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Running too lean?

Originally Posted by G37Sam Would your UpRev e-tune work on my Gulf Spec car? Do you, or someone you know, happen to have a Cipher cable? I need your ECU

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Old 12-10-2009, 09:25 PM   #1 (permalink)
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Originally Posted by G37Sam View Post
Would your UpRev e-tune work on my Gulf Spec car?
Do you, or someone you know, happen to have a Cipher cable? I need your ECU ROM number to determine if I can flash it for you.
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Old 12-26-2009, 06:45 PM   #2 (permalink)
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Do you, or someone you know, happen to have a Cipher cable? I need your ECU ROM number to determine if I can flash it for you.
Not that I know off, but I am going on a dyno when my headers come in for sure.

What's the most accurate way to measure A/F numbers? Would using sniffers in the tailpipe be enough?
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Old 12-26-2009, 07:51 PM   #3 (permalink)
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Not that I know off, but I am going on a dyno when my headers come in for sure.

What's the most accurate way to measure A/F numbers? Would using sniffers in the tailpipe be enough?
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.
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Old 12-26-2009, 07:54 PM   #4 (permalink)
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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.
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Old 12-26-2009, 11:15 PM   #5 (permalink)
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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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Old 12-27-2009, 03:46 PM   #6 (permalink)
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Originally Posted by G37Sam View Post
Not that I know off, but I am going on a dyno when my headers come in for sure.

What's the most accurate way to measure A/F numbers? Would using sniffers in the tailpipe be enough?
Most accurate method is a direct AF sensor plumbed into the exhaust stream before any cats.

Tailpipe sniffers vary in accuracy, based on the method and dyno, but the good ones are fairly accurate, and certainly accurate enough to determine if you are running dangerously lean.
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