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#1
08-05-2025, 07:18 PM
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Power Valve question
Installed an Innovate data collection system for AFR vs. RPM and discovered the car is running lean.
Despite having an average AFR of 12.87 on a Mustang Dyno, at the track my AFR in 1st gear was approximately just over 13 on average, 2nd approximately 13.5 and 3rd gear roughly 14. Its a Holley 750 DP (4779-6) with 67/77 jets and a 5.5 Primary Side PV, none on Secondary side. Car has 14 inches of vacuum in Park, 12.5 inches at idle. I am planning on increasing the jet sizes by 2 or 3 on both Primary and Secondary side to improve the AFR across the run. Any reason to move the PV up (i.e. 6.5 for example) based on the old Holley rule of thumb or should the jet change be enough? Thanks for any thoughts DV |
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