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I spliced some long wires into the signal wires, ran them threw a hole in the firewall, and to the DMM in my cup holder.
Anyway the planned test wasn't going to give any useful results, and there was far too much traffic. It seemed to only turns off over 35mph, but then I tried down shifting... My car seems quite quick to respond, under a sec to see change in the O2 reading from .335V(where it like to stabilize) to .450V.
The thing to determine is how much can we push the envelope on the lower RPM range past what the computer allows (engineers almost always give things some cushion room to prevent problems)
The thing that I learned from this test is that down shifting can really save fuel with some cars. It was cutting off even under 20mph if in 2nd.
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