![]() ![]() The first is loading a non-RDRS Power Vision calibration into a RDRS equipped bike, this does not work it will set an assortment of engine codes, the CEL and Traction Control lights on the gauge cluster will remain lit, and RDRS will be non-functional. We’re running into three areas where users are making errors when tuning RDRS equipped bikes. While new to Harley, torque based tuning is commonplace among a broad range other platforms including several that Fuel Moto has supported for years, so this is not new to us and more specifically Dynojet and their engineers. Historically to get around this in our Power Vision tunes up to model year 2020 we’ve been able to simply turn off Torque based ETC tuning in the background and revert to conventional speed density tuning, however with the advent of RDRS this has changed as this new system requires torque based throttle control remain active as the systems work hand in hand. This is done for several reasons as a means to reduce throttle sensitivity & abruptness, to reduce driveline shock load & stress, and to limit power output when necessary. ![]() With a torque based calibration the ECM effectively delivers fuel, spark timing, and electronic throttle control based on a torque model, what this means is the ECM follows the torque model while monitoring engine load, RPM, twist grip, and other inputs and it essentially determines how much power it’s going to allow primarily via the twist grip to % throttle blade relationship. The H-D Motor Company starting using torque based throttle control several years ago in their OEM calibrations. We get quite a few inquires & questions on RDRS from customers & tuning shops and we’ve read some conflicting & incorrect information on various social media sites on how this affects tuning so we put together the following helpful info related to tuning with Dynojet Power Vision. Fuel Moto has tuned an extensive amount of RDRS equipped bikes, and we own a RDRS equipped 2020 Road Glide for in-house calibration & product development. What’s with that traction control switch? The Reflex Defensive Rider System otherwise known as “RDRS” on select 2020-later Harley Davidson® motorcycles is a new feature designed to control engine power & braking based on available traction during acceleration, deceleration, and braking to allow the rider better control of the motorcycle.ĮFI tuning of RDRS equipped bikes is different than other machines, however when understood and tuned properly the systems continue to operate as designed. ![]()
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