There seems to still exist a shroud of secrecy enveloping the magic hidden inside your Harley’s ECM. It’s as if many of the current owners of the EFI generation of Harley motorcycles simply choose to believe that tuning a computer-controlled machine is far outside their realm of comfort. The far better reality of electronic fuel injection (EFI) is the near infinite range of adjustments that can be utilized to properly tune your machine for any and every part imaginable available today. Yes, it takes some getting used to so you know what parameters you are working and what each of them does to your V-twin’s engine. With a little can-do attitude and the proper help, you can do it yourself.
Helping us DIY types is the Dynojet Power Vision (PV-1 $549) tuning module. By utilizing the touch-screen Power Vision, you can download and store different tunes that can be flashed to your bike. The easiest way to tune your H-D is to use the Dynojet preconfigured tune files. Very simply, the Power Vision identifies your bike’s information and automatically sorts applicable dyno-proven tunes for you to choose from. Hundreds of tunes are available and then organized into relevant categories such as stock improved, air intake kits, slip-ons, full exhaust systems, cams, etc., for ease of your use. You can also get one-off tunes uploaded by a custom tuning shop, or received via email and load them right on the device to be further tweaked or directly downloaded and run. The Power Vision holds up to six tunes for you to choose from at your convenience, and these can be replaced as many times as you like with updated tunes. One of the cool things about the Power Vision is that it will save your original ECM settings so that if you ever want or need to go back to stock you can do so. Check engine light came on? You can also read and erase diagnostic codes with the handheld unit.
For our intents and purposes, we’ll be focusing on the custom tuning aspects of the Power Vision and Dynojet’s included WinPV tuning software. After installing a set of Lunati camshafts in our ’04 Fat Boy, we originally used a Dynojet pre-configured file based on our Softail’s mods to get us close to correct and up and running with little fuss. We knew there was a little more to be found and we wanted everything tightened up just a bit to make our engine run perfect. With the advanced features of the Dynojet and its Windows-based WinPV software, we can alter nearly all the engine’s parameters by each cylinder. Adjustments controlling spark timing, fuel trim, idle RPM, and volumetric efficiency are at hand in the software’s function screens, giving you the power to ultimately fine-tune everything from a stock engine to a high-performance V-twin. Thanks to dyno time at Anaheim Fullerton Harley-Davidson and a visit from Dynojet’s Technical Advisor, Patrick Daniels, we got a peak behind the secret veil of EFI computer controls. HB
**Anaheim Fullerton Harley Davidson **
(714) 871-6563 | harleyfullerton.com
(800) 992-3525 | dynojet.com