Fuel Injection Tuning - Fuel Management

The best way of setting up a PC, or any other fuel tuning kit, is on a dynamometer. Here, you can hold the engine at various points throughout its rev range at various throttle openings and analyze exactly what the fueling is doing. With the help of an exhaust gas analyzer, which sniffs the exhaust gas to see if the mixture is too rich or too lean, a dyno operator can quickly and easily adjust the fueling to suit all through the rev range.

Indeed, Dynojet's own dynos and 'Tuning Link' software automates this process-all the operator has to do is hold the throttle at the prescribed opening for each setting, and the dyno and PC do the rest.

The results will depend on your bike, your mods, and the amount of time and skill your dyno operator puts in. We've seen 1,000cc bikes with full race exhausts gain 9 hp peak gains from the pipe alone, then get another 6 hp from proper fueling. The biggest gains are often not at peak power, where the stock ECU settings are generally pretty good. It's in the midrange and on acceleration, where emissions regs and other compromises hold back the stock setup. This is where a proper fueling tune can really make a difference.

Whatever your bike, whatever your mods, it's pretty much certain that some proper fuel injection tuning will make it work a whole lot better.

My Bike's Stock-Do I Need A Power Commander?
When manufacturers design bikes, they have to comply with regulations on exhaust emissions and noise, and suit the base-level fuel standards of the entire world. So the standard fuel injection map inside your bike's ECU may have some compromises in it to meet these. That means even a stock bike can see improvements from a fuel injection tuning box following the same optimization program as with a modified bike. As ever, a trained, experienced tech will generally net the best results.

How Does Fuel Injection Work?
There are three main parts to a fuel injection system-the fuel injectors, a set of sensors and an ECU. The injectors are simply small electronic valves that open when energized by an electrical signal. When open, they allow pressurized fuel to spray out through the injector nozzle, and into the inlet air flow. The sensors are positioned around the engine and bike, and they measure the inlet air temperature, engine coolant temperature, crank and camshaft position, throttle position, and a range of other factors. All of these sensor inputs are fed into the ECU, which uses them to calculate the optimum amount of fuel needed by the engine. The ECU then sends a signal to the injectors to open at the correct time, and for the correct amount of time, and the result is an ideal air/fuel mixture.