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AFR goal 13b 4 port NA ?

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Old Jul 13, 2025 | 11:39 AM
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AFR goal 13b 4 port NA ?

Hi Guys, any input on AFR goals for my 13b 4 port NA, stock port, with electrinoc ignition and a edelbrock carb .

Idle, cruise and WOT ?

im running 0.75 % premix

thanks
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Old Jul 14, 2025 | 10:05 AM
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From: https://www2.mazda.com/en/100th/
idle, just tune it where it runs the best, start rich like 12.2:1 and see what it'll be happy at.
it depends on the idle speed, flywheel, port, etc. if you raise the idle speed a little, and its a stock (ish) port, low 13's is possible

Cruise ~14.5 is fine.

WOT; kind of depends. you want to start rich, lean it out until it runs the best, and then richen it up a tad.
you could start at like 12:1, and then peak power should be at like ~13:1, give or take
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