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Honda MX & Off-Road Dirt Bikes
Y09 CRF450R – Real Steering Dampener – Detail Post Ride Report
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[QUOTE="Rich Rohrich, post: 1327209, member: 16241"] With all due respect to the pipe companies, if you look at the sensors used on the bike, and the table based ECU mapping, you'll quickly see that there is no feedback mechanism built into this EFI design to make it "self-adjusting" in respect to major changes in engine air flow. The system calculates the mass of air entering the engine based on specific throttle, rpm, MAP and temp readings. From here it takes the calculation and determines the injector pulse open time and the ignition advance that corresponds to this air mass. What it doesn't do is MEASURE the air flow, so it has to make assumptions about airflow based on the dyno/lab measured air mass values of the stock components under various load and temperature conditions. There is nothing in the system to read oxygen content in the exhaust or changes in the mass air flow rate and provide air mass feedback information to the ECU. It's a Speed Density system using a fixed lookup table based on the calculation of the above parameters. If a pipe (or any mod) happens to fall within these Honda design parameters it will likely work very well, but keep in mind that mods that actually increase horsepower by definition have to change the mass air flow rate of the engine, and will require a corresponding change to the fuel curve at various points and usually ignition advance changes as well. For better or worse remapping the ECU on a system like this is going to be a necessary evil if any serious mods are undertaken. The good news is Honda designed this system to be easily modified by the average racer. It might be possible to get better results from the Yosh pipe with a change in the mapping. Time will tell I suppose. Thanks for the excellent write up and honest evaluation of the mods. Great job. :cool: [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
Y09 CRF450R – Real Steering Dampener – Detail Post Ride Report
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