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The resistor (or Turbo smart module) changes the signal sent to the ECU to trick it into thinking the incoming air temp is hotter which must be above the threshold for the EGR valve to open. So while thinking the air is hotter and less dense, it allows more air/oxygen to enter the combustion process which in effect lowers the outgoing exhaust gas temps. That is how you're able to fully blank the EGR without getting an error code (or overboost) as the ECU continues to operate within OEM specs.
Out of curiosity, I wonder what the threshold temp for the EGR is...
Last edited by pollenface; 16th December 2020 at 12:18 AM.
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