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Thinking in terms of Cubic Feet per minute, we know that your engine uses hundreds.....(think about a 650 holley on a Chevy, that makes twice the HP) so, if you are flat down a straight for 20 seconds, you'll use a lot of air, LOL. A lot more than any box can house.
If you are doing experiments in this area, I imagine that the concept will be to get the speed of the air stabilized and smooth across the hot wire resistor.
My understanding of the genious of the hot wire design is that it automaticaly adjusts for all changes in the conditions. Basically a current is sent thru it, and the resistance is monitored. The computer seeks to maintain the temp of the wire. More air flowing over it, whether due to speed, incresed density due to temp, or incresed density due to barometric pressure will couse the computer to adjust. The adjustment is merely then translated into a fuel need.
In testing, I think the SIR, when placed in front of the MAF, presented a stream of very high velocity air/turbulence, that had not slowed and smoothed, to perhaps one section of the wire, and the wire was over cooled, so to speak, causing the computer to assume that it needed to add more fuel. Thats why we saw issues with black smoke, and CEL triggers relatively low in the rev range.
The safest thing to do is place the MAF upstream in clean flow, but I think that a closer study could yeild a different arrangement with the SIR upstream.
Again, I'm not an engineer, just reporting what I saw, and just trying to help. [/b]
Damn I think the CRB should tell us how thay want us to mount for it to be legal. With all this expermentation don't we deserve a little more time to make this damn thing work? Hell it's been 6 years, what another month or 2?