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The data of concern is the BEN number itself. The shown map shows a scan from a nearly finished tune. The BEN numbers hover around 99 percent--which means the engine is receiving around 1 percent more fuel than commanded. We target to stay on the lesser side (richer) of 100 percent, rather than on the lean side of over 100. Initial maps (prior to any tuning) may be off by over 20 percent, depending how radical the needs and how far off the base tune is. View Related Article
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