Another S/C'd member worried about his AFR - Toyota Yaris Forums

03-24-2009, 12:38 AM	#11
CASTREX Who said Yaris was slow? View User's Garage Drives: Yaris T-Sport 2008 Join Date: Nov 2006 Location: Costa Rica Posts: 1,287	Your logic is right... the higher the number the leanest, However your point of reference is wrong... 14,7:1 would be the perfect number at idle or when crusing, not under boost. Under boos you need to run much richer than that to be on the safe side... Ideally these guys should be around 12:1 under boost... that is why they say a 13.5 or a 14 is dangerously lean...

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