I have a 2011 Z06 with slightly higher than stock compression (12.0:1), but that higher compression required the timing to be retarded quite a bit. So, I'm installing an HFS-3 in the hopes that the timing can be advanced.
I've got everything installed except the fail safe signal. Since this is a naturally aspirated engine, my thought for the fail safe is to use the HFS-3 change over relay to essentially cut the IAT signal to the ECU. This should produce 0v to the PCM for the IAT signal, which the ECU correlates to 300+ degrees Fahrenheit. We could then adjust the ECU calibration such that the appropriate amount of timing is pulled for the high IAT reading.
To do this I was planning to cut the IAT signal wire (tan in color) coming from pin E of the MAF/IAT connector; then connect one segment to the white wire of the HFS-3 ECU cable and the other segment to the brown wire of the HFS-3 ECU cable.
Will this work as expected? Will the ECU receive the uninterrupted IAT signal while the engine cranks on start up?
