Wide Bands??

art leong · 08-28-2013, 05:44 PM

I run 2 wide band AFR probes. One ( Innovate) is in cylinder 4 pipe about 12 inches from the exhaust valve. The other AFX is in the beginning of the collector.
I realize the AFX will not be accurate at low rpms due to location and cam overlap.
But even at higher rpms the AFX is consistently showing a richer mixture. An example is at 6000 in high gear the Innovate will show 14.5 while the AFX will show 13.2
Seems like if I tune off the AFX to a 13.2 (or so) number the car runs best.
I doubt one cylinder could be that much leaner. I have swapped the injectors, and each cylinder has it's own throttle body (all equal).
I've been led to believe that if the wide band sensors are functioning they are working.
Is this normal to have numbers this far apart?

08-28-2013, 05:44 PM	#1
art leong VIP Member Join Date: Dec 2001 Location: Richmond Hill, Georgia Posts: 2,003 Likes: 0 Liked 1 Time in 1 Post	Wide Bands?? I run 2 wide band AFR probes. One ( Innovate) is in cylinder 4 pipe about 12 inches from the exhaust valve. The other AFX is in the beginning of the collector. I realize the AFX will not be accurate at low rpms due to location and cam overlap. But even at higher rpms the AFX is consistently showing a richer mixture. An example is at 6000 in high gear the Innovate will show 14.5 while the AFX will show 13.2 Seems like if I tune off the AFX to a 13.2 (or so) number the car runs best. I doubt one cylinder could be that much leaner. I have swapped the injectors, and each cylinder has it's own throttle body (all equal). I've been led to believe that if the wide band sensors are functioning they are working. Is this normal to have numbers this far apart? __________________ Art Leong 2095 SS