Buck531 Posted April 26, 2007 Report Share Posted April 26, 2007 Like stated above. Does having a cutout and putting the wide band (on a dyno) in the hole there different than putting it in the muffler (with the cutout closed)? Should it give different readings? Quote Link to comment Share on other sites More sharing options...
Rotarded1647545491 Posted April 26, 2007 Report Share Posted April 26, 2007 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. Quote Link to comment Share on other sites More sharing options...
Buck531 Posted April 26, 2007 Author Report Share Posted April 26, 2007 yeah, there's no cat on the car. I replaced it with a cutout. Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted April 29, 2007 Report Share Posted April 29, 2007 should be leaner closed up in the muffler (how much depends on how well the exhuast flows) and richer open Quote Link to comment Share on other sites More sharing options...
Buck531 Posted April 29, 2007 Author Report Share Posted April 29, 2007 well, the a/f stayed just about the same. a tad leaner. But it didn't jump off the page like it did 2 years ago. The FP back then WAS dying. Quote Link to comment Share on other sites More sharing options...
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