Dynojet Ignition Module for Power Commander 3: What to Check Before You Buy
The Short Answer
Dynojet offered an ignition module as an add-on for certain Power Commander III (PCIII) applications, mainly the later USB generation. It lets you adjust ignition timing alongside the fuel map the PCIII already controls. It is not a universal accessory. It only works with your bike if Dynojet built a version for your exact make, model, year and market, and only if your PCIII can accept it. If either condition fails, the module will not help, however good its condition or price.
The PCIII line has been superseded by newer Power Commander generations, so most ignition modules for it now turn up used or as new-old-stock. That makes compatibility checks and condition checks more important than with a current product.
What the Ignition Module Does
A Power Commander III adjusts fuel delivery. It changes injector pulse width, the length of time each injector stays open, according to engine speed and throttle position. It does not change when the spark plug fires. The ignition module covers that side. It sits between the factory ignition signals and the stock ECU or ignition unit and adds or removes timing advance across the rev and throttle range.
Timing advance means firing the plug earlier in the compression stroke. Some engines respond to well-chosen advance with better throttle response or more power, especially after intake, exhaust or compression changes. Too much advance can cause detonation, uncontrolled combustion that damages pistons and other internal parts. Treat timing changes as a tuning job, not a plug-and-play upgrade.
The module is controlled through Dynojet's Power Commander software via the PCIII, so the fuel and timing maps are managed together. It does not replace or interact with the ignition switch, starter circuit or dashboard controls. It only modifies spark timing once the engine is running.
Compatibility Checks That Matter Most
Exact vehicle application: Ignition modules were built for specific bikes because ignition sensors, connectors and signal types differ between models. Match the module to your make, model, model year and market version, not just the model name. PCIII version: Ignition add-ons are generally associated with the PCIII USB generation. Older PCIII units may lack the expansion connection the module needs. Confirm the PCIII you own or plan to buy can accept it. Matching PCIII application: The PCIII itself must also be the correct unit for your bike. A correct ignition module paired with a PCIII from a different application will not work properly. Harness and connectors: The wiring harness should match your bike's ignition connectors without cutting or splicing. Missing or modified harnesses are a common problem with used units. Software access: You need software that can talk to the PCIII and load ignition maps. Older Power Commander software may need an older Windows environment or compatibility settings on a current computer, and a working USB cable. Map availability: Check whether timing maps exist for your engine configuration, or whether you will need a tuner to build one.
If a seller cannot say which bike the module was built for, treat that as a significant risk. Labels, part numbers on the housing and the connector shapes on the harness are the most practical ways to cross-check the application against Dynojet's own fitment information for your bike.
Buying Used or New-Old-Stock
Ask for clear photos of the module label, harness ends and connectors. Check for cut wires, taped splices, corroded pins or a cracked housing. Ask what bike it came off and whether it was working when removed. Confirm whether the sale includes the connecting cable to the PCIII and any original instructions. Ask whether a custom timing map is stored or available. A map built for someone else's engine setup may not suit yours. If you are buying a PCIII and ignition module together, confirm both are for the same application.
Weighing the Alternatives
The ignition module makes the most sense if you already run a PCIII on a supported bike and want to add timing control without replacing the whole system. If you are starting from scratch, it is worth comparing the cost and effort of assembling an older PCIII setup against newer options.
Option | When it fits | Main trade-off; PCIII plus ignition module | You already own a compatible PCIII and a matching module is available | Older hardware and software, limited support, used-market condition risk; Newer Power Commander with its own ignition add-on | Your bike is supported by a current generation | Higher outlay, but current software and wider tuning support; ECU reflash, where available for your bike | Your model has a reflash option for fuel and timing | Changes factory software directly; availability varies by model; Fuel-only tuning | Your modifications do not need timing changes | Simpler and lower risk, but no timing adjustment
Installation and Tuning Considerations
Fitting the hardware is usually a matter of routing the harness and plugging into the factory ignition connectors. Choosing the timing values is the hard part. The safest route is a tuner with a dynamometer who can watch power output and look for signs of detonation while adjusting the map. Fuel octane, compression ratio, air temperature and the condition of the engine all affect how much advance it can tolerate.
Before any tuning session, rule out basic faults so they are not mistaken for tuning problems. A battery with a low state of charge reduces cranking speed and can cause erratic electronic behavior. Loose or corroded connectors at the PCIII, the ignition module or the factory harness can cause misfires or no-start conditions. If the bike will not start after installation, first unplug the module and reconnect the factory ignition connectors. If the engine then runs normally, the problem is in the module, its harness or its map, not the bike.
Diagnostic Checks After Installation
Confirm the software detects both the PCIII and the ignition module. Verify the loaded timing map is the one intended for your engine setup. Start with a conservative map or zero timing change, then adjust from there. Listen for pinging or knocking under load, especially at low rpm with wide throttle. Watch for warning lights or fault codes that point to a sensor signal problem. Check that idle, cold starting and part-throttle behavior remain smooth.
Legal and Warranty Points in the US
Changing fuel and ignition calibration can affect emissions compliance. In the US, aftermarket engine-tuning devices are often sold for off-road or closed-course use unless they carry specific approval for street use, and California rules are stricter than federal ones. Check the labeling and your state's requirements before fitting the module to a street-registered bike. Engine tuning changes can also affect any remaining factory warranty coverage.
Next Step
Start by identifying your bike's exact model year and market version and the version of your Power Commander III. Then confirm that a Dynojet ignition module was built for that pairing and that the specific unit you are considering matches it. If those checks pass and you have access to a tuner, the module can add useful timing control. If they do not, a newer tuning system or a fuel-only approach is usually the more practical choice.