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03-22-2007, 07:30 AM
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Understanding Fuel Injection
[align=center]Understanding Fuel Injection[/align]
[align=center]  [/align]Since fuel injection is becoming more fact then fiction for motorcycles. I thought that a little basic coarse on terms and theory might be useful to all of us. Some of this is from an article from Easyrider tm. 1) ECU this is the electronic control unit. Reads crankshaft position (degrees from stock ignition) this tells the ECU when to inject fuel. 2) TPS this is the throttle position sensor and tells how much fuel to inject. 3) MAP this is the manifold absolute pressure. Sensor blends the first 2 reading to give a smooth throttle response. 4) IAC this is the idol air control. Holds the rpm’s up while cold motor warm ups. Many of these 4 items above have multiple purposes let’s start with the ECU. The ECU senses temperature so it knows the correct amount of choke to be used with the IAC and holds the R.P.M.’s up during the warm up progress. The ECU also controls fuel and spark to prevent overheating. In addition it takes readings from the TPS and depending on rpm’s and temp delivers an appropriate accelerator pump shot. The fuel pressure regulator is very precise and instantly controls the fuel pressure from zero to max flow, and it does all this without stalling the fuel pump and burning it up. The pressure regulator will channel off excess fuel and return it to the tank, as not to overload the fuel pump. Injector nozzles themselves are another reason why fuel injection is here to stay. Their spray pattern makes them very efficient. In the old days a carburetor would just deliver fuel and hoped that enough air was being sucked to atomize the fuel for burning, however with injection the injector give us a better fuel spray pattern mixed with a better control of air intake. Nowadays these units are very reliable and precise, because of them in part is why we see longer life in the motors of today. No excess fuels to contaminate your oil, or to build up on your valve train and because of precise fuel measurements you achieve faster starts which is less work on the electronics of your v-twin. Now we could get more technical, but let’s face it for the most part it wouldn’t do us much good would it. The only other thing I want to touch on here, is the word maps, chip burn, and download. These are the most common terms used to describe a serious of electronic commands to operate the computer on your bike. Map is a tailor made program for your specific needs and will tailor the computer to conform to its best ability and allow for modifications such as cams, air box, head work, higher compression and exhaust changes. Chip Burn and Download are the same, they are a pre-built map for general purpose use, and are unable to adjust for specific needs such as, big sucker vs. SE air cleaner, or straight pipes vs. slip-on mufflers. I hope this has helped you all to better understand the basic fundamentals of your v-twin motor. Thanks for reading. [align=center]Researched by: Wreckerman[/align] 
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03-22-2007, 08:08 AM
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Re: Understanding Fuel Injection
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03-23-2007, 02:12 AM
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Re: Understanding Fuel Injection
coolmaker i send a bunch of tech stuff to speedman to let him clean up or toss depending on what he thought you guys needed thats why i did not post it , besides i don't have the fucking time around here lately not setting on a beach like you are
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03-23-2007, 02:16 AM
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Re: Understanding Fuel Injection
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