- How can an ECM that can only read OEM narrow band sensor’s voltage use conditioned signals from wide band O2 sensors? The ECM can accept the voltage coming from the wideband sensor by “hand shaking” with a conditioning device that, when installed in the motorcycle, translates the wide band signal into something that the ECM can utilize.
- Is the system “just close enough” concerning the AFR values or very precise with regards to the VE tables each time you power cycle the ECM? The VE tables are levelized from the onset and in the background recalibrated through the use of adaptive learning base code and AFR sensors. Every time you ride, the tables are adapted real time. This means that once you start the bike up and it comes up to temperature and you go ride, it remembers where it was the time before and the values have already been populated.
- How does our system control ignition timing verses competitive systems? Our system controls timing solely based on engine load. Not based on an Alpha-N/RPM/TPS/MAF value. The problem with competing systems is that they assume a load. In reality, when you open the throttle, engine load takes a period of time to come up. Our system is accurate within 1/4 degree of spark placement based on that engine load.
- In the past there have been documented issues with the Delphi Ion Sensing spark control retarding timing inadvertently and degrading power. Does this exist with the Precision system? We utilize the very latest, perfected Delphi sensing algorithms to alleviate any missteps in timing control and they are fully utilized in all RP Precision systems, across all models from 2004-Present.
- How is appropriate AFR calculations achieved for a wide variety of engines based on displacement, exhaust, engines mods, etc.? The reality is that, except in extreme cases, all H-D engines, including the V-Rod, respond best with certain AFRs in certain places. For example: For best idle and off idle response the AFR is 13.0-13.2. For best fuel economy in cruise that number is 14.3-14.5. And for a best power scenario, the AFR drops to 12.9-13.2. These numbers are not a guess but the result of countless hours of dyno and real world testing by not only the team at RP but top tuners around the country.
- How do we calculate the ignition timing maps that are uploaded into a customer’s ECU? Timing maps are selected based upon the customer’s data sheet and populated using data from different build levels and sizes not only from our own controlled dyno facilities but also data compiled from successful map curves from builders and individuals around the country.
- Can an ECM be returned to stock after RP has prepared it? Yes, the ECM can be returned to stock without issue.
- If a wide band sensor fails will the bike still run? Yes. The motorcycle will run and will return to the default map and adaptive learning will be disabled. However, as soon as the failed sensor is replaced the ECM will revert back to adaptive learning mode automatically. The initial start up procedure must be performed and the system will function as before. It does not have to be returned to RP.
- Is it a bad thing that the system reverts back to the base map compared to Alpha-N based systems that lock at the current VE tables? Not at all. The fact of the matter is that modern O2 sensors almost never fail in an instantaneous manner. Generally there is a degradation over time that occurs and it would not be optimum to run a system that locks into a sometimes very degraded or even harmful VE table scenario and then has to be reset and re-learn itself over a significant period of time.
- Does the RP Precision system disable or interfere with the ability of the dealerships to trouble shoot and/or diagnose with the Scan Tool? No. The ECM will function completely normal and will produce DTC codes, logic diagrams and diagnostic reports as normal.
- When must the ECM be re-calibrated? The only time the ECM must be re-calibrated is when a displacement change of +/- 20% occurs, an injector of a different parameter is installed or a significantly larger throttle body diameter is installed.
- Does the controller send a skewed signal to “fool” the ECM or does the Delphi system actually have adaptive learning capabilities? The stock Delphi system on all 2005-Up motorcycles is already an adaptive system due to the fact that it utilizes narrow band O2 sensors. We simply leveraged our ability to design a software package to interpret a signal sent to the ECM and convert it into a much broader range of capability.
- If the engine is, say, a stock 96" and the customer installs a full Screaming Eagle Stg. 2 103" kit will the ECM have to be returned? No. This is well within the parameters of the system. The initial start-up procedure is followed and the customer continues on as before.
- What does a +/- 20% variance mean with regards to the way the system tunes the motorcycle? Is this a wildly swinging optimal calibration “arc” or does the system determine the most appropriate VE table and stay there? The calibration determines the most appropriate VE table for the given combination in real time and stays there. +/- 20% is simply a range of displacement swing before the unit must be recalibrated.
- Will the factory warranty a motorcycle that has this unit installed? The factory will approach warranting with this system in the same manner as bikes with other competing aftermarket systems installed.
- What if my ECM fails altogether? Simply return the replacement ECM to RP and we will re-load your previous calibration. All customer calibrations are stored on a secure database server.
- Does the system inhibit the function of any OEM systems such as cruise control, security system, etc.? No. All OEM systems will function as normal. For bikes that have an active security system, a special “handshake” proceedure must be performed before the bike will start. See the procedure here.
- Why don’t I have a 2004 Instruction Manual with the EMS for a 2004 model? Our Instruction Manuals went to press before we had tested the installation of the EMS on any 2004 models. The only difference is the ECU, which, on 2004 models, must be replaced with a 2005 or newer ECU. Once this is done the 2005 installation instructions can be followed.
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