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Hi, when doing MAF or VVE rescaling, do I need to disable STFT,LTFT and DFCO, just leave open loop enable ?my car is Caddilac atsl.

Hello yes you will need to do this

Hi Huang, I'd suggest you watch the relevant worked example in the Practical Reflash Tuning course as it shows you step by step what you need to do. You can find it here - https://www.hpacademy.com/dashboard/courses/practical-reflash-tuning/hp-tuners-holden-hsv-r8-chevy-ss-maf-rescale-vve-calibration-introduction