Tuning with the engine in closed loop allows one to adjust the VE based on NBO2 feedback. We use the BLM and INT to scale VE so the O2 tweak is as close to zero as possible. This is good for warm, moderate driving conditions but does nothing for adjusting the open loop and transient conditions. Cold start, acceleration enrichment, power enrichment, and deceleration enleanment are part of the driving experience and if these are not tuned well enough the vehicle is no fun to drive. A heated wide band can provide feedback in a wider range of operating conditions. Logging WB readings allows one to drive the vehicle under conditions where the engine is misbehaving then evaluate the best path to correct the issues.
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