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PCM Calibration 

1996-99 SHO Questions

1. Are the secondaries programmed to switch state @ 6800 RPM?

Yes - This action provides better control of engine speed when limiting maximum RPM. Switching the secondaries (IMRC position) reduces engine power, thereby reducing the need for cylinder cutoff to control engine speed.

2. Is the timing on the SHO conservative for midwest driving conditions & premium fuel?

No - The SHO has been calibrated for optimum performance on Premium fuel. The knock sensor reduces spark advance automatically for high temperatures or poor quality fuel. Other spark compensation has been built into the calibration for extreme conditions.

3. Is there a timing retard while shifting?

Yes - The retarded timing reduces engine power during shifts, which enables quicker shifts with reduced wear on transmission components.

4. Are there performance gains to be had with the right table settings or software changes?

No - Optimum power was developed on dynomometer tests & validated on prototype vehicles. The knock sensor allows optimum spark under normal conditions, and retards spark as knock initiates.

5. Do you know anyone who does quality aftermarket chips for the EEC-V processor?

No - Customers have reported that some aftermarket chips cause excessive "spark knock". This could lead to engine damage under some conditions.

6. Are some EEC-V SHO ('96-'99) programs more aggressive than others?



Thomas F. Mausolf
Calibration Engineer
Taurus/Sable Vehicles




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