Stumble a 3k rpms (vag-com plots inside)
02-02-2004, 07:22 AM
#12
You're right.....I was thinking of the graph differently....
<img src="http://www.awe-tuning.com/media/dynosheets/graph_table.jpg">
Looks like your somewhere around 17.6:1 at the dip and 13:1/14:1 before/after it.
That's actually not that much a change and when you consider that at ~3000 RPM you be at maximum VE, so I think that voltage change due to the small movement in fuel is VERY possible. Usually fueling swings up a bit around 3000 RPM.
Looks like your somewhere around 17.6:1 at the dip and 13:1/14:1 before/after it.
That's actually not that much a change and when you consider that at ~3000 RPM you be at maximum VE, so I think that voltage change due to the small movement in fuel is VERY possible. Usually fueling swings up a bit around 3000 RPM.
02-02-2004, 10:35 AM
#13
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How did you figure out those A/F ratios?
The table you posted indicates, higher voltage leaner mixture. Am I missing something?
Is there an equasion to convert my voltage(v) readings to a A/F ratio?
Is there an equasion to convert my voltage(v) readings to a A/F ratio?
02-02-2004, 10:41 AM
#14
That's what I was thinking until I looked at the graph again.....
The table shows the lambda values...NOT the voltage.
You use the chart to convert the voltage to a lambda value. Then use the lambda value to look up your A/F ratio.
You use the chart to convert the voltage to a lambda value. Then use the lambda value to look up your A/F ratio.
02-02-2004, 12:12 PM
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Possible that is from misfires. You can get enough misfires at WOT in that max load range to make
the car stumble without setting a DTC. BTDT with Iridiums. It's possible the injector pulse width is being closed down due to over rich O2 readings when you misfire. Did you change the plugs over to the NGKs gapped ~.030" ?
02-02-2004, 01:27 PM
#20
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If memory serves it has to do with the Motronic communication not Vag Com's abilities. On the newer
ECUs they can get way more .. and get a faster sample rate to boot. You should really only log one block at a time or teh sample rate will be too low to be of real use.