General Category > Quadrajet Carb Talk and Tips

Secondary tuning

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Cliff Ruggles:
I tune for best results first, then take a gander at the gauge to see where I'm at.  With a well thought out engine combo it will typically be fine in the 14-17 A/F range at light engine load, depending on speed, RPM and throttle position.

At WOT I tune for best ET and MPH at the track.  Efficient engines are fine in the low to mid-13's and also keep in mind that the readings are really arbitrary and vary some depending on how far from the exhaust valve they are mounted and how quickly the exhaust system gives up heat.  With headers, for example, the closer to the cylinder head the better for the sensor......

Decades of experience have taught me to use the A/F gauge for reference, and to monitor changes more than a target for best engine performance in all areas....FWIW....

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