AFR difference between the banks

Mitco39 · 10-15-2014, 09:27 AM

Quote:

Originally Posted by jwick

This is on my todo list for the V1.75 upgrade. Bought the plugs to be able to pull them completely!

yeah.... i been lazy...

roplusbee · 07-08-2014, 11:35 PM

That makes me sad. How am I supposed to pass emissions testing if I have to disable my O2 sensors to get the car to not flip out?

gendr777 · 10-15-2014, 12:34 AM

Not sure if this issue is still circulating about the forum. I was having the same issue. Bank 1 and bank 2 were always off by 0.5-0.7. An accidental wipe of my rom file lead me to this series of adjustments which virtually eliminated the disparity.

1) I downloaded a different rom from uprev by accident. I flashed the 2013 370 NISMO file 1A40D instead of the one my ecu was supposed to match:1A39D.

2) I began running all uprev programs as administrator.

3) I edged up my injector latency value at 14V a bit (added 0.3ms).

That's it. Like the majority of useful medications on the market, this was a serendipitous discovery. I hope this helps at least one other person.

Peace.
-JMC

flashgordon · 11-05-2016, 11:25 AM

Reading this thread I am looking also in my engine a little differences between banks: 0.5-0.8 AFR, but only in 1800-3600RPM Full Load area!

In this case, it's better to tune all richer maintaining all Bank1 & Bank2 MAX AFR below 12.7, or I must consider a mid value?

...after 4000RPM everything the AFR was balanced...

Some positive feedbacks removing the O2s?

Thanks.

flashgordon · 11-06-2016, 02:13 PM

Quote:

Originally Posted by flashgordon

Reading this thread I am looking also in my engine a little differences between banks: 0.5-0.8 AFR, but only in 1800-3600RPM Full Load area!

In this case, it's better to tune all richer maintaining all Bank1 & Bank2 MAX AFR below 12.7, or I must consider a mid value?

...after 4000RPM everything the AFR was balanced...

Some positive feedbacks removing the O2s?

Thanks.

The two banks are pretty close, but in the 3250RPM area, there is a difference

Two examples:

ihiryu · 11-09-2016, 10:56 AM

flashgordon · 11-09-2016, 01:10 PM

Quote:

Originally Posted by ihiryu

....mmh! I know....

My question is:

If you have an AFR balanced on the entire range, but only around 1800-3600RPM Bank1 differs from bank2....

What do you do? ....disconnecting O2s (The lambda after the cats) is the solution?

ihiryu · 11-09-2016, 05:54 PM

Hmm that is strange.

Here's a silly question, but is your MAF voltages during that area? Wonder if it's possible that the MAF's are reading slightly different from one another?

flashgordon · 11-10-2016, 05:19 AM

Quote:

Originally Posted by ihiryu

Hmm that is strange.

Here's a silly question, but is your MAF voltages during that area? Wonder if it's possible that the MAF's are reading slightly different from one another?

Interesting!

....this weekend I can try to swap the 2 sensors....

ihiryu · 11-10-2016, 11:32 AM

Try it and report if the AFR dip changes between the banks.

I would also double check to make sure you don't have any vacuum/air leaks post MAF. I would imagine a vacuum leak on a MAF based system could make things run funny.

07-08-2014, 11:35 PM	#2 (permalink)
roplusbee A True Z Fanatic Join Date: Dec 2009 Location: Killeen, TX Posts: 2,360 Drives: 2007 350Z NISMO Rep Power: 23	That makes me sad. How am I supposed to pass emissions testing if I have to disable my O2 sensors to get the car to not flip out? __________________ 2007 350Z NISMO #0618: Zerolift \| UPREV \| F.I. \| Greddy \| Competition Clutch \| Injector Dynamics \| Aeromotive \| Pioneer \| JL

10-15-2014, 12:34 AM	#3 (permalink)
gendr777 Base Member Join Date: Jul 2013 Location: Texas Posts: 8 Drives: 13 Nissan 370Z BK M6 Rep Power: 13	Serendepity solved this one for me. Not sure if this issue is still circulating about the forum. I was having the same issue. Bank 1 and bank 2 were always off by 0.5-0.7. An accidental wipe of my rom file lead me to this series of adjustments which virtually eliminated the disparity. 1) I downloaded a different rom from uprev by accident. I flashed the 2013 370 NISMO file 1A40D instead of the one my ecu was supposed to match:1A39D. 2) I began running all uprev programs as administrator. 3) I edged up my injector latency value at 14V a bit (added 0.3ms). That's it. Like the majority of useful medications on the market, this was a serendipitous discovery. I hope this helps at least one other person. Peace. -JMC

11-05-2016, 11:25 AM	#4 (permalink)
flashgordon Premium Member Join Date: Sep 2009 Location: Italy Posts: 146 Drives: 370z Rep Power: 17	Reading this thread I am looking also in my engine a little differences between banks: 0.5-0.8 AFR, but only in 1800-3600RPM Full Load area! In this case, it's better to tune all richer maintaining all Bank1 & Bank2 MAX AFR below 12.7, or I must consider a mid value? ...after 4000RPM everything the AFR was balanced... Some positive feedbacks removing the O2s? Thanks. __________________ HFC Berk - CAI Stillen GEN3 - Catback Nismo - ECU reflash with UpRev - Clutch South Bend Stage II daily with ZSpeed HD CSC - Setrab Oil Cooler Kit with Mishimoto Thermostatic Plate Gold - PJMu Brake Pads - Oil Pressure Gauge GlowShift - TPMs Hella TC400 - Steering Lock disable switch by me - OBD Link MX with Asus Nexus & Torque App

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11-09-2016, 10:56 AM	#6 (permalink)
ihiryu Base Member Join Date: Oct 2016 Location: TX Posts: 141 Drives: 2013 Nismo 370z 6MT Rep Power: 34

11-09-2016, 05:54 PM	#8 (permalink)
ihiryu Base Member Join Date: Oct 2016 Location: TX Posts: 141 Drives: 2013 Nismo 370z 6MT Rep Power: 34	Hmm that is strange. Here's a silly question, but is your MAF voltages during that area? Wonder if it's possible that the MAF's are reading slightly different from one another?

11-10-2016, 11:32 AM	#10 (permalink)
ihiryu Base Member Join Date: Oct 2016 Location: TX Posts: 141 Drives: 2013 Nismo 370z 6MT Rep Power: 34	Try it and report if the AFR dip changes between the banks. I would also double check to make sure you don't have any vacuum/air leaks post MAF. I would imagine a vacuum leak on a MAF based system could make things run funny.