Holly HP EFI-- Idle & IAC Tuning

[Robin Lawrence]

Originally Posted by Glenn Briglio

Hey Robin is there any issue with using the primary pipe on header for O2 to ecm tuning during a run?

Not really any issue. Chevrolet Performance did just that during testing on the COPO's in 2013 and 2014. I believe they had worked on the cylinder to cylinder on the dyno so it was fairly well matched.

Using the Holley to perform closed loop in the primary allows you to enable closed loop at a lower RPM. The optimum A/F ratio will probably be slightly richer than in the collector. Optimum A/F is relative so it will need to be tested to determine the best for a particular combination.

Robin