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Product Review

Dynojet Power Commander III

Dynojet Power Commander III

Do you need a fuel injection controller?

The KFX450R has a 32-bit digital fuel injection system which helps ensure that the engineís performance remains consistent and is virtually unaffected by changes in temperature or altitude. This system measures coolant temperature, air intake temperature, air intake pressure, engine speed and throttle position, then automatically delivers the ideal amount of fuel to optimize power delivery.

Why can't this high-tech system deal with adding a free flowing aftermarket pipe and/or intake? 

The simple answer is that unlike automotive applications, a fuel injected ATV does not have a mass air flow meter. Therefore, there is no way to measure the amount of air actually taken in by the engine. 

The long answer requires a bit more understanding of how a fuel injected ATV works. 

To run at the optimum level and achieve the highest power output, Dynojet has found that an air/fuel ratio (AFR) between 13.0 and 13.4 to 1 is best. A fuel injected ATV like the KFX450 uses a "map" that is built into the ECU to decide how much fuel to deliver at different points of the RPM curve. Various sensors on different systems allow the curve/map to be shifted up or down (richer or leaner) to compensate for altitude and air changes. These sensors do not really change the shape of the curve they just move it up and down a small amount.

Even if the fuel curve was perfect on a stock ATV, once you have altered the airflow through the engine (by changing the exhaust, intake, etc.) the table that the ECU uses to deliver the correct amount of fuel no longer matches the altered levels of airflow at different parts of the RPM range. One of the things to keep in mind is that not all modifications increase airflow throughout the RPM range. Often it is necessary to lean out certain areas of a fuel curve for peak output.

The best solution to this problem is to allow the user to add or subtract fuel at each 250 RPM increment and throttle position so that the new map matches the new airflow created by the addition of a pipe or intake.

Power Commander III:

The Power Commander is a fuel injection adjustment unit that plugs "inline" with the KFX450Rís stock ECU (electronic control unit). The PC uses original equipment style connectors, so no splicing or cutting of the harness is required. 

Changes are made to the bikes fuel via the Power Commander's onboard microprocessor. With this technology, the PCIII offers a large area of adjustment without making any permanent changes to the bikeís ECU. Removing the Power Commander returns the bike to its previous stock condition. Each unit comes complete with software and cable link that allows you to change between different maps or make adjustments to a map file.

The competition's unit can only be adjusted externally and only modifies the length or duration of the fuel signal at low, medium and high RPM. Fuel can only be added - there is no capability to lean the curve out.

The Power Commander can be adjusted externally for fuel delivery at low, medium and high RPMs. The Power Commander also utilizes fuel maps that adjust fuel delivery at every 250 RPM along the entire power curve.



Remove Seat. Remove 2 screws that hold the side covers to the fuel tank. Remove the 2 bolts (10mm) from the rear of the fuel tank.

Route the PCIII wire harness from the rear of the bike towards the throttle body. Be sure to route the loom under the cross member.

Unplug the stock wiring harness from the injector which is under the rear of the fuel tank.

Plug the PCIII wiring harness in-line of the stock wiring harness and injector. remove the bolt that secures the stock ground wire.  Attach the ground wire from the PCIII to this same location.

Locate the stock Throttle Position Sensor (TPS) connector.  It is on the left hand side of the bike on the left side of the throttle body.

We found the easiest way to unplug the TPS connector was to use a screw driver through the hole in the engine mount.  The clip is on the frame side of the connector and must be pushed in to release the connector.

This is the TPS connector after it has been removed.  The clip is on the frame side which is shown in the image above.


The Power Commander is supplied with a KFX450R base map stored in the microprocessor. Additional maps are available via download on for different pipes and intake configurations. Maps can be shared and tweaked easily over the internet and downloaded to the Power Commander. 

Using a computer, you can upload alternate maps or make changes to the existing map using the Control Center software and USB cable supplied with your Power Commander.

Power Commander LCD Unit
Maps can also be manipulated, stored and downloaded using the optional Power Commander LCD Unit.

Dynojet - Power Commander III and LCD Unit
The Power Commander III LCD Unit can be hooked up temporarily or mounted on the bike for real time data viewing.

Dynojet - Power Commander III LCD Unit - Maps stored on SD card   Dynojet - Power Commander III LCD Unit - Transfer map to PCIII
The Power Commander LCD Unit lets you store and download maps to the PCIII.

Power Commander III Maps for 2008 Kawasaki KFX450R


Coming Soon!

Contact Info:

Dynojet Research, Inc.
2191 Mendenhall Drive
North Las Vegas, NV 89081


Website: or

Dynojet Research

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