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Placement of Lamda sensor

Understanding AFR

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Probably not the right place to have this put. I’m just wondering to know what would be the ideal distance to place the lambda sensor from the back of my turbo exhaust housing. I’m starting a new build and I am going using a 4.9 wide band. Any help appreciated thanks

As close as possible while keeping the EGTs the sensor is reading at or below ~900C for sustained periods and short bursts of ~1000C (this is from memory so i may be off slightly) so unfortunately, it will tend to vary if you're trying to be on the bleeding edge.