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Hey Steve I read back through our posts and may have missed it, but how or is there a way I could check the commanded afr and the measured afr. Can I check with the OFT? Im assuming the commanded on the e70-75 tune would be somewhere between 10.6 - 10.41 based on my calculations. Going back to your example of e50 in a car which made sense to me except for the rich part. If the commanded afr on the tune is 10.6 - 10.41 then shouldn't the e50 in the tank make the car have a lean exhaust since it has an afr of 11.8? The ecu would have to compensate and add fuel to achieve the e70-75 afr ("go rich command") which would in turn show positive fuel trims.
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