Contour Enthusiasts Group Archives Forums Modifications Duratec Performance The harsh truth about secondary removal

I have SE intake cams and 3 liter exhaust cams. The 3 liter exhaust cams had slightly more duration by my measurments with a degree wheel and lobe micrometer (it has another proper name, but I forget it at the moment). The point of me listing my "torque killers" was to point out my high tq number and that it was flat.

Without the secondaries in the car, you have three choices.

1) run a return spring so the ECU doesn't throw a code. Get the stock fuel and spark advance at ~3,500.

2) let the ECU throw a code, get the fuel and spark advance at ~2,500 because the ECU thinks the secondaries are stuck open and it doesn't want to run lean.

3) unplug the IMRC box, mis the spark and fuel advance as the ECU doesn't know what's going on with the secondaries at all. The ECU reverts to "stock" maps in the ECU.

A custom chip could be programmed to get the fuel/spark maps set up for running no secondaries properly without an MIL.

The 2001 3 liters have oval ports. That's what I'm going after...