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Ambient thermometer accuracy

4787 Views 35 Replies 20 Participants Last post by  SkooterG
I'm a bit mystified by what I'm seeing on my dash regarding ambient air temp ... it doesn't always seem to match what I would guess.
Where is the sensor for this unit... inside the fairing? and how accurate might it be?
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Temp sensor is right by the abs test connector. Seems accurate enough to me while riding.
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Yeah, nothing radical... I don't think mine is "defective" or anything; it's only that I've been surprised a number of times when I felt the air temp would have been significantly different. Yesterday I was up in northern Connecticut and I saw a reading of 97 at one point. It WAS an exceptionally warm day... but... ninety-seven?
I'll admit, that I don't pay a lot of attention to it unless it is under 40. Typically just looking for temp drops that indicate icing.
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If I’m remembering right from my own experience, I believe it’s consistently about 2 degrees hotter than standing outside away from a bike.
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You have to be moving for it to be reasonably accurate. Once you stop, the warm air rising off the engine affects the reading. The thread below titled "Picture Quiz" shows it very accurately.








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I noticed this awhile ago, seems to stay within a certain range. Figured it might have something to do with being under the fairing and engine heat etc.

And just like that - cue Russ! :D

I find my old Aerostich key ring hanging from my tankbag is more accurate.

Automotive lighting Data storage device Rectangle Font Computer data storage
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I'm just getting the popcorn ready. I'm curious of...

1) How many pages this develops
2) How many guys list "data points" from their experiences
3) How a body thermometer is more or less accurate from an FJR one
4) WGARA


:LOL:
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Boy does this bring some memories, years ago before I retired I worked in an engineering lab for one of the major oe brake suppliers and we had a great calibration lab where I learned that some things like thermometers/thermocouples are near impossible to calibrate exactly across their entire range. So they get calibrated at a set point and you compareacross multiples that rarely agree exactly.

So most measuring devices like this usually have a variance tolerance which on non-calibration pieces (not items that are used to calibrate) they have a variance tolerance of +/- 10% of its full scale versus a piece you calibrate to which has a accuracy tolerance of +/- 1% of full scale. Add In the actual engine heat from the motor rising up around the sensor as Russ said.

Also actual linerarity bears into it of each individual gauge so individual variances are not a surprise. Anyway the readout which also has accuracy tolerances on the FJR is really pretty good, surprisingly so.
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To summarize, the temperature accuracy is "good enough".

Remember the days when your bike didn't even have a fuel gauge, only a reserve lever that you hope you remembered to turn off the last time you ran the tank empty driving somewhere?
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And it only goes down to 16 deg F.
I found my '07's to be 1C above a Honda ST1300, and the '14's was closer. My Versys reads 2C higher than the '14 and is indeed wrong checked against thermometers I have here (at room temp).. Placement of the sensor is different on all these...... The ST's was right up front on the inner fender (great spot). Just "calibrate" to a good room temp themometer and note the offset.....
Hairstyle Sleeve Beard Yellow Baseball cap


Ok... It sounds like the gauge is reasonably accurate; I've just been surprised a few times to see readings that seem significantly different than my Seat-O-the-Pants gauge. As mentioned, a few days ago I was moving on a side road up in northern Connecticut and the gauge read 97... I'll have to check and see if the sensor is being blocked or impeded.
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[glitch 2!]
I think Bandit is trying to make a point! :ROFLMAO:
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oops... sorry! Some computer snafu going on over here... :confused:
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No worries!
I think the ambient thermometer on the several FJRs I own is very accurate. Perhaps not perfect, but pretty damned good. Especially while comparing those on other bikes while on a ride. Whether they be other FJRs or other brands.

I do however have one issue with the ambient thermometer: The sampling rate. It is slow to react. While riding through hot or cold pockets for a mile or two I can feel the temperature change drastically temporarily, but the ambient thermometer never changes.
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