got my aem wideband a/f installed. got a ?
Veteran
Joined: Nov 2008
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From: edmonton, a.b
Ok I'll give it a shot.. Scientists and engineers that are paid way more than us came up with the stoich... Basically yes the perfect burn ratio is 14.7 pounds of air to 1 pound of fuel.. The ECM along with all the sensors- O2, IAT, map, maf etc... Will measure the amount of air and the amount of unburnt fuel in the exhaust to constantly try to even with the 14.7.1-1 ratio.
Now when u say get the 12 psi from the meter the computer is automatically changing the amount fuel that the injectors are shooting into the cyclinder. Hence why if u put a turbo or supercharger on- u need a computer or new fuel maps to keep the ratio as close to 14.7.1/1.
Now the 14.7 atmospheric pressure reading comes from a column of air 1 sq inch from sea level that reaches out to the I think the ozone layar. Now the weight of that air in that coloumn is 14.7 psi... So that's why the stoich works causes it's easy
easier to change the fuel trim instead of air pressure ...especially a naturally aspirated engine.. Hopefully this makes sense? Oh and sorry for any spelling mistakes I'm nMy cell phone right now
Now when u say get the 12 psi from the meter the computer is automatically changing the amount fuel that the injectors are shooting into the cyclinder. Hence why if u put a turbo or supercharger on- u need a computer or new fuel maps to keep the ratio as close to 14.7.1/1.
Now the 14.7 atmospheric pressure reading comes from a column of air 1 sq inch from sea level that reaches out to the I think the ozone layar. Now the weight of that air in that coloumn is 14.7 psi... So that's why the stoich works causes it's easy
easier to change the fuel trim instead of air pressure ...especially a naturally aspirated engine.. Hopefully this makes sense? Oh and sorry for any spelling mistakes I'm nMy cell phone right now
Veteran
Joined: Nov 2008
Posts: 480
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From: edmonton, a.b
yea sorry about that, i just read bad too and it was a little vague. btw, i think i just seen you and your truck on youtube. a Clay bar vid? ...and kung fu stuff haha. cool vids man
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Record Breaker
Joined: Apr 2008
Posts: 1,899
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From: ohio
i think i understand too. didnt think i would get that good of a description.lol
thanks for your guys help.
another thing i noticed is that when i floor it, and let off the throttle, the reading goes to like 18 for just a second. is that o.k.? and why is it doing that?
thanks for your guys help.
another thing i noticed is that when i floor it, and let off the throttle, the reading goes to like 18 for just a second. is that o.k.? and why is it doing that?
Veteran
Joined: Nov 2008
Posts: 480
Likes: 0
From: edmonton, a.b
yea thats fine.... when your at high rpm to lower the RPM back down it quickley it basically kills the fuel. then i believe something like the inertia or weight from the pistons keep it running until it gets to idle or your get back on the gas pedel!
so thats saying its almost all air, and a small amount of fuel to bring the RPM down smoothly
so thats saying its almost all air, and a small amount of fuel to bring the RPM down smoothly