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Holley Commander 950
Holley is probably one of the most well recognized names in the high-performance industry. They have long been the leader in performance parts for American V-8 engines, most notably their series of performance 4-barrel carburetors. Holley has always been on the forefront of fuel delivery, and their new Commander 950 engine management system is no exception!
The Commander 950 fuel-injection system is offered from the performance giant Holley Performance Products. While the company has been well known for its performance carburetors, they aim to prove that their quality lives on, and as times change, so will they!
Holley decided that in order to keep up with the demands of late-model hot-rod enthusiasts and the ever-increasing trends from manufacturers to use electronic engine controls, they would need to develop their own line of engine management systems. These systems would need to control not only fuel-injection duties, but also add the capability to control the factory ignition units.
To that end, Holley introduced the Commander 950 complete engine management system. This is a highly capable system aimed squarely at the domestic V-8 marketplace. Though the ECU can be used on any combination of 4-, 6-, or 8-cylinder engines, it is mostly found on the larger-displacement V-8 engines in unique hot rods.
The Commander 950 engine management computer system is capable of being used on any of 4-, 6-, or 8-cylinder engine. However, it is mostly found on large-displacement V-8 engines in unique hot rods. It typically fires two injectors at a time, like the ones shown here.
This unit is capable of driving up to 8 injectors of either low or high impedance in batch fire, or up to 4 injectors in a sequential fashion. It can also recognize any 1-, 2-, or 3-bar GM MAP sensor, and uses mainly all GM-type sensors and connections for easy placement into any domestic engine compartment. The unit can also be programmed by the user to sense engine load as a function of either MAP or TPS, but it cannot use blend both at the same time, like some of the other units we have talked about.
The Commander 950 ECU also has user programmable digital outputs for controlling things like cooling fans, air conditioning compressors, nitrous solenoids, and just about any other switched function that can be operated via a relay or solenoid!
This unit is capable of driving up to eight injectors of either low or high impedance in batch fire, or up to four injectors in a sequential fashion. It can also recognize any 1-, 2-, or 3-bar GM MAP sensor, and it can use almost all GM-style sensors and connections for easy placement into any domestic engine compartment!
All Holley Commander 950 units also have on-board data logging, which can aid the user in tuning and troubleshooting. With the use of the optional Race version of the calibration software, the user can set the parameters to be logged, as well as take advantage of some of the closed-loop control features the system has to offer.
The latest addition to the Holley line of product offerings is the wideband oxygen sensor option, which allows the user the ability to insert target air/fuel ratios in a map and then enable the closed-loop fuel control function to let the ECU make corrections to the base fuel map. This method helps novice tuners get up and running quickly and easily and helps advanced tuners create accurate calibrations by finding out information about how much correction is needed to the base fuel map.
The high-speed oxygen sensor and heater control unit used in the Holley system has been developed by FJO. FJO is a Canadian company that specializes in high-performance tuning equipment and its own line of engine management computers. FJO is widely recognized as a leader in the exhaust analyzer field.
The Commander 950 ECU also has user programmable digital outputs for using on things like the RPM-referenced shift light attached to left-hand side of this tachometer. The user tells the ECU when to turn on the light, so the driver knows when to change gears.
The base version of the calibration software comes ready to install and also offers many base maps for the user to select. These base maps are an easy starting point for all different types of engines, from naturally aspirated big-block Chevys to turbocharged 4-cylinders.
The Holley Commander 950 system can also be ordered with custom wire harness configurations to fit a variety of engines including most GM and Ford crate engines, including LS1, LT1, and ZZ4 Chevrolet configurations and Ford mustang 5.0-liter engines.
The standard version of the calibration software offers the tuner 16 ranges of engine load and 16 ranges of engine speed for a total of 256 possible points to program the fuel and ignition curves. In the Race version of the software, the user can define the breakpoint values between engine speed and load sites. This allows the user to have a fairly coarse calibration in areas where the change in volumetric efficiency is not very great over a corresponding change in engine speed. It also allows the user to make the calibration much more precise in areas where the volumetric efficiency changes rapidly, such as when an engine reaches its powerband.
The Race version of the software also allows the user to set target air/fuel ratio parameters and use feedback information from an oxygen sensor to correct errors in the base fuel calibration. This function allows novice tuners to get up and running quickly and lets racers compensate for changing environments without expensive and time-consuming retuning.
Be sure to inform your dealer when ordering the system about what type of engine you will be using, so that they can supply you with the correct type of wiring harness and sensor package.
Once you have received the unit, be sure to inspect the kit and account for all the items that were supposed to be shipped. If there is any problem with the shipment, contact your dealer immediately. Be sure to thoroughly read the owner’s manual and installation instructions before you being any part of the installation. It is also a good idea to begin practicing navigating your way through the calibration software a few days before actually starting the project.
The Holley Commander 950 system can be ordered with custom wire harnesses to fit a variety of engines including most GM and Ford crate engines. Chevy LS1’s, LT1’s, ZZ4’s, and Ford 5.0-liter engines are some of the most popular applications.
When you are ready to begin, start by finding a suitable location to mount the ECU. I prefer to keep them inside the vehicle in an effort to avoid any moisture or unnecessary heat from the engine compartment. Be sure to use a rubber grommet anywhere the wire harness passes through the firewall to avoid abrasion and possible failure of the harness. It is also a smart thing to try and keep the unit away from any source of electronic noise such as an ignition system to prevent any interference with the operation of the unit.
If you have ordered the correct harness for you installation, it should be an easy task to connect all of the fittings (which all come labeled for easy identification) to their respective sensors. If you have ordered a blank harness, be sure to make all of the crimp connections securely, or use some solder if wires must be joined together. Always protect any connections or bare wire from the outside elements to avoid corrosion.
Once the harness and ECU have been installed in the vehicle, you may download the software to your laptop and attempt to communicate with the ECU. If your engine configuration is close to any of the engines that Holley has provided start-up maps for, it is a good idea to use one and load it to the ECU now.
When you have established communication with the Commander 950, the first thing to check for is that all of the sensors in the live data screen are operating properly. Look for anything out of the ordinary such as a throttle position sensor reading backwards, or a faulty air or water temperature sensor reading.
Before cranking the engine, it is necessary to go into the set-up menu and ensure all of the settings are correct for your engine. Check to make sure that the number of cylinders matches and also that the correct MAP sensor is being used. You can also set up the type of injectors you are using and the type of ignition system you will have on the engine.
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| Table of Contents: |
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Table of Contents |
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Chap. 1 - Carburetors vs. Fuel Injection |
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Chap. 2 - The Basics of Electronics |
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Chap. 3 - Tools and Equipment |
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Chap. 4 - ECU Inputs |
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Chap. 5 - ECU Outputs |
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Chap. 6 - Tuning Maps and Basic Engine Calibration |
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Chap. 7 - ACCEL/DFI |
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Chap. 8 - AEM Plug & Play |
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Chap 9 - Autronic |
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Chap. 10 - Edelbrock Pro-Flo and Advanced Programmable Fuel-Injection Systems |
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Chap. 11 - EFI Technology |
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Chap. 12 - Eelectromotive |
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Chap. 13 - F.A.S.T |
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Chap. 14 - Haltech |
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Chap. 15 - Holley Commander 950 |
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Chap. 16 - MoTeC |
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Chap. 17 - Simple Digital Systems (SDS) |
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