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Old 10-31-2002, 10:40 AM   #1
Diz
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Question Coupla Delta Dash questions

DD users -

What values for the 'knock' readings are indicitive of a knock event?

Also, is the 'Rear O2 Sensor' voltage reading the one I can plug into the equation: v * 14.7 = A/F ratio ?

TIA

PS - Yep, I did do a search & mail EcuTek already.
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Old 10-31-2002, 11:20 AM   #2
Mulder
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The rear 02 sensor is after the cats and is used only to measure catalyst efficiency, it does not indicate A/F ratio.
The front sensor is a wideband unit and does not read in voltage like the rear or a conventional 02 sensor. The parameters for it are current and resistance, and the DD also shows A/F correction and learning data. There is no direct reading for A/F ratio and I don't know if there is a simple way to calculate it based on the readings.
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Old 10-31-2002, 12:49 PM   #3
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The rear 02 sensor is after the cats and is used only to measure catalyst efficiency, it does not indicate A/F ratio.

Rats. I was afraid of that. Thanks for the input.
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Old 10-31-2002, 03:01 PM   #4
Jon [in CT]
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The DeltaDash parameter "Air/Fuel Sensor #1" is reported in terms of "lambda" (λ), which is defined as actual air/fuel ratio divided by the fuel's stoichiometric air/fuel ratio. The limits on the lambda values that the ECU reports are 0.76 (rich) and 1.72 (lean). When the actual lamda is outside that range, the limit value is reported. Assuming premium gasoline's stoichiometric A/F ratio is 14.5:1, 0.76 and 1.72 correspond to sensor A/F limits of approximately 11:1 and 25:1, respectively.

I'd ignore the DeltaDash "Knock Signal 1" parameter and focus, instead, on the "Knock Correction" parameter. Large positive values indicate the absence of detected knock.
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Old 10-31-2002, 05:11 PM   #5
Diz
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Excellent. That is EXACTLY what I was looking for. Thanks.

-paul
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Old 11-01-2002, 12:33 PM   #6
rlavalle
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So we can use the Delta Dash to read the WRX wideband O2 sensor instead of having to buy a separate wideband O2 sensor/interface/display for tuning?

That would be great!

Russ
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Old 11-05-2002, 09:15 PM   #7
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Quote:
Originally posted by Jon [in CT]
I'd ignore the DeltaDash "Knock Signal 1" parameter and focus, instead, on the "Knock Correction" parameter. Large positive values indicate the absence of detected knock.
Jon [in CT]:

What would a typical 'large' value's range be in Knock Correction? I am typically seeing values of +4.5 to +6 under boost.

TIA,
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Old 11-05-2002, 11:13 PM   #8
StephenDone
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Values of 4 and upwards generally indicate a happy state of tune and keeping a nice saftey cushion for conditions such as heat soak of the TMIC.
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Old 11-05-2002, 11:18 PM   #9
Jon [in CT]
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I have seen logs where knock correction was as high as +10.5 at 6800 RPM under WOT in 2nd. In retrospect, probably any positive knock correction should be viewed as "good."
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Old 11-05-2002, 11:50 PM   #10
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S.D. & Jon:

I was somewhat stuck trying to figure out the KC values. The D.D. software is proving to be a pretty nice tool as I learn to actually decipher the data.

Anyhow, thanks!
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