LC1 AFR not logging correctly
#1
LC1 AFR not logging correctly
Hello all,
Im trying to log my AFR.. it doesn't let me review it right in the log viewer in evoscan. I tried using 2.7 and 2.8. I have Lc1 tapped into rear O2. Using formula that comes with evoscan..... Priority 1, response bits 2.
Attached is a pic of how it looks.
thank you guys.
Im trying to log my AFR.. it doesn't let me review it right in the log viewer in evoscan. I tried using 2.7 and 2.8. I have Lc1 tapped into rear O2. Using formula that comes with evoscan..... Priority 1, response bits 2.
Attached is a pic of how it looks.
thank you guys.
#4
Evolved Member
It's just the analogue voltage jiggling a bit. If I feed in a constant voltage, eg. 1.0 volts fixed, the ADC sees it jiggling up and down by +/- 0.1V.
On mine, I've got it interpreting 0V as 10:1 and 5V as 15:1... which means it's accurate to around 0.1 AFR - certainly good enough for me to tune to!
But accuracy would start to become a real issue if you wanted 9:1 <-> 18:1 range. That 0.1V jiggle would really start to hurt for a wider range.
Hope this helps!
Rich
PS. I'm not actually feeding in analogue to the rear-o2. Instead, I've patched into pin 8 of the OP2.0 itself. Seeing as our graphs look so alike, it's quite possible the jiggle is right back at the LC-1 analogue source, rather than an issue at the ADC (ECU, OP2.0). I'm sure we've both got our respective groundings and wiring good.
On mine, I've got it interpreting 0V as 10:1 and 5V as 15:1... which means it's accurate to around 0.1 AFR - certainly good enough for me to tune to!
But accuracy would start to become a real issue if you wanted 9:1 <-> 18:1 range. That 0.1V jiggle would really start to hurt for a wider range.
Hope this helps!
Rich
PS. I'm not actually feeding in analogue to the rear-o2. Instead, I've patched into pin 8 of the OP2.0 itself. Seeing as our graphs look so alike, it's quite possible the jiggle is right back at the LC-1 analogue source, rather than an issue at the ADC (ECU, OP2.0). I'm sure we've both got our respective groundings and wiring good.
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