Why is a wideband O2 sensor recommended for tuning instead of relying on the stock narrow-band sensors?
- Narrowband sensors only read accurately right at stoichiometric (about 14.7:1 on pump gas). Richer or leaner than that, they're effectively useless for tuning.
- Wide-open throttle runs well rich of stoichiometric, so a narrowband can't tell you how rich the engine actually is under power enrichment.
- To calibrate across the whole operating range, you need a wideband. Wideband feedback is essential for cammed and forced-induction combinations.
- For remote HP Tuners tuning, wideband data should come in through the Pro interface or a CAN wideband, not a generic 0–5 V input.
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