Mindcrime13
08-24-2008, 08:36 PM
i read this on other forums,
well you can fool the computer temporarily, and while in open loop (warming up) the first time. but once its in closed loop the computer looks at the oxygen in the exhaust, from there it determines the fuel ratio, if it is not what the computer wants it will increase or decrease the fuel trim to obtain that ratio. so once you tweak the signal from the maf the ecu will think there is less air, cut some gas, but then, probably within 5 seconds, it will see the mixture is now lean, and will start increasing the fuel trim to return to its desired ratio.
by the way the ratio the computer is aiming for is the most efficient for the engine to run, yeah it might be a hint on the rich side, but that is because lean = high combustion temperatures, and that just equals problems, including melted pistons in extreme cases.
is this true?
well you can fool the computer temporarily, and while in open loop (warming up) the first time. but once its in closed loop the computer looks at the oxygen in the exhaust, from there it determines the fuel ratio, if it is not what the computer wants it will increase or decrease the fuel trim to obtain that ratio. so once you tweak the signal from the maf the ecu will think there is less air, cut some gas, but then, probably within 5 seconds, it will see the mixture is now lean, and will start increasing the fuel trim to return to its desired ratio.
by the way the ratio the computer is aiming for is the most efficient for the engine to run, yeah it might be a hint on the rich side, but that is because lean = high combustion temperatures, and that just equals problems, including melted pistons in extreme cases.
is this true?