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Old 02-21-2014, 11:12 AM   #1
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WOT A/F

Also on my tuner you can adjust it duh, what will it do running 2%,4% richer
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Old 02-21-2014, 11:50 AM   #2
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Generally you don't want to knowingly run an engine either lean or rich. Using higher octane fuels will give some leeway as far as mixture goes.

Running lean is a bad idea because fuel helps to lube and cool your internals as it passes along on its way to combustion. Running lean can cause excessive wear on the engine.

Running rich is a bad idea because it will make your engine run sluggishly and will leave carbon build-up on your internals.

The a/f mix that the tune gives (or your stock tune for that matter) is probably best.
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Old 02-21-2014, 12:21 PM   #3
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Lean condition and a lot of timing (advanced) can result in holes on top of your pistons.
Making the mixture richer will probably give you a little less power and definitely lower your MPG's.
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Old 02-21-2014, 02:16 PM   #4
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Just wondering since they give the option to change it
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Old 02-21-2014, 03:18 PM   #5
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Do not mess about with fueling until:

1. You have a wideband O2 system;

2. You know a lot more about tuning engines;

Point 2. can be corrected by buying Greg Banish's book Engine Management: Advanced Tuning and reading it 2 or 3 times.

Also the stock tune runs pig rich at WOT to begin with, especially on the '02 to '04 GTs with the pink 21 lb/h injectors. I have seen some running 11.0:1 or richer at higher loads and WOT. Most tuners pull 0.5 to 1.0 "AFR" from the Stabilised Open Loop Fuel table in the higher load and rpm cells...
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