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UTV Blog

How to Install an HMF Fuel Controller

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The first step when installing the Optimizer is connect it to a good ground source. This can be a good part of the chassis or the negative battery terminmal. Failure to do so can result in damage to the Optimizer.

1. Locate the Fuel Injector on the Throttle Body, which is between the Cylinder Head and Air Intake.

2. Unplug the OEM Connector from the Fuel Injector.

3. Connect the Female Optimizer Connector to the Fuel Injector.

4. Connect the Male Optimizer Connector to the OEM Fuel Injection Wire Harness.

5. Repeat for all injectors.

6. Mount the Optimizer in a safe area where you have easy access to it for on site tuning.

7. Run the HMF Optimizer wires so they’re clear of any moving or hot parts.
(i.e. exhaust system, head pipe, s-bend, oil lines, hydraulic lines, etc.)

Tuning The Optimizer

It's an often misconception that a fuel injected engine will automatically tune itself when an after market part is added. This is actually not the case. When adding an after market part that directly effects the engine, retuning or remapping will be required.

What Does the Optimizer Do?

The HMF Optimizer will change the signal to the fuel injector to compensate for added aftermarket parts. It is a piggy-back fuel controller that plugs directly into the vehicle wiring harness and stays connected so long as it is needed. It's small, water-resistant, and mounts just about anywhere.

What it can do is compensate (to a certain point) for changes in air density such as temperature, humidity, and elevation. Since the computer cannot see intake air volume, or monitor oxygen content in the exhaust, it does not know additional fuel is needed. That's where the HMF Optimizer wil ltake over.

What does it mean when 1 and 8 are flashing green and red?
No fuel is being added over the stock fuel map. It is common to see this key on, engine off, and during off throttle deceleration.

Is each Optimizer different?

Yes. Each and every Optimizer has a different map that's been programmed for that specific machine with our HMF exhaust systems. After we have completed exhaust development on a new machine, we dyno for horsepower testing and fuel tuning. Air to Fuel ratio (AFR) is measured by a wide band Oxygen sensor placed in the head pipe of the exhaust. If the AFR is rich (too much fuel) or lean (not enough fuel) we use the Optimizer tuning software to build a custom fuel map that meets the needs of the particular model that we are working with. The software lets us add fuel based on RPM, load or, a ratio of both. When it is all said and done, we have an affordable fuel controller with a map created specifically for the vehicle we are working with. The problem is no two engines are the same, and most of the time you aren't going to stop with an exhaust.

Adding more parts and modifications.

You will likely add a free flowing air filter, maybe a cam or headwork etc. All of these will change fuel demand. That's why we leave you, the master tuner, with the ability to make tweaks to the fuel map. The best way to be sure your Optimizer is set perfect for your individual machine is with a wide band oxygen sensor. If you do not have access, or are not familiar with this equipment, it is best to take your machine to an experienced tuner.

The Modes, the settings, the how-to.

There are 4 modes that will allow you to increase or decrease fuel percentage from the original fuel map.

Mode 1 - Green: This controls fuel delivery at lower throttle positions and RPM
Mode 2 - Yellow: This controls fuel delivery at mid range throttle input and RPM
Mode 3 - Red: This controls fuel delivery in higher throttle positions and RPM

There are two (in some cases three) more modes that are often misunderstood.

Mode 4 - Green and Blue typically will control the accelerator pump feature found on select models only.
Lower on the number scale will give you less fuel when you stab the throttle. Higher on the number scale will give you more fuel when you stab the throttle.

Mode 5 - Yellow and Blue typically controls the timing of your yellow mode.
Lower on the number scale in this mode will bring your yellow mode in sooner. Higher on the number scale will bring your yellow mode in later.

Mode 6 - Red and Blue typically controls the timing of your red mode.
Lower on the number scale in this mode will bring your red mode in sooner. Higher on the number scale will bring your red mode in later

Troubleshooting

If you encounter a drivability problem like a stumble, pop, or misfire, take a look at the Optimizer display when the problem occurs. If the lights are yellow when the problem occurs, try making an adjustment to the yellow mode and see if the problem goes away. If the lights are red when the problem occurs, try making an adjustment to the red mode and see if the problem goes away.

  • Make all mode adjustments with the engine idling.
  • To increase fuel for any of these modes push the plus button. (While in that particular mode) The L.E.D. lights will move to higher numbers.
  • To decrease fuel, push the minus button. The L.E.D. lights will move to lower numbers.

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