spring and fall as the temp drops, and the gas formulations are changed. I don't see how running open loop efi would alleviate that--except it would be uploading a "summer" map and a "winter" map.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
