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Posted by Wingerr (more from Wingerr) on Wed, 25 Jan 2006 18:43:11
In Reply to: Guarantee To Pass (Emissions), yaofeng, Wed, 25 Jan 2006 11:55:09
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Do you normally fill it up with premium, or was that another change you made to the mix?
Premium should reduce combustion temperature under the same conditions, and that would bring down the NO output too. If the ambient temperature is lower, that would help also, keeping the engine temp down; pick a frosty day to go in- :)
There's strange balancing act between CO and NO output; the rhodium in the catalytic uses the carbon monoxide to reduce the NO gas to CO2 and N2, so if it doesn't get enough due to lean running, aggravated by the high combustion temps causing more NO to be put out, then the NOx peaks-
posted by 69.117.20...
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