Based in Grimsby Lincolnshire, Chris Gunster Limited specialises in the service and modification of modern motorcycles for road and race.


   Offering a selection of performance parts to suit your budget and application, we offer a wealth of experience and expertise to ensure that you make the right choice.


   We are Lincolnshires only approved Dynojet Tuning Centre. Our services include the supply, installation and complete set up of all related products including Dynojet    Power Commanders, Jet Kits, Ignition Modules and Quickshifters. We specialise in fuel injection and carburettor tuning using our Dynojet dynamometer.


   We have a large stock of motorcycle tyres from Avon, Bridgestone, Dunlop, Pirelli, Metzeler, Michelin and Maxxis. Benefit from our complete tyre fitting service while you    wait.


   An established MOT testing station for class 1 & 2 motorcycles.


   Please browse through our dedicated service pages and feel free to contact us to discuss any of your requirements or to make a booking.

NEW POWER COMMANDER V

FOR SELECTED 2009 BIKE MODELS



Auto Tune your Bike


Auto Tune from Dynojet automatically adjusts the fuel map on your bike while you're riding!


*Self Tune with AutoTune Accessory sold separately. Rev Xtend and Fuel & Timing control only available Harley Davidson models.

UK Power commander kits are priced

from only £279.65 inc VAT

How much additional horsepower will the Power Commander give me?

Well that can depend upon many things but what we can tell you is "The perfect air/fuel ratio will ensure that the engine can produce the maximum possible horsepower for that given combination". We must also understand that a typical street rider spends a great deal of time riding in part throttle conditions. Shown below are two graphs of a motorcycle before and after installation of the Power Commander.


The top graph shows the horsepower curve accelerating at a 40% throttle opening and the lower graph shows the corresponding air / fuel ratio. You can see a large horsepower increase between the two. The red curve shows a typical stock motorcycle with minor performance modifications (slip-on exhaust). The blue curve shows that same combination with the PC installed and you can see that the line is nearly straight. So the rider will feel a large improvement while riding the motorcycle and it is very possible that the peak wide open throttle horsepower is unchanged. The correct air/fuel ratio number (say 12.9:1 or 13.2:1) depends upon many factors like combustion chamber design but what we want is that figure at every point in the curve (straight line).


How can I tune with the Power Commander?

Base Map

The Power Commander is supplied with a given (base) map stored in the microprocessor. This (base map) is typically a map that has been developed to provide an improvement for most combinations matching the map description (i.e. stock bike or performance exhaust and air filter). In general we have found that a typical stock bike has areas in the fuel curve that are far from optimal for drive-ability and performance. We could say that they are typically 70% optimised in stock condition and 60% - 65% with minor performance modifications. After installation of the Power Commander with the base map, we would expect to see 85%-95% optimizations.



Alternate Maps

Each Power Commander is supplied with a number of alternate maps on a CD-ROM and all the maps are available for download on our web site. You may notice that we have a map specifically for "Brand A" slip-on exhaust and another for "Brand B" slip-on exhaust. Although the difference between the two maps is likely to be very small, these difference will increase the optimizations for that given combination. If you have a "Brand C" exhaust and we do not have a specific map, you should find that "Brand A" or Brand B" maps will provide a good improvement on your bike.

If you do not have a Windows 98SE/ME/2000/XP computer and you require a special map that Dynojet has developed, ask your dealer to upload that special map at the same time you purchase the PC. Some dealers have invested in a Power Programmer from Dynojet which allows them to connect any PC to their computer and upload any of the maps available from the CD-ROM or web-site.



Face Plate Buttons

You can change the fuel curve with the faceplate buttons. This is a simple adjustment that can move the fuel curve richer or leaner in each area of the map.


Computer Mapping

If you have a Windows 98SE/ME/2000/XP computer, you can upload alternate maps or make changes to the existing map using the Control Centre software and link cable (Serial or USB depending on model) supplied with your PC.


How do I get 100% optimisation?

First ask yourself is it necessary?

You installed the PC, you noticed a positive improvement and the most annoying problems like overheating, surging or pinging have been eliminated. In this state you are probably 90% optimised. If you desire 100% optimisation or you require a custom map for a special application, you must select a dealer that has the proper equipment and training to accomplish this for a reasonable cost and without damage to your motorcycle.

Dynojet has trained hundreds of dealers throughout the world that can offer you this service. Dealers who have the proper equipment installed and pass a detailed Power Commander Training School at the Dynojet facility, will be given the distinction "Dynojet Approved Power Commander Tuning Centre".



Ignition

Power Commanders for some models can also control the Ignition Curve. All Harley-Davidson PCIII USB models have ignition adjustability. You can adjust the ignition curve for increased part throttle response, increased peak power, or to eliminate detonation. On most models the ignition curve is close to optimum for "pump" fuel. In some cases it is possible to increase part throttle torque by adjusting the timing. With high octane racing fuel further gains can be realized at wide open throttle. Harley Davidson models, in some configurations, can benefit from a reduction in timing advance. If heavily loaded or during hot weather the PC can be adjusted to eliminate the "pinging" that is so common during these conditions.


Ignition Module

Allows you to control and adjust the ignition timing of your motorcycles' engine. This module uses direct coil driver technology and allows a high degree of timing adjustment. Advance or retard the ignition curve, based on a combination of throttle position and rpm. Each cylinder can be individually tuned.


Power Commander Colour LCD Display

This ' touch-screen' LCD display connects to any Power Commander USB via a "quick disconnect" cable. Designed to remain on the bike, both waterproof and durable.


Multi Function Hub

This is designed to allow bikers' access to advanced expansion features. Several optional harnesses are available to permit both input and output to/from the module.


Quick Shifters

This allows full throttle, clutchless shifting. By momentarily cutting the fuel and or ignition, which unloads the transmission, the rider can shift up to the next gear without rolling off the throttle or using the clutch.


Map Selection Switch

This allows the rider to switch between two different maps logged within the Power Commander.


ESRM

Dynojet's ultra compact replacement stock servo motor and cable assembly for Yamaha's.