Related Photo Galleries
This is the electronic fuel and ignition management system HHR is using to run the EFI, starting with the ECU (electronic control unit) on the left. It is the Pro Race System (PRS) from Perfect Power, a stand-alone electronic control system. Stand-alone systems are universal applications for any car, and don't contain any pre-determined fuel or ignition settings; they are programmed completely by the user. By running the engine on a dyno and testing it under various conditions, you can use your laptop computer to precisely adjust each of the points on the fuel maps for optimum performance under any condition.