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Originally Posted by mechman600
Awesome work! I wonder how hot is too hot, when IAT is too hot and starts creating adverse effects like retarded timing in reaction to pre-ignition. Just a question - I'm not suggesting that it actually will. And I am sure you will give us the answers soon enough.
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Thanks! This is a good point to consider. How hot is too hot? Nobody seems to know. I am not sure what the engine computer will do. I know that it does not have a knock sensor, though, so I will have to be careful.
Quote:
Originally Posted by mechman600
You are inspiring me to do the same. I would use a solenoid valve that I could control with a switch in the cabin. That way when I am mountain driving and encounter a massive hill, I switch it to "turbo mountain climb boost mode" to close the valve for a bit more jam.
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Be careful of that. With my old setup, it took several minutes for the intake air temperature to stabilize, when the coolant flow was turned off. I imagine that the new setup will take just as long.
Quote:
Originally Posted by mechman600
EDIT: As good as this modification may be for reduced fuel consumption, I wonder how good it also is for NOx production, which would be bad unless the catalytic converter is able to eat the difference. Increased IAT = increased combustion temps = increased NOx. Unless I am missing something, which I usually am.....
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Another good point. I've often thought of that, too.
I am reasonably sure that this will not affect NOx emissions too much. Under normal AFRs, the emissions system on my truck is such that it does both its normal job of oxidizing CO and hydrocarbons into CO2, and it also performs NOx reduction. I am not modifying or altering the AFR, as can be seen on my wideband O2 gauge. This suggest that NOx emissions will be catalyzed out as they would be normally.
However, the reason why I'm seeing such gains in the first place is because the truck engine wasn't really placed under any serious load while commuting. This HAI is effectively reducing the maximum power output of the truck engine, forcing the engine load to become higher as a percentage of its maximum loading. That's an argument that supports the idea that this mod will increase NOx emissions.
So, to be honest, I simply don't know.