Quote:
Originally Posted by kern417
Target AFR for E85 should be lower, not higher. But since our cars are lambda based, the target will be the same. Usually I see targets 0.86-0.88 lambda on direct injection cars. That's 12.6-12.9 AFR on 93 or 8.4-8.6 AFR on E85. with E30 is somewhere in the middle, probably in the low 11s. But since our logs automatically convert to AFR, it shows 12.6-12.9 regardless of the fuel.
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I was referencing gas scale AFR not lambda. For 4G63T tuning for E85 it was found that gas scale AFR's around 0.5 higher (e.g. 12.0 vs 11.5) resulted in less knock and more torque. Personally I'm happier with the gas scale AFR of the MHD 95_102 map for an E30 blend.