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gmonde · 08-19-2019, 06:51 PM

under full throttle (2 step,leave ,pull thru the gears) your o2's will read .50-.75 leaner than if you had a full exhaust,, I am 12.5 - 13.0 between the left and right side banks ,now if I moved the o2 up to the primary tubes it will be richer but only measure that one tube ,but it will be more of accurate #,, so its a test and tune deal ,,you have to dial your et vs you afr = et and mph ,yeah 12.5 is your target but its subject to how your combo reacts (that my take on my set up)
tom goldman has some experience in this wheel house

08-19-2019, 06:51 PM	#4
gmonde Senior Member Join Date: Nov 2007 Posts: 615 Likes: 56 Liked 165 Times in 59 Posts	Re: O2's in collectors under full throttle (2 step,leave ,pull thru the gears) your o2's will read .50-.75 leaner than if you had a full exhaust,, I am 12.5 - 13.0 between the left and right side banks ,now if I moved the o2 up to the primary tubes it will be richer but only measure that one tube ,but it will be more of accurate #,, so its a test and tune deal ,,you have to dial your et vs you afr = et and mph ,yeah 12.5 is your target but its subject to how your combo reacts (that my take on my set up) tom goldman has some experience in this wheel house