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Old 01-11-2010, 10:29 PM   #5 (permalink)
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If you are doing open loop testing, neither will be absolutely accurate. In open loop, fuel is just being wasted to enable easy starting in cold weather, or its injecting extra fuel to cool down the combustion chamber due to ping/knock. You don't know how much extra is being injected. And, there is no easy way to calibrate either of them to get close unfortunately, unless you get on a dyno and do some serious testing.
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