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Originally Posted by krousdb
Or you could spend a few cents on a resistor. Or if you wanted the same adjustability, a couple of bucks for a potentiometer would do the trick.
Freeware is available that lets you see how a honda ECM works. For certain models you can look at the fuel and ignition tables as well as IAT and ECT compensation levels. On a 75F day, fooling the ECU into thinking that the AIT is 0F will result in 21% more fuel to be delivered. That could possibly produce more power.
The same goes for ECT. When the coolant temp is 170F, fooling the ECU into thinking that the ECT is 0F will result in 75% more fuel to be delivered under full throttle conditions. That could also possibly produce more power.
Now if you want to deliver less fuel, on a 75F day, making the ECU think that the AIT is 150F or higher will result in a 6% decrease in fuel delivery.
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This sounds like a way to fool the control systems into either a richer or leaner mixture setting.
I suspect the hybrid vehicle ECM would simply adjust the throttle until it had the energy output needed. Meanwhile, the mixiture would be either too rich or too lean and the results would be lower MPG and higher emissions . . . not something I'd recommend.
Personally, I like the electric super-charger approach better. The boost is modest so no intercooler is needed. It can be an 'on demand' case which lets us keep normal MPG. Best of all, the regular engine controls and systems work normally. The vehicle just acts as if the pressure altitude went down a couple of thousand feet. On the high plains, the car should be quite zippy.
Bob Wilson