Holley COMMANDER 950 - Manual (Page 63)

63
Hardware Settings (Hdwr Settings)
Figure 48 Engine Parameters
Engine Parameters – Base engine parameters that must be adjusted before the engine is started.
Number of cylinders - Select from 4, 6, or 8 cylinders. Only even-fire engines can be used. Most engines are even fire
except for some V6 engines.
Open or Closed Loop operation. See the EFI fundamentals Section 1.20 & 1.21 for important information on open and
closed loop.
When equipped with an oxygen sensor, the ECU can operate in closed loop operation if desired. In open loop operation, the
ECU looks up the desired fuel amount from the fuel cells based on the engine speed and load (the manifold pressure or TPS)
but does not use the oxygen sensor to trim the final amount of fuel. In closed loop operation, the ECU does the same task,
but then attempts to trim the final fuel amount based on the feedback from the oxygen sensor. If the exhaust oxygen sensor
indicates a lean condition, the amount of fuel is increased slightly. Conversely, if the sensor indicates a rich condition, the fuel
delivery is reduced slightly. Use of closed loop operation will compensate for engine wear, altitude changes, etc.
Injection Style – The system can control either port fuel injection systems or a throttle body system. See the EFI
Fundamentals Section 1.0 on descriptions of both.
Ignition Type – The system must know what type of ignition signal to look for and whether to generate spark timing signals or
not. See Appendix 10 for more specifics on ignition systems and wiring. The following chart overviews which ignition type to
select for different ignitions. See Appendix 10 for wiring schematics.
Fuel Only (coil -) – Use when computer controlled timing is not desired. Can NOT be used with a capacitive
discharge ignition system such and the Holley Annihilator systems or MSD systems. Damage to the ECU will result.
If a non-computer controlled HEI is used, this is the proper selection.