UpRev AFR differences between banks?

macneil187 · 10-12-2017, 09:49 PM

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?

Cranberry · 10-13-2017, 09:13 AM

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.

Cranberry · 10-13-2017, 09:15 AM

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.

macneil187 · 10-14-2017, 11:36 AM

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.

Wilson2608 · 10-17-2017, 04:33 PM

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.

macneil187 · 10-26-2017, 08:51 PM

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.

10-12-2017, 09:49 PM	#1 (permalink)
macneil187 Base Member Join Date: Jun 2017 Location: Baltimore, MD Posts: 13 Drives: 08 infiniti G37s m6 Rep Power: 8	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?

10-13-2017, 09:13 AM	#2 (permalink)
Cranberry Base Member Join Date: Aug 2016 Location: Winnipeg Posts: 89 Drives: 2009 370Z Touring Rep Power: 702	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. __________________ 2009 370z M/T - straight pipe cut outs / motordyne test pipes & intake manifold / K&N typhoon intake / ACT stage 2 race clutch & flywheel / ZEX wet nitrous / UpRev tune / stillen race oil cooler / 317 WHP N/A - 381 WHP with ZEX www.youtube.com/danialk ///\\\///\\\ Follow me on Instagram @dankobra

10-13-2017, 09:15 AM	#3 (permalink)
Cranberry Base Member Join Date: Aug 2016 Location: Winnipeg Posts: 89 Drives: 2009 370Z Touring Rep Power: 702	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. __________________ 2009 370z M/T - straight pipe cut outs / motordyne test pipes & intake manifold / K&N typhoon intake / ACT stage 2 race clutch & flywheel / ZEX wet nitrous / UpRev tune / stillen race oil cooler / 317 WHP N/A - 381 WHP with ZEX www.youtube.com/danialk ///\\\///\\\ Follow me on Instagram @dankobra

10-17-2017, 04:33 PM	#5 (permalink)
Wilson2608 Enthusiast Member Join Date: Dec 2014 Location: Nashville Posts: 301 Drives: Nissan 370Z Sport Rep Power: 11	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. __________________ Stillen G3, z1 Intake Manifold, Stillen Headers, Z1 HFC's, Stillen Catback. 330whp 267 ft- lbs tuned at Z1 motorsports.

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10-14-2017, 11:36 AM	#4 (permalink)
macneil187 Base Member Join Date: Jun 2017 Location: Baltimore, MD Posts: 13 Drives: 08 infiniti G37s m6 Rep Power: 8	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.

10-26-2017, 08:51 PM	#6 (permalink)
macneil187 Base Member Join Date: Jun 2017 Location: Baltimore, MD Posts: 13 Drives: 08 infiniti G37s m6 Rep Power: 8	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.