Another air temp sensor question

[Neonguy95]

Went riding this weekend with a group of friends. Two guys were on GS1200 and another on his DL650. One of the GS riders has his intake temp sensor wired to the outside of the air box to measure the exact temprature of the air, not the temp of the air after it comes through the air cleaner. This slightly changes the fuel mapping and according to him and a lot of GS owners improves performance.

I have noticed while watching the sensor and knowing what the outside air temp the temp is usally 6-8° warmer than actual air temp. I do not have a service manual yet, so I do not know if relocating our sensor is A) possible and B) worth trying.

Thoughts? Opinions?

Rusty

 

[jozmoto]

I have noticed while watching the sensor and knowing what the outside air temp the temp is usually 6-8° warmer than actual air temp.

Same thing here. I had a GS and it was very accurate and updated quickly. I like to know what the temp is as I go up and down mountain passes but the stock air temp updates too slowly and reads too high. Also, if the ecu is using this to correct fuel parameters, then is is using the wrong value.

 

[Neonguy95]

According the the GS owner I got this information from his was not correct until he moved his sensor. I amtold he bought a new sensor with a extended cable to allow him to mount the sensor under the front fender to read clean air before it hits any motor temps. Our sensor could be moved to the "air tunnel" before the air cleaner to allow it to read clean air temp and stay protected.

After finding a part manual it appears there is only one air temp sensor. So not only does the ECM use this sensor to map fuel it also uses it for the display.

Rusty

 

[rem]

I have found my temperature display to be accurate, but it is definitely slow to react. And variable in speed. sometimes it seems slow, other times ... very slow. I dunno. R

 

[NoMorBills]

Yes it would be nice to see the temp show what I am feeling on my skin as I drop down or go up in elevation or into a raven or out into the sun. But do I need a gauge to tell me this? I am already feeling it. ::021::

From my days of rejetting, the temp drops then the air is denser and I need to go richer. So if I want to trick my ECU then yes move it to make it read cooler. With 1200cc I think I have all the power I need. I like my gas milage the way it is.

 

[markjenn]

I don't think the GS mod is to get a more accurate air temperature - it is to get a generally lower air temperature than the engine is actually seeing so the computer will richen the mixture a bit. This is a poor man's way of emulating various aftermarket devices that artificially lower the air temp reading to richen the mixture, which are, by further extension, a poor man's power commander.

The S10 temp sensor does tend to heat soak and take a lot time to come down to ambient. Not sure why. But at speed, it does seem to eventually come down to whatever the ambient is, more or less. The readout also has an odd granularity about it - rather than marching up and down by a degree, it tends to be stable, then jump by 2 or 3 at a time. I suspect there is some kind of algorithmic table look up happening to convert the input signal to degrees - this is sometimes done because the code is simpler than doing linear computations. There also may be some software damping for the readout. Thus, the readout may not precisely reflect what the ECU is actually using for fueling.

- Mark

 

[Koinz]

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[stevepsd]

I have a external temperature sensor on my ST and the bikes Inlet Air Temp gauge usually reads about 5 degrees higher than ambient. I have seen it 15 degrees higher when doing extended, slow off-road trails.

The temp sensor is slow to cool down because it is in the airbox and where do you think all the engine heat goes when you shut the motor off? It goes up, where the airbox is.