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Old 03-21-2016, 06:24 PM   #50
anjuna
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Join Date: Sep 2014
Chapter/Region: TXIC
Location: Houston
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Quote:
Originally Posted by barbo2 View Post
Finally installed my Cobb intake this weekend along with the Cobb nonresinated downpipe. Running Cobbs V301 stage 2+ OTS map and currently have no issues. Haven't put my foot into yet, but have gotten zero knock and DAM is at 1.00. Air fuel rations look good, just runs a bit rich but thats to be expect on an OTS map.

Being new to this, what MAF Cor volt readings should I be looking for?
AFR will always look good out of boost. It's in closed loop, so it's hitting the target.

You won't see MAF V correction - that's not a thing.

You'll want to monitor your A/F Correction and Learning related parameters. These will show how much the ECU is changing the amount of fuel injected from what the tune is telling it, to what the actual amount of fuel is required.

The tune does it's calculations based off the MAF. The MAF says "hey, there's this much air coming in" and the ECU says "okay, let me look up how much fuel I should inject. Here we go!" and then the oxygen sensor comes back and says "hey bro, you're like, 9% lean" so the ECU says "well then I should add 9% fuel" and that's where your A/F correction comes from.

A/F learning is like a trust issue between the MAF and the ECU. It's getting tired of hearing that it's wrong from the oxygen sensor, so it learns to just ALWAYS add X percent (which is an average value over time). So then, it's just taking the MAF value, adding or subtracting the learned value, and then making closed loop corrections after that from the oxygen sensor.
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