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"It doesn't. But most people don't understand the difference between traditional combustion and efficient combustion. When you increase combustion efficiency, your exhaust oxygen percentage WILL rise and you will NOT lose power or have high exhaust temperatures. I know it sounds hard to believe, but this is exactly what you need to learn to duplicate what I've done for years."
Perfect combustion will result in water and carbon dioxide out of the exhaust pipe which would be 0% oxygen so efficient combustion would be a lower percentage. you cant have more power and less heat
"The EFIE allows people who don't have your equipment to simply and easily 'correct' the oxygen sensor signal so that the CPU doesn't know that there is extra oxygen in the exhaust."
Extra oxygen in the exhaust means there was not enough fuel to burn all of the oxygen, an engine is an air pump that adds fuel. There can only be to much/little fuel
"The EFIE will never cause a mixture so lean that the engine detonates. The worst that will happen is that the CPU goes into limp mode (open loop) if it 'thinks' the fuel mixture is too lean. The EFIE is not intended to lean a mixture (although I understand that people try). The EFIE is designed to correct for a change in the exhaust oxygen that is caused by combustion enhancement technology."
open loop is when your engine has not reached operating temperature or near/at WOT limp mode is activated when multiple sensors don't agree like accelerator pedal sensors and TPMS. the pcm will be fooled but the effect would be hotter running engine which the engine coolant temp sensor would then back off pulse width of the fuel injector (lean out) an already lean a/f
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