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Originally Posted by JustinP10
Does rotating the MAF so the sensor location changes in respect to the bend of the pipe affect anything?
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Originally Posted by Storm88000
No, I don't think so. Basically you want the MAF rotated because the air flows through the intake better.
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I have read posts that rotating the MAF 90 degrees from stock (hot wire on top) gives small gains in torque. It may be possible to slightly tweak your A/F ratio depending on MAF positioning along the intake tract AND its orientaion (hot wire up/down or right/left). What's best will depend on what you are trying to achieve and your intake--stock, not stock.
Air flow can differ in the area of the MAF, but more importantly, in the area of the hot wire within the MAF. The flow can differ in two ways. It can be turbulent or laminar (i.e., rougher or smoother, respectively), and it can also be slower or faster. Fast, laminar flow will result in the highest MAF voltage, and slow, turbulent flow, the lowest.
The factory fuel maps that a stock ECU uses will be based on readings from a factory intake and MAF positioning. A hypothetical situation: the stock MAF location/positoning may put the hot wire in an aera of slight turbulance and medium air speed as a result of the curves, bends, and surface irregularities of the intake tract and MAF body. The factory then programed the ECU with fuel maps based on MAF readings from that location.
If you were to rotate the MAF or somehow change its position so the hot wire was now located where the flow was more laminar (a.k.a. less turbulent) and or faster,
but the overall air flow to the engine stays the same, this would result in a richer A/F mixture because the MAF is reading more flow, but actual intake air flow remains the same--only the MAF reading location changed, not anything that would affect the overall intake flow.
So how do you position the MAF to, in theory anyway, change A/F ratios? Air (or water) speed is faster on the outside of a curve, thus greater flow. So if you want the leanest possible mixture and there is a curve in the intake tract ahead of the MAF, rotate the MAF so the hot wire is on the inside of that bend. For rich, go to the outside. Trying to figure areas of turbulance or laminar flow is much more difficult, but if this procedure can have any noticable effects, which, according to the posts I mentioned at the beginning, is entirely possible, than this is a simple enough procedure to try some different positioning and see if it helps or hurts.
L8R
