Jet size affect afr AFR is a bit rich at around 12 to 13 and I could probably benefit from bigger account jets. The low speed air bleeds will have a good affect change off idle. About how much does one jet size on one bowl affect AFR? May 11, 2014 · So the larger the jet, the less an effect the size increase will have. These are the little brass orifices which can be seen looking down the top of the air horn. Thanks in advance! May 17, 2013 · There’s one more old drag racer rule of thumb to consider: for every 700- to 800-foot change in altitude, the jetting should be adjusted. Sep 15, 2015 · Remember to check your WOT if you change your primary jets, and your idle mixture screws. Dec 6, 2009 · I am running a stage 1 SC on my 2004 RX1 I am currently getting an AFR in the 10. 6. Here are my questions: How many jet sizes must you go up in order to drop the AF ratio a full point? (Looking for rough ballpark answers) Nov 5, 2007 · Ok, then the area of my #420 & #430 jets would be: 420: 138540. Holley also suggests decreasing one jet size for every 2,000 foot increase in altitude.
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