Whether or not you need to physically unplug your O2 sensor(s) from your bike's wiring harness is listed as a NOTE in bold in each specific year/make/model's ECU Flashing Service product description. After reading those notes, if you still aren’t sure if your O2 sensor(s) should remain plugged in after your ECU has been flashed, send us an email and we’ll be happy to confirm one way or another! If not unplugged, the O2 sensors will allow closed loop operation to interfere with the custom mapping that we flash into the ECU, and throttle response and/or transition will not be nearly as smooth as it should be! There are some exceptions to this, as some motorcycle models’ closed loop operation can actually be manipulated and/or overwritten with our ECU flash, and some select models actually still function very well with closed loop operation maintained and fully functional for a number of different reasons. Closed loop operation, as explained above, is already sub-optimal for most motorcycle engines from a performance, throttle response and combustion temperature standpoint. The O2 sensor(s) should, almost, always be unplugged and closed loop operation disabled. Q: Can I leave my O2 sensor(s) in place when I flash my ECU?Ī: In most cases, no. In open loop operation, without the input of the O2 sensor(s), the bike has no way of knowing that it needs to be adjusting fuel delivery for any modifications that you’ve made to the bike! Once your bike’s throttle opening percentage, engine load and/or engine RPM exceeds the closed loop operation parameters (this is usually above only 10-15% throttle and roughly 1/3 of the way through an engine’s RPM range) the O2 sensor input is ignored in what is known as “open loop operation”. Your bike’s O2 sensor(s) are also set to maintain a fixed, lean (generally 14.7:1) air:fuel mixture for emissions purposes, which is not optimal for performance, throttle response, or engine longevity. Closed loop operation only controls VERY small portions of most motorcycle’s engine throttle, RPM and load range. Most modern motorcycles do utilize at least one O2 sensor that controls what is known as “closed loop operation”. Q: Won’t my bike “self-adjust” for my new intake and/or exhaust system?Ī: Not very well. In our opinion, the better question to ask is why would you NOT want to flash your ECU, remove any emissions restrictions and have custom ECU mapping to match your bike's specific intake/exhaust modifications?! That said, not having appropriate custom ECU mapping for your motorcycle's specific intake/exhaust modifications can SIGNIFICANTLY shorten the life of some expensive internal engine components, such as the pistons and valves. Q: Do I “need” to flash my ECU if I modify my intake and/or exhaust system?Ī: No, this is America and you can do whatever you want! USUALLY, flashing your ECU isn’t “necessary” in the sense that NOT doing so will somehow cause immediate and catastrophic damage to your engine (in most cases). To better understand the performance improvements that will be made to your specific motorcycle with our ECU flash, check out the example dyno graph(s) listed in the Mail-In ECU Flashing Service product description for your specific bike. In other words, this means that your bike will simply run smoother, stronger and cooler than it ever has before! With our custom ECU mapping, built SPECIFICALLY on our dyno for your motorcycle's EXACT aftermarket intake/exhaust combination, your engine's peak performance, throttle response (and on/off throttle transition smoothness), and longevity will be improved. With our ECU flash, all of those restrictions are removed.įurthermore, installing aftermarket intake and/or exhaust components to improve airflow through the engine are incredibly popular modifications that many owners choose to make to their motorcycles, but without appropriate custom ECU mapping to match the improved airflow provided by those parts, the bike simply won't ever run as well as it should. In most cases, ALL of those restrictions are present to varying degrees in Euro 4 and Euro 5 emissions complaint motorcycles (ESPECIALLY for US production models). Whether those restrictions come in the form of electronic throttle restrictions, ignition timing restrictions, and/or lean fuel mapping for emissions compliance is specific to each motorcycle's year and model. Q: What will having 2WDW flash my motorcycle's ECU actually do for me?Ī: All modern motorcycles come with some form of restriction(s) built into the stock ECU mapping in one form or another for emissions compliance.
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