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International Automotive Technicians Network
Re: Tuners and liability for emissions
Posted to Industry Issues Forum on 6/3/2019

I believe I remember a Subaru tune that actually made the mixture LEANER at WOT. The factory engineered in extra richness, under those conditions on the turbo engine, to allow a safety margin for pre-ignition and detonation.

The overly rich mixture, if I hav... Login to read more.