Wrap Up And Dyno Run - From 88Ci to 106ci With S&S Cycle - Tech

We are at the final part of the S&S 106ci Hot Set-Up install on our '02 Road King. To wrap things up, we put the motor back into the bike, bolted everything together, and then installed the S&S VFI Module and ProTune II software. To bring the older bike up to date, we wanted to go from an open loop system to a closed-loop fuel injection system like what is found on newer models. The S&S VFI module and closed loop set up will allow us more tuning options with better performance from the bike. Once we installed the closed-loop system, we put about 1,000 miles on the bike, and gave it back to the guys at Bennett's Performance in Signal Hill, California, for some runs on the dyno.

The S&S VFI module is a direct replacement for the stock ECM with more programming options for tuning. It can also be upgraded to a closed loop system allowing the older bikes to get updated with the new technology. Here's a quick run down on the VFI module programmed with the ProTune II software and how it works with the S&S closed loop system. The VFI module starts with a set of base fuel maps for several displacement groups, you just need to program one that best fits your bike's setup. As you ride the bike, it makes fuel and air adjustments based on feedback from the oxygen sensors. Since a closed loop system provides real time metering from the oxygen sensors you get a more precise use of fuel to get the bike to run most efficient. The ProTune II software system then tailors the map to the specific requirements of your engine while you ride. So lets get this bike back on the road and see how well it works.