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WB lambda sensor location on the primaries

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Running (2) AEM 4 channel UEGO, one sensor per primary.

We are placing the bungs on a dedicated engine dyno header set. N/A large displacement V8 with overlapping cam lobes. What is the recommendation on distance from head to sensor location? Talking to some folks at the aem booth at Sema, I recall the strategy had changed on placement 2-4 inches from the head due to the slight reverse on flow due to the cam overlap. Any suggestions?

Often with individual lambda sensors you're limited by physical space in the engine bay however on an engine dyno you're obviously more flexible. on our own engine dyno mule we have the sensors fitted approximately 6" from the header flange and this works well although we are running a factory engine with a stock cam with minimal overlap. I'm not convinced that the cam overlap is going to cause you much trouble, or to put it another way, I'm not sure if the sensor location is going to improve the situation with your overlap. With a decent cam with significant overlap, you're likely to find that your lambda reading is affected at idle even at the collector, hence I'd be doubtful that the location in the primary would have much impact.

What you will find however is that this only tends to be a problem at idle or very low airflow values. Once you're higher in the rpm and under load you'll see sensible and useable readings. Typically it's the high rpm WOT performance you'd be most interested in when using individual cylinder tuning.

Thank you very much for your input. We will design and install the bungs accordingly.

It is nice to have the extra space to place the sensors where is useful and convenient. In car can be very challenging. This is my current in project car Saab c900, but in this case there is a lot of space with the longitudinal engine arrangement.

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