Where do you take your AFR reading from?
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Joined: May 2001
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From: San Antonio, TEXAS!!!
Vehicle: 01 Tiburon Turbo, 99 Tiburon F2E, 2013 Avalon XLE Touring
Pre cat, but that's hard to do if you're doing it on a stock exhaust vehicle. It should be about 12-18" downstream from the head, or after turbo.
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Joined: Sep 2009
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From: Denver, CO
Vehicle: 2003/Hyundai/Tiburon
I think it depends on the sensitivity of the wideband meter your using. Most consumer wideband systems are 5 wire and are very sensitive to fluctuations caused by a cat so you would want them pre cat. A 7 wire sensor is more accurate and isn't as affected by a cat converter so it can be place post cat.