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Early aftermarket EFI systems relied on narrow-band oxygen sensors that were only accurate at 14.7:1. Most new EFI systems now integrate wide-band oxygen sensor capability to allow tuning the air/fuel mixture across a much wider range, from 11:1 to 16:1 and leaner. The eMS-Pro EFI system, for example, uses Innovate Motorsports' wide-band oxygen sensor for accurate air/fuel ratio data. View Related Article
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