It may sound cool, but is quite hard on the exhaust valves and will eventually blow the packing right out of your muffler. Q: Do I need to block off my AIS/PAIR system?Ī: In most cases, your bike’s AIS/PAIR system (the stock air-injection system equipped on most modern motorcycles for emissions compliance) should absolutely be removed, plugged or blocked off in some way! Once an aftermarket performance exhaust system (without a catalytic converter) is installed on your bike, this system will cause significant backfiring on deceleration. In fact, almost all of the barometric pressure sensors we tested provided accurate fueling adjustments until around 10,000 feet up! We actually tested several of these sensors in one of the most extreme riding conditions on the planet when we were supporting several racers and teams at Pike’s Peak, and they provided perfect fueling adjustments for the extremely wide variety of atmospheric conditions we were able to subject them to in this environment.
Q: If my bike’s O2 sensors(s) are unplugged, how will my bike adjust for my specific environment and/or climate?Ī: All modern fuel injected motorcycles are equipped with other input sensors (such as intake air temperature sensors and barometric pressure sensors) that still play a significant role in BOTH closed loop AND open loop engine operation fuel mapping algorithms! These other input sensors are left completely operational in ALL cases by our custom ECU flash, and they adjust for specific environments and climates extremely well. If you aren’t sure if your O2 sensor(s) should remain plugged in after your ECU has been flashed, sent 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. Q: Can I leave my O2 sensor(s) in place when I flash my ECU?Ī: In most cases, NO! The O2 sensor(s) should, almost, always be unplugged and closed loop operation disabled. 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 (14.7:1) air:fuel mixture for emissions purposes, which is not optimal for performance, throttle response, or engine combustion temperatures. 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 exactly. Truly, the better question to ask is why would you NOT want to flash your ECU, remove any emissions restrictions and have custom mapping to match your specific combination of intake and/or exhaust modifications?! Having us flash your ECU with our custom mapping will (to put it simply) significantly improve performance, lower engine operating temperatures, and smooth out both your bike’s throttle response AND on/off throttle transition throughout the entire RPM range! That said, not having appropriate custom mapping for your specific bike and intake/exhaust system can significantly shorten the life of some internal engine components, such as pistons and exhaust valves. A: 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 bike.
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