Product Review
Dynojet Power Commander III
Do you need a fuel injection controller?
The Polaris RZR has a fuel injection system which
helps ensure that the engine’s 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 UTV 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 UTV 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 UTV like the Polaris RZR
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 UTV, 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 RZR’s 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
bike’s 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.
Installation:
The Power Commander III installation is very simple for the
Polaris RZR. It takes about 1/2 hour and installs in-line with no
cutting or splicing of wires.
-
Remove seats.
-
Remove the plastic panel behind the seats.
-
Locate the injector harness connectors and unplug them. The
connectors are located next to the ignition coils.
-
Connect the Power Commander III in-line of the stock wiring
harness and the injector harness.
-
Locate the stock Throttle Position Sensor (TPS) connector.
The connector is located near the rear of the air filter canister. The TPS
can be reached with the bed on or off, but it is much easier to get with the
bed off as shown. The TPS is the grey3 pin connector.
-
Unplug the TPS connector.
-
Plug the connectors from the Power Commander III in-line of
the stock TPS connector and wiring harness.
-
Use one of the supplied zip ties to secure connector in
place.
-
Remove the that holds the coil pack to the bracket.
-
Reinstall the bolt thru the ground wire of the Power
Commander III and then to the bracket.
-
Install the Power Commander III to the panel behind the
driver's seat just above the ECU. Use supplied alcohol swab to clean both
surfaces before attached velcro.
-
Use one of the supplied zip ties to secure Power Commander
III wire harness to frame.
-
Reinstall plastic panel and seats.
Maps:
The Power Commander is supplied with a base map stored
in the microprocessor. Additional maps are available via download on www.powercommander.com
for different
pipes and intake configurations. Maps can be shared and tweaked easily over the
internet and downloaded to the Power Commander.
Power Commander III - Polaris RZR Maps - Direct link to maps.
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.
Maps can also be manipulated, stored and downloaded using the optional Power
Commander LCD Unit.
The Power Commander III LCD Unit can be hooked up temporarily or mounted on the
bike for real time data viewing.
The Power Commander LCD Unit lets you store and download maps to the PCIII.
Contact Info:
Dynojet Research, Inc.
2191 Mendenhall Drive
North Las Vegas, NV 89081
800-992-4993
Website: www.dynojet.com or www.powercommander.com
| 
