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Fuel trim large value

Practical Reflash Tuning

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In the hptuners worked exemple of chevy v8 maf/vve scaling during the road calibration video before making the WOT between minutes 10 and 11 we can see in the logger graphs a large positive fuel trim about 29% with an eq lamba measured of 0.75 can you explain why we have seen these numbers specialy after making all maf and vve scaling

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