Holley COMMANDER 950 - Manual (Page 22)

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NOTE: There is a vacuum line going to the fuel pressure regulator. This is needed to compensate for vacuum
present in the intake manifold. Make sure you always use this vacuum line. When the engine is running and
the vacuum line is hooked to the regulator, the pressure seen on the fuel pressure gauge will be lower
depending on how much vacuum is present. 2 inches (Hg) of engine vacuum will lower the fuel pressure 1
psi. For example, 15 inches (Hg) of engine vacuum will lower the fuel pressure about 7 psi. This is normal.
If the pressure is not checked and set, you will possibly have problems later when tuning the engine. There are going
to be instances when you will need to increase or decrease the pressure if your injector size is not adequate for your
engine. That will be discussed later.
At this time check for fuel leaks. After the engine is started you will then need to re-check for leaks.
5.
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IGNITION CHECK
It is very important that you are sure that you installed the distributor so that the timing will be close when the engine
is first started. If it is not, the vehicle may not start or run very poorly. If you are not sure, review the hardware
installation manual for proper distributor installation.
6.
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IDLE SETTINGS
The throttle blades need to be open enough so that an adequate amount of air can enter the engine, which will allow
the engine to idle. If they are too far closed, not enough air will be available and it is possible that the engine will not
start. The bigger the engine, the more air it will need at idle. Make sure that throttle plates are cracked open. It is
better that they are open too far than not far enough. If they are open too far, the engine will just idle too high. If this
happens close them far enough until the idle air control motor takes control of the idle.
7.
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LOAD BASE MAP
Next we will load the base map (base map refers to a complete EFI program) that is closest to your engine and
vehicle combination. This base map should allow for the vehicle to start and possibly drive but will always
need tuning for optimum performance. Perform the following steps:
A) Turn on the computer and start the Commander 950 software.
NOTE: Section 6.3 reviews how to open, send, retrieve, and modify data. The steps listed must be followed
or you will corrupt data in the ECU.
B) You should have received software with four 3.5” disks. One of these should be labeled “Commander 950 Base
Maps”. Insert the base map disk in the “A” drive. Select “File” and “Open Data from Disk”. Then select the “a” drive
under “Drives”.
C) Mouse click on the base map that most closely fits your application and mouse click on the “Ok” button. See the
included sheet that has descriptions of the base maps.
D) Making sure the ignition key is on, and making sure you don’t enter any of the screens in the software until you send
the ECU data, select “File” and “Send ECU Data”. It will take about one minute to send the map. When it is finished
sending, the mouse pointer should change back from the hourglass.
E) Your base map is now loaded.
8.
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SELECT ENGINE PARAMETERS
You now need to go in and verify several parameters for your particular combination that must be correct for the
engine to start after the base map has been sent. The parameters are located under “Hdwr Settings” and then “Engine
Parameters”. Go to this location. All changes MUST be done with the key on or they will not be changed in the
ECU. Any changes in “Engine Parameters” must be done with the engine NOT running but with the key ON. The
following items MUST be correct for the engine to start, if they are not choose the proper selection at this time. (See
Figure 5).
NOTE: When entering a numerical value, click the mouse on the cell you want to enter. This should highlight it in blue.
Then type in the number. Then hit the “Enter” key or the “Tab” key and this will send the value to the ECU.