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AFR difference between the banks

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...

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Old 10-15-2014, 09:27 AM   #1 (permalink)
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Quote:
Originally Posted by jwick View Post
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...
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Old 07-08-2014, 11:35 PM   #2 (permalink)
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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?
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Old 10-15-2014, 12:34 AM   #3 (permalink)
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Wink 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
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Old 11-05-2016, 11:25 AM   #4 (permalink)
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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.
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Old 11-06-2016, 02:13 PM   #5 (permalink)
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Quote:
Originally Posted by flashgordon View Post
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:




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Old 11-09-2016, 10:56 AM   #6 (permalink)
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Old 11-09-2016, 01:10 PM   #7 (permalink)
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Quote:
Originally Posted by ihiryu View Post
....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?
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Old 11-09-2016, 05:54 PM   #8 (permalink)
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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?
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Old 11-10-2016, 05:19 AM   #9 (permalink)
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Quote:
Originally Posted by ihiryu View Post
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....
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Old 11-10-2016, 11:32 AM   #10 (permalink)
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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.
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