2013 RT Ambient temp question.

[Magdave]

I am just wondering about the 2013 RT ambient temp sensor read out. I know where it is just in front of the radiator tucked back in. My question is I have never seen mine read the actual outside temp usually at least 5deg hotter even going down the road at decent speed. My Terrain reads accurate temps and the sensor is as near to the road as the Spyder. I am guessing it is from being so close the radiator. The question is does the ECM use that temp to adjust the fuel tables and could that be a possible source of the bikes running a little lean? What effect would it have on the fuel if it read accurately?

 

[Jeriatric]

I am just wondering about the 2013 RT ambient temp sensor read out. I know where it is just in front of the radiator tucked back in.

My question is I have never seen mine read the actual outside temp usually at least 5deg hotter even going down the road at decent speed. My Terrain reads accurate temps and the sensor is as near to the road as the Spyder. I am guessing it is from being so close the radiator.

The question is does the ECM use that temp to adjust the fuel tables 》yes

and could that be a possible source of the bikes running a little lean? 》it could

What effect would it have on the fuel if it read accurately? 》most lkely a positive effect - to what degree ?

This has been discussed before but don't know of any real world test results.

 

[Magdave]

I am wondering what could be done to get a more accurate temp reading too:dontknow:

 

[Chupaca]

As I see it..!!

the sensor is on the right side of the frunk ahead of the coolant radiator on the 2012 RS. If they moved it (don't think they did) closer to or into the engine compartment the heat would be much higher. The sensor measures the temp of the air entering the throttle body and needs to be near the air intake..:dontknow:

 

[Magdave]

the sensor is on the right side of the frunk ahead of the coolant radiator on the 2012 RS. If they moved it (don't think they did) closer to or into the engine compartment the heat would be much higher. The sensor measures the temp of the air entering the throttle body and needs to be near the air intake..:dontknow:

I know where it is at I mentioned it in my original post it is not in the frunk it is tucked into a cavity in the side of the right nacelle. It obviously it getting heat from the radiator being so close but my question is how to and is it worth moving into the wind stream if it is even possible? You are right it should probably be on the left wheel well where the air intake is. It seems like a bad idea to me if it is used to determine fuel tables if it is not reading the actual ambient air going into the intake.:dontknow:

 

[Dizneyman]

20011 RT and mine also reads about 5 degrees high. Seems everyone's does. Do not think it's used for anything but reporting ambient temp according to my dealer.
No heat issues either btw.

 

[Jeriatric]

20011 RT and mine also reads about 5 degrees high. Seems everyone's does. Do not think it's used for anything but reporting ambient temp according to my dealer.
No heat issues either btw.

Your dealer is right. It's reporting the closest ambient temprature number possible, considering the location of the temprature probe. That number (however inaccurate) is reported for fuel maping purposes. A secondary use of that reporting is the temperature indicator in the driver display.

 

[CruiseRT]

The best place to put it would be in the inlet air duct to the throttlebody. That would give you the actual air temp to the engine. If they use it for fuel mapping that would allow for more acurate adjustment. I know on some old turbo-charged engines we had at work the higher the air temp the sooner the engine would go into detonation, you have to retard the timing or back the fuel down. Also on our turbines we used the inlet air as our ambient air temp because the air is always moving not stagnate.

 

[Bob Denman]

A higher temperature reading will only richen-up a mixture anyway; I see no harm from it being hidden where it is...
...unless you count the inaccuracy of the thermometer readings as a problem!

 

[Jeriatric]

http://www.spyderlovers.com/forums/showthread.php?33555-Outside-Air-Temperature-Sensor


Old news, same subject. Post 13 and 17 speak to having moved the temprature probe.

 

[Jeriatric]

http://www.spydertalk.com/forums/topic/4739-how-to-locate-spyder-aapts-temp-sensor-location-pics/

Very informative and some great pictures.

 

[3 Wheel Addict]

Anybody try this, I did... mine is off even with the bike not being run. My bike is in the cold garage and has not been started in over 3 weeks but I just went and turned it on and the temp is reading high. About 6 or so higher than the thermometer hanging on the wall, that rules out radiator heat affecting it.

 

[Jeriatric]

Anybody try this, I did... mine is off even with the bike not being run. My bike is in the cold garage and has not been started in over 3 weeks but I just went and turned it on and the temp is reading high. About 6 or so higher than the thermometer hanging on the wall, that rules out radiator heat affecting it.

Currently 57 degrees in my garage. Spyder sensor in stock position and reads 57 degrees too.

 

[Magdave]

The last 2 posts interest me. Where I am headed in this thought is why do some report 33mpg and others never see it on their best day. What is different? This sensor has popped into my head a s possible cause. Bob I think you ( or I ) have it bassackwards. Hotter air means less fuel needed for ignition. Leaner is hotter engine wise.

 

[CyncySpyder]

Things that make you go ....................... Hhhhhmmmmmmmm

The last 2 posts interest me. Where I am headed in this thought is why do some report 33mpg and others never see it on their best day. What is different? This sensor has popped into my head a s possible cause. Bob I think you ( or I ) have it bassackwards. Hotter air means less fuel needed for ignition. Leaner is hotter engine wise.

I may try moving ours for a while and see what (if any) effect it has. Ours has always been 6-10 degrees warmer than actual & our fuel economy has always lagged behind what most average. And since removing the Airbox & Resonator, we get some popping on decel & our fuel economy has lowered a bit more, hovering right around 24 mpg's for the average. Guess it can't hurt to try & if it provides negative results, I'll just put it back

 

[Magdave]

http://www.spyderlovers.com/forums/showthread.php?33555-Outside-Air-Temperature-Sensor


Old news, same subject. Post 13 and 17 speak to having moved the temprature probe.

Thanks for that one Bear answers some of my questions. :thumbup:

 

[Magdave]

The sensor need not be accurate, just repeatable.

That may also be true since the other sensors (O2,MAP) provide feed back too. But I wonder. In the Corvette world the IAT(idle air temp) sensor, which is what I equate this to, can cause all sorts of issues even if it is repeatable including changing the fuel mapping independently . Lets face it all sensors are not he same or perfect. There has to be some reason some people get over 30mpg while others do not. I lean more toward a non conforming sensor because a mechanical issue would eventually destroy the engine.

 

[Magdave]

Here is a link to EFI intake air temp effects on fuel mapping.
http://www.enginebasics.com/EFI Tuning/Air Intake Temp Tuning.html

 

[Bob Denman]

Dave :agree: hotter air is less dense; less fuel is needed...
If your sensor is reading high; that would normally be leaning out the mix a little bit...

 

[billybovine]

Keep in mind this is a dual sensor. Ambient Air Pressure and Temperature Sensor, AAPTS. If you want to start experimenting with changing it's location you will have to consider that it cannot be put in a high speed air stream. For example in the air intake. This will mess with its' ability to measure ambient air pressure.