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Old 09-17-2014, 07:10 PM   #1
gutterball
 
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Air/Fuel Ratio

O.K. what should the Air/fuel ratio be?? I was thinking about adding a air/Fuel meter to my car, It seems most of the guys (me included) are running just under 13. but when I researched the meter, they state that 14.7 is normal. anything below is rich and anything above is lean. So are most of us running rich??
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Old 09-17-2014, 08:12 PM   #2
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14.7 is stoich for 100% gas, 14.1 is stoich for 10% ethanol gas. You should be running that under normal conditions. At WOT you want your AFR to be 12-13 for safe power. Anything higher than 13 you risk detonation and pre-ignition. Lower than 11 will rob power since the flame is too slow.
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Old 09-17-2014, 08:14 PM   #3
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14.7 is the stoichiometric mixture for air to fuel. it's what the perfect mixture is. but that will change with the application (I.e supercharged)

my car idles at 14.7 currently but when I accelerate hard it'll drop into the 13s and sometimes 12s for a brief moment. from what I've been reading should be around the 11-12 for force induction depending on application

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Old 09-17-2014, 09:20 PM   #4
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Remember, 14.7 AFR is "stoich" for perfect balance of economy and power. 12.6 AFR is maximum power. 15.4 AFR is maximum economy.
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Old 09-17-2014, 09:39 PM   #5
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Tnx for the explanation.
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