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Does a cutout mess with a/f readings on a dyno?


Buck531

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First assumption is that you are not bypassing the Catalytic Converter with a cutout, they have been removed?

 

You will have different A/F readings. The degree of difference will dictate the want/need for the tune.

 

Cutouts increase exhaust flow which reduces backpressure. Backpressure forces exhaust gases back into the combustion chamber and contaminates the next burn cycle. Reduced backpressure increases exhaust scavenging from the combustion chamber giving you a cleaner, more efficient burn. The increased momentum of the exhaust pulls more air/fuel into the cylinders, thusly changing both the temperature and air/fuel/scavenge mix.

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