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Discussion Starter #1
Can somebody help me with this, but I can looking for
Atmospheric Pressure switch loaction? and or pic of what it looks like?
bike: 2005 ZX10r
 

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Speed Freak
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located under the mid section of the tail section, in front of the passenger seat and behind the driver seat.
 

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It is not a "switch", it is a "sensor". It doesn't give an "on/off" type signal. It gives a voltage that is in proportion to atmospheric pressure.

The ECU uses this information (and also from many other sensors) to calculate how much fuel to inject. This is how the fuel-injected engines compensate for altitude. At high altitude, the atmospheric pressure is lower, so it reduces fuel delivery in proportion so that the engine still runs correctly. A loss in power at high altitude is unavoidable, but maintaining the air/fuel ratio correct ensures that driveability is maintained and that the loss in power is minimized.
 

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This post got me thinkin...

Does anyone know the refresh rate on the sensor...how often it sends a signal to the ECU?

If one were to relocate the atmospheric sensor to the inside of the ram air tube, as far forward as possible, would this improve the a/f ratio at high speed on the highway? Or, is the refresh rate too slow to provide any benefit?
 

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Speed Freak
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no this sensor is located there for a reason, there is another sensor on the throttle bodies that senses other but this sensor is to get a condition where wind is not blowing acros the opening to give it any in-accurate readings.
 

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There's no way to know how often the ECU takes a sample from this sensor. Atmospheric pressure is generally a slow-changing function; it is not necessary to sample it at a high frequency. But, it's also not very difficult for a modern ECU to take a sample at a high frequency.

Modern fuel injection ECU's recalculate the injection quantity on every revolution of the engine. There's no reason it couldn't sample the barometric pressure sensor at that very same frequency - although barometric pressure doesn't change with each revolution of the engine, so there is no need for it to do that. No way to know. Also, doesn't matter too much.
 
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