Running too lean?

G37Sam · 12-26-2009, 07:54 PM

Quote:

Originally Posted by FailsafePerf

IMO the most accurate way to measure a/f is from a wideband sensor in the test pipe or high flow cat. If putting them in the cat, make sure the sensor is ahead the actual catalyst.

Thing is, my FI test pipes have a J-shaped bung to fool the sensor in some way as to not trip the CEL, so that will require me doing custom work which I don't think would be worth it.. or would it?

Are sniffers completely off? Seen a few local Turbo Z's do it.

Chris@FsP · 12-26-2009, 11:15 PM

Quote:

Originally Posted by G37Sam

Thing is, my FI test pipes have a J-shaped bung to fool the sensor in some way as to not trip the CEL, so that will require me doing custom work which I don't think would be worth it.. or would it?

Are sniffers completely off? Seen a few local Turbo Z's do it.

From my experience, tailpipe sniffers seem to be fairly accurate at WOT, when gas velocities are the highest. Trying to tune idle/cruise/light load though, they tend to read a little lean.

I was doing some pulls on a Dynojet last month, and the tailpipe readout on the dyno's software consistently read about 1-1.5 points leaner than my Haltech widebands mounted in the downpipes.

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