Quote:
Originally Posted by FB3
I have several concerns regarding these cat replacements. One, which has been mentioned, is the placement of the rear O2 sensor to fool the system.
The other, which I have also seen somewhere but have not seen any numbers, is what is the air fuel mixture with a stock ecm?
I am guessing that it will go pretty lean, especially with a cai system, and if the ecm cannot adequately adjust the mixture without a tune there is a real risk in valve and piston damage over the intermediate and long run.
Just my guess, but I would definitely have to see some dyno numbers before installing any high flow cats without a tune.
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The rear 02 sensor only monitors oxygen, and if the exhaust gases stay in the converter for a long enough amount of time, those gases burn off along with the oxygen. With our converters, the gases flow through so quickly that only those harmful gases burn off and more 02 flows through. The extender that we include takes that 02 sensor farther out of the stream so it doesn't read the higher amount of harmless 02 making it through the converter.
Regarding the A/F mixture, we have a phone call and an email in to our dyno shop requesting those numbers.