Quote:
Originally Posted by blue62
Another thing that people fail to consider when using common OBDII readers is the refresh or sample rate of the reader. Durametric, Foxwell, (I have both) whatever. I don't think the sample rate is all that fast.
For example when looking at O2 sensor signals on the Durametric the sample rate (across the bottom of the graph) is in frames over time. Frames per minute IIRC.
A Pico or a good Snapon scanner like a Versus the sample rate is in milliseconds.
So I think the slower sample rate of the common OBDII reader has an affect on the info they display.
Also the more sampling you are trying to do the slower the sample rate becomes.
Your going to get a faster sample rate looking at one 02 sensor signal then you are when looking at all four.
If your looking at cam angle on both banks, Cam deviation, RPM,
Your going to get a much slower sampling or refresh rate then you would get when just looking at RPM alone.
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I don`t know, he was revving up the engine quite slowly, definitely in the second range...