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Old 10-08-2013, 05:50 PM
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ScaldedDog ScaldedDog is offline
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Join Date: Dec 2005
Location: Littleton, CO
Posts: 779
Default How does gearing affect emissions testing?

My 4Runner, that is driven a good bit less than ten miles per year in emissions controlled counties, is due next month. [scam] It passed last time, though it always seems to require the extended test, or whatever they call it, to do so. Since that test, I've regeared from 4.88 to 5.29, and 4.88 was too short for 33" tires. Is that likely to make a difference in its ability to pass, or will the tester just upshift to an appropriate gear? I don't know the test protocol well enough to predict what will happen, but I know they always seem to run it at a much higher RPM than would be required on the street to maintain the test speeds.

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