If you have after-market exhaust and want to get the fueling dialed in correctly, then you need one of these tools. You take your bike to a dyno and map it for optimum hp and fuel across the whole load spectrum.
The PC3 will only allow you to remap your fueling, while the Tuneboy can do your timing map also, as well as give you direct access to the ECM constants (like fan temp, idle speed setting, etc)
Tuneboy also gives you full diagnostic access to all the sensors on the bike.
The primary difference in how they operate is that Tuneboy writes directly to the ECM; as you can see in the EBay ad, PC3 is a piggy-back' additional module that actually modifies the ECM's injector drive en-route to the injectors.
As mentioned earlier, one advantage of PC3 is that you can take it to just about any local dyno and they will be able to tune it - dynojet equipment & software & familiarity is extremely widespread.
In fact with Dynojet the 'tuner' doesn't even have to do anything - they just plug it in, run a few passes and the automated program spits out the settings.
Try even mentioning Tuneboy to most operators and they'll just give you funny look ....
There are also maps available that others have developed (on dyno) that you can simply load yourself. (applies to both PC3 and Tuneboy)
If you look at
this post you can see a couple of example 'maps'
As you can see, there are two axes - Throttle position and rpm - each cell represents a value for how much fuel is applied at that element
PC3, as mentioned earlier, is a delta system from the map in the ECM - so those values are either added (or subtracted if -ve) to the starting value.
With Tuneboy, that would be equivelant of the fuel trim table
You really don't have to worry too much about the complexities of the table - the dyno operator will work that out
Or you can just plug in an already developed map.
You can find some maps directly on
the PC3 site for example
Linear Mode
