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SVTPerformance's Chain of Restaurants
Tuning À la carte
Help me diagnose an unexplained AFR change
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<blockquote data-quote="cidsamuth" data-source="post: 16195274" data-attributes="member: 110091"><p>Not sure why the font is so hard to read on my post.</p><p></p><p>2008 Mustang GT with Stage 1 Kenne Bell, Kooks Headers, and high flow cats.</p><p></p><p>In November 2017, it was dyno tuned. Air/fuel was set at 11.7:1 at WOT. A few months later, I added an Innovate wideband ran to an Aeroforce gauge. It confirmed the 11.7 at WOT.</p><p></p><p>So, I didn’t pay attention for the last year. When I started looking again, I see it is now 11.1:1. This is consistent.</p><p></p><p>The only changes in the last year:</p><p></p><p>1. Changed plugs from Autolite gapped at .045 to Brisk at .035.</p><p></p><p>2. Added MSD plug coils.</p><p></p><p>3. T56 Magnum trans</p><p></p><p>4. Went from 3.55 to 4.10 gears.</p><p></p><p>5. Upgrades the HE and pump.</p><p></p><p>To diagnose, I took these actions:</p><p></p><p>1. Calibrated the wideband. No change to AFR.</p><p></p><p>2. Reinstalled the OEM coils. No change.</p><p></p><p>3. I pulled all eight plugs and confirmed the .035 gap. </p><p></p><p>All plugs looked great with no indications of a rich condition. The tailpipes are not sooty. Car continues to run great. If not for the change on the gauge, I wouldn’t even be thinking about this.</p><p></p><p>I guess the gauge could be off. I could adjust WOT AFR on the SCT handheld, but I’m hesitant in case it’s the just gauge inaccurate. </p><p></p><p>I’m afraid I will have to pay $500 for another tune to know for sure.</p></blockquote><p></p>
[QUOTE="cidsamuth, post: 16195274, member: 110091"] Not sure why the font is so hard to read on my post. 2008 Mustang GT with Stage 1 Kenne Bell, Kooks Headers, and high flow cats. In November 2017, it was dyno tuned. Air/fuel was set at 11.7:1 at WOT. A few months later, I added an Innovate wideband ran to an Aeroforce gauge. It confirmed the 11.7 at WOT. So, I didn’t pay attention for the last year. When I started looking again, I see it is now 11.1:1. This is consistent. The only changes in the last year: 1. Changed plugs from Autolite gapped at .045 to Brisk at .035. 2. Added MSD plug coils. 3. T56 Magnum trans 4. Went from 3.55 to 4.10 gears. 5. Upgrades the HE and pump. To diagnose, I took these actions: 1. Calibrated the wideband. No change to AFR. 2. Reinstalled the OEM coils. No change. 3. I pulled all eight plugs and confirmed the .035 gap. All plugs looked great with no indications of a rich condition. The tailpipes are not sooty. Car continues to run great. If not for the change on the gauge, I wouldn’t even be thinking about this. I guess the gauge could be off. I could adjust WOT AFR on the SCT handheld, but I’m hesitant in case it’s the just gauge inaccurate. I’m afraid I will have to pay $500 for another tune to know for sure. [/QUOTE]
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Tuning À la carte
Help me diagnose an unexplained AFR change
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