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so again, why wouldnt this be appropriate to calculate lets say 1/4 mile time? maybe not exact, but if its +- .5 sec, works for me
If +- .5 sec is accurate enough, go for it. Just keep polling the speed as fast as the hardware interface will take it. In the other thread someone mentioned using interpolation. That'll help too.
One remaining issue: distance
I'm not aware of any way to have the OBD-II interface read the odometer. The next best thing would involve keeping track of the time, as well as the speed, then calculate a distance estimate based on that.
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Is there any spec that helps to clarify the maximum possible values? Is this vendor dependent?
Here's a link a thread on the Scantool.net forum. They explain it better than I can.
http://www.scantool.net/forum/index....ay;threadid=25