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In my opinion Loosening flapper will make it running richer. Try to imagine example this: you runnig on highway steady speed at 5000rpm.lets say that flapper is about 40% open. Now when you loosen that spring the flapper will be more open at that same situation(driving steady 5000rpms) lets say...

i dont get it why to open that afm and make flapper move lighter (aka loosen flapper spring) because it makes mixture going more richer.if you look that dyno chart you see air/fuel mixture already going too rich 3500rpm 12.0-->5800rpm 11.5. I have been said that most power is made at air/fuel...

i tuned it to around 12.4:1 and heres my afc settings: 2500rpm +2 3000rpm +3 3500rpm -1 4000rpm -3 4500rpm +2 5000rpm -5 5500rpm -10 6000rpm -17 6500rpm -28 well,it really hits rich at close to redline. im just wondering is it safe to tune close to 13:1 at 5500+ rpms? i mean i need...

Hi,first at all sorry my bad english. I have -89 mkIII(7mge) supra manual with following mods: K/N fipk Apexi afc-neo Plx-devices sm-afr+dm5 (wideband+meter) custom exhaust base timing 12` im starting to tune that safc and i made measurements in highway before i made any...