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Old March 13th, 2006, 07:43 AM
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brian bertolini
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tune resistors and cats

I was just at the rpi site and did some reading on tune resistors. If I'm not running cats, would having a tune resistor for cats cause any problems? Wouldn't it just run rich? Any body out there who has removed their cats changed out this part?
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Brian Bertolini
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Old March 13th, 2006, 12:03 PM
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Not too long ago somebody ran a series of tests on the various fuel maps that the tune resistors gets you. The fuel map for use with the cats does run very rich during acceleration , though they all run about the same when at a steady speed and the engine is warmed up. But simply removing the cats wouldn't cause the engine to run any different, as all measurements are taken before the cats anyways.

Though the exhaust will be extremely polluting in comparison to running with cats, I found this out due to the previous owner gutting the cats on my truck and passing inspection was just impossible without new ones.

-Hans
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Old March 13th, 2006, 10:29 PM
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Quote:
Originally Posted by Hans
Not too long ago somebody ran a series of tests on the various fuel maps that the tune resistors gets you. The fuel map for use with the cats does run very rich during acceleration , though they all run about the same when at a steady speed and the engine is warmed up. But simply removing the cats wouldn't cause the engine to run any different, as all measurements are taken before the cats anyways.

Though the exhaust will be extremely polluting in comparison to running with cats, I found this out due to the previous owner gutting the cats on my truck and passing inspection was just impossible without new ones.

-Hans

So I'm also guessing that you didn't notice any performance change once you added the cats?
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Old March 13th, 2006, 10:34 PM
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Nope, no difference other than passing emissions testing finally and no more hiding from the cops.

-Hans
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