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Why Dynojet
Results to be expected?
Why use the rolling road?
Gas/Air Monitoring

Dyno Tuning UK
Power commander & Fuel injection

What is a Power Commander?

The Dynojet Power Commander is a very impressive plug in box that is simply installed between the bike's ECU (brain) and the injector bodies. As the continually changing signals from the ECU are sent to the injectors, the Power Commander increases or decreases the value of these signals dependant on how the Power Commander map has been set.

Dynojet Power Commanders generally get supplied with a base map installed, however as with humans, bikes also vary from individual bike to individual bike and it has been our experience that these base maps can often be unsatisfactory. We would highly recommend an individual map for each bike.

How and why is it manipulated ?

Click on image to enlarge

In order for us to be able to accurately manipulate the power commander map that controls how much or how little fuel is sent through the injector we must first be able to hold the bike at set RPM using any and all throttle positions. This is where the dyno 250 comes in. We are able to pre-set desired engine RPM's and the inertia brake on the dyno will hold the engine at this level, regardless of how far we open the throttle.
Whilst the dyno is holding the bike at this set level we are able to monitor the Gas/Air ratio using a wideband lambda sensor and then manipulate the figures in the Power Commander map until the Gas/Air ratio reaches the correct level for optimum fueling.
All of the figures that we enter into the map represent the percentage of fuel increase or decrease that we desire over the base signal that is emitted from the ECU.

This monitoring and manipulation procedure is repeated for all of the low throttle positions and low RPM areas, after which we move through the rest of the rev range of the bike using what is termed as "roll on" testing. This is a procedure where a roll on is performed at say 20% throttle, charted on a graph alongside the gas/air ratio for this roll on. We then manipulate the figures in the power commander and repeat this process at this throttle position until we are happy the we have reached the desired "Flat" fuel line that we are looking for.

Tuning Link
In a bid to speed up set up times and make the whole operation more efficient, Dynojet US have developed "Tuning Link" which is a software program that helps us progress through the above stage more quickly, and eventually we hope will allow for automated set-ups.
Although some dyno operators are happy to work with the final results given by Tuning link, we at Seastar use this simply as a base map to enable us to spend more time on the "fine tuning" that may be required.

All in all, our setup time is usually around the 4 hour mark, and provided that the fuel injected machine is not too far from standard production with regard to engine modifications we are able to offer "fixed rate" setups.

These fixed rates also vary dependant on whether or not we have supplied and fitted the hardware (ie power commander etc.). This is to cover us for time spent or potentially wasted on incorrect installation or faulty merchandise (Which - if we have supplied it is our problem).

Once a bike has been setup on the dyno, it is possible for the power commander to be removed from the bike, re-instated a month later, and there will be no need for a re-map. Unless "written over" the map is permanent in the memory of the Power Commander.

If any further modifications are made to the hardware of the bike, ie adding a race can or changing the complete exhaust system, the map can be tweaked to suit these modifications at a later date.

Click here to see what we did with our ZX6R (2003 Model)

If you have any further questions please e-mail us or give us a call.

01508 471919


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