KASR_Z28
03-21-2003, 12:45 PM
At WOT, doesn't the injectors just go full spray anyways? Or do they not? Becuz if they do, then what advantage does spraying before the MAF really do?
BUT, if the sensor truly does tell the computer to push more fuel with the incoming air (even at WOT) then it makes it moot.
So is that to say, that even though we go WOT in NA applications, the computer isn't pumping max. gas thru the injectors????
Anyone else see my point?
KASR
Ed Blown Vert
03-21-2003, 12:59 PM
If you do not shoot N20 before the MAF when running dry, you will cause a lean condition because the computer does not know to add more fuel.
And no at WOT the injectors are not at 100% duty. It depends how much air is passing through the MAF.
KASR_Z28
03-21-2003, 01:00 PM
Originally posted by Ed
If you do not shoot N20 before the MAF when running dry, you will cause a lean condition because the computer does not know to add more fuel.
And no at WOT the injectors are not at 100% duty. It depends how much air is passing through the MAF.
yea, that's what i figured, but doesn't that seem odd that even though you throttling it ot wide open, it still doesn't go 100% duty? what's the reasoning behind that?
KASR
Ed Blown Vert
03-21-2003, 03:47 PM
Remember it is also dependant on how fast your engine is turning. The engine will ingest more air as rpm's increase.
Injuneer
03-22-2003, 12:42 AM
Originally posted by KASR_Z28
yea, that's what i figured, but doesn't that seem odd that even though you throttling it ot wide open, it still doesn't go 100% duty? what's the reasoning behind that?
KASR
Doesn't seem odd at all.....
You get optimum power and torque in an NA motor with an A/F ratio that is generally between 12.8-13.2:1. That means for every 13 pounds of air that enters the cylinders, the injectors need to add one pound of fuel. Since air flow varies with RPM (and volumetric efficiency), the fuel has to be limited to match the air flow. The MAF sensor tells the PCM the mass (pounds) of air that are entering the cylinders, the PCM has to adjust fuel flow accordingly. Just because you are at WOT doesn't mean your engine is using the max amount of air.