UpRev AFR differences between banks?
 

Hey guys,
I am seeing different AFR from bank 1 to bank2 due to differences in the MAF voltages. So I tried to correct this by increasing the value in the MAF fuel table for bank 2. It doesn’t seem to make a difference. So I tested to an extreme by increasing the cells surrounding the .86v by 100 (actual increase in value, not percentage) but I still see no change in AFR for that bank. I followed the tuning guide supplied by UpRev. Can someone that has experience with UpRev give me some guidance? thank you.

1) Is MAF sensor A correspond with bank 1 and MAF sensor B with Bank 2?

2) Am I able to balance the AFR’s by using the MAF fuel table, or do I need to use the fuel trim table?

How re you gathering your AFR reading? is there s sniffer in the exhausts or a reader directly in a bung on each cat?

From my experience any digital read outs your seeing from the cars computer should be disregarded. I had nothing but issues with my tune till we used an actual sniffer or took readings directly from the cats.

your computer is not changing the AFR for each side of the engine based on the 2 different MAF. its using the readings from both MAF sensors and coming up with a equal in the middle so each cylinder is getting the exact AFR. try increasing the values in both MAF sensors and then you should see a serious spike.

Thank you for the response. I was basing my info from the reading through the obd2 port. I just received my innovate LM-2 from amazon. I will be installing the widebands into my berk HFC’s within the coming days. Hoping the afr’s are balanced between the banks.

How off are they AFRs? At idle mine was average 14.4 bank 1 and 14.7 bank 2. If it's something like this I really wouldn't be worried about it. I searched for a good bit trying to find Intake leaks/ exhaust (header) leaks that could affect the sensors but I never found anything. Probably just something really small that's making the difference and would be difficult to find if it's only a small difference in AFRS. Like posted above the reading coming from those sensors can be iffy too.

It was around .3-.5 variation between banks . i have been able to close the gap in many places with the maf tables. I feel like nissan should have used a larger gauge wire for the maf that is further from the ecu, as I am sure the wire resistance is the reason the ecu is seeing different voltages.