Quote:
Originally Posted by Zsteve
Not sure what the thickness of the piping has to do with anything at the MAF location. Its about the diameter of the piping, and that is how some intakes are making the gains they are, is that they make the MAF size a little bigger tricking the ECU on the actual amount of air coming in (more air coming in but the ECU thinks less is coming in cuz the larger pipe means less velocity, if I remember the explanation to me before about this) which then causes the ECU to adjust in a way to make more power.
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That's right. A larger pipe will have slower airflow than a smaller pipe at a given flow rate. Think of it like a garden hose: when the end is open, a large volume of water slowly pours out. Now you put your finger over it, and all of a sudden the water moves out much faster, but the amount of water coming out is pretty much the same. What you did was in effect make the hose act as if it were smaller.
This concept is important once you know how a maf sensor works. Basically, it's a wire that is heated to a target temperature by an applied voltage (aka "hotwire"). As faster air goes over the wire and cools it down, more voltage is applied to compensate. It is this voltage that the ecu uses to calculate the required amount of fuel.
In a nutshell, it's like this: larger pipe-->slower air-->less cooling of hotwire-->less MAF voltage from ECU-->less fuel injected-->leaner air/fuel mixture.
I think exhaust and HFC's alone have little effect on A/F ratios, as any additional airflow gained by these systems is still going to be metered by the MAF and more fuel will be injected accordingly.
Wow. Sorry, that was boring
