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Worthless unless its wideband, besides perfect stoichiometric ratio is 14.7:1, which is alot leaner then what a TT should be running at on boost, usually around 11.5 for pump fuel. Im betting your running too lean for a TT. Keep in mind lean for a TT is still rich on the stoich scale for A/F. For example, 13:1 is way lean for a TT, but is still on the rich side of a perfect stoichiometric ratio.
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