Ambient temp sensor?

[Magdave]

So I am wondering if anyone else thinks the ambient temp sensor on RT's may be part of the fix for the hot engines? My thought is the location near the radiator makes it heat soak 5-10deg above true ambient temp. I know mine does. Does that play into the fuel mapping? My mind tells me EFI cars lean the mixture the hotter the ambient temp is thus if the sensor is incorrectly reading it is it leaning the fuel mapping. Thoughts? :thumbup:

 

[Art Mann]

I doubt if the ambient temperature sensor has anything to do with the fuel air mix on the Spyder. The oxygen sensor in the exhaust is used by the engine controller to determine rich/lean and keep the engine at close to stoichiometric conditions. That is the best way to control the engine so it will pass environmental requirements. The engine probably run a little cooler if the mix was rich.

 

[Chupaca]

Let's see..!!

there was a recent post where some sensors were not bolted in place at assembly. Once installed properly there was an improvement. You could try repositioning the sensor and see if there is any noticable effect....:thumbup:

 

[cuznjohn]

dave i doubt it, but you never know how they set the bike up. really good question

 

[Roadster Renovations]

I know on autos, they put an air charge temp sensor in the air filter box. That way the air that actually is drawn into the engine temperature is measured. If the fuel strategy is being controlled by a sensor away from the air that the bike is drawing in, and is affected by the radiant heat from the engine, that could be a big issue. And putting it closer to the air actually going into the engine could possibly make that better.

 

[Magdave]

I know on autos, they put an air charge temp sensor in the air filter box. That way the air that actually is drawn into the engine temperature is measured. If the fuel strategy is being controlled by a sensor away from the air that the bike is drawing in, and is affected by the radiant heat from the engine, that could be a big issue. And putting it closer to the air actually going into the engine could possibly make that better.

:agree: My thoughts exactly. I have always wondered why it is not in the snorkel on the left side going into the airbox. It is disturbing to me to look at the temp on the screen saying 86 when I know it is 79 all around me for example. I just do not know enough about the fuel mapping on the spyder to know if the sensor IS being used or not. :dontknow::dontknow: Just wondering.

 

[billybovine]

:agree: My thoughts exactly. I have always wondered why it is not in the snorkel on the left side going into the airbox. It is disturbing to me to look at the temp on the screen saying 86 when I know it is 79 all around me for example. I just do not know enough about the fuel mapping on the spyder to know if the sensor IS being used or not. :dontknow::dontknow: Just wondering.

This particular design of sensor cannot be put in a moving stream of air because it is a atmospheric pressure sensor as well. To adjust for altitude changes. So if you move it keep that in mind. So in the snorkel will not work.

 

[Magdave]

This particular design of sensor cannot be put in a moving stream of air because it is a atmospheric pressure sensor as well. To adjust for altitude changes. So if you move it keep that in mind. So in the snorkel will not work.

Hmmm I seem to remember it was dual sensor. That rules out putting it in the air box too it read 150deg when it is 60 deg ambient:yikes::roflblack:. Still it does not accurately reflect the actual ambient temp and the difference is not linear so if used as any type of input device to fuel map it will be all over the place.:dontknow:

 

[jcthorne]

So I am wondering if anyone else thinks the ambient temp sensor on RT's may be part of the fix for the hot engines? My thought is the location near the radiator makes it heat soak 5-10deg above true ambient temp. I know mine does. Does that play into the fuel mapping? My mind tells me EFI cars lean the mixture the hotter the ambient temp is thus if the sensor is incorrectly reading it is it leaning the fuel mapping. Thoughts? :thumbup:

I think your theory is spot on, just not sure of a reasonable way to test it.

 

[Art Mann]

If you want to know what controls the fuel/air mix ratio of modern engines, you can read about it in the link below. Just scroll down to where it talks about automotive applications. The manifold pressure sensor (if the 1330 has one) and the charge temp sensor (which may not be what the OP was referring to) are secondary inputs.

http://en.wikipedia.org/wiki/Oxygen_sensor

 

[Magdave]

If you want to know what controls the fuel/air mix ratio of modern engines, you can read about it in the link below. Just scroll down to where it talks about automotive applications. The manifold pressure sensor (if the 1330 has one) and the charge temp sensor (which may not be what the OP was referring to) are secondary inputs.

http://en.wikipedia.org/wiki/Oxygen_sensor

The 998 has MAP sensor it is one that the hoses rot out on from the heat so I assume the 1330 has it too.:thumbup:

 

[Magdave]

I think your theory is spot on, just not sure of a reasonable way to test it.

Me either but the select few who were running the BRP Heat Fix test said something about that sensor being moved IIRC since the reversing fan would really play havoc. I would assume an ad on harness but no mention of where it was moved to.:dontknow:

 

[Gray Ghost]

Me either but the select few who were running the BRP Heat Fix test said something about that sensor being moved IIRC since the reversing fan would really play havoc. I would assume an ad on harness but no mention of where it was moved to.:dontknow:

Here are the instructions on changing the AAPTS location.

 

[Magdave]

Here are the instructions on changing the AAPTS location.

Can you resize that to a readable size? Is that the instructions from the Heat fix kit?

 

[Bob Denman]

Dave,
I agree with "JC". :thumbup: Those instructions for moving it might be the key... :shocked:
I'll try to blow them up, and still keep them legible.

The trick to that sensor's readings: if it's reading too warm; it'll be putting too little fuel into the mix. This'll lean the engine out, and RAISE the temperatures.
My Question to BRP: did they account for this with the fuel mapping? :dontknow:.

 

[Bob Denman]

Try this one...

I HOPE, that you can read it... pps:

Click on it, and keep your fingers crossed.

 

[finless]

The instructions say "New AAPT sensor" not moving it. So make me wonder if the sensor is different too for this heat fix kit?

Bob

 

[Bob Denman]

You could try moving the OLD one, and see if it likes the new location...
Has anybody looked to see if the ones on the 2014s are located in the airflow coming through the front "nostrils"?
Perhaps they built a new one, to take airflow into effect..:dontknow:

 

[jcthorne]

Looks like they are moving it to the void space above the left air tunnel where the horn is located on 2013s.

 

[Yfactor]

Can you resize that to a readable size? Is that the instructions from the Heat fix kit?

When you bring up the image hold control key and press + or minus to enlarge or reduce the image