Author Topic: Relocating the Ambient Temperature Sensor  (Read 374 times)

Offline Solo

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Relocating the Ambient Temperature Sensor
« on: November 12, 2017, 08:06:50 pm »
Has anyone tried to move the ambient air temperature sensor further from the engine?  The only time the temperature reading is accurate is when the engine is cold.  I have looked at the sensor, how it mounts and what is behind it.  It looks like the engineers didn't want us to move it.

Offline BigBob

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Relocating the Ambient Temperature Sensor
« Reply #1 on: November 12, 2017, 08:21:50 pm »
It is for the ECU and the gas/air mix. They let us see it but I would not move it.

My Honda truck has a +\- 10 degree setting. I would love to be able to say -4 on the temp DISPLAY.
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Offline Checkswrecks

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Re: Relocating the Ambient Temperature Sensor
« Reply #2 on: November 12, 2017, 09:48:47 pm »

 ::026::  to what BigBob wrote.

There are a number of threads about its being about 4-5 degrees high.
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Offline worncog

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Re: Relocating the Ambient Temperature Sensor
« Reply #3 on: November 12, 2017, 09:59:20 pm »
Technically it is measuring air box ingestion temperature, as ambient would be prior to entering the air train. If you really want ambient, add a thermometer to the dash fill panel.

If you move it, your fueling will be 'off'.

I added a thermometer to two of my machines. Now I know for sure if I'm frozen or well done.
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Offline OldRider

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Re: Relocating the Ambient Temperature Sensor
« Reply #4 on: November 13, 2017, 09:04:37 am »
I wonder why the display is even there. Looks to me to be useless information except it might give you a heads up that the air box was on fire.

Offline terrysig

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Re: Relocating the Ambient Temperature Sensor
« Reply #5 on: November 13, 2017, 10:28:06 am »
Good for rough guidance. as mentioned cold engine about right. hot in traffic not very good but once riding at a steady and consistent pace seems very good for a -4 to -5 bias as others have mentioned.

As cold weather approaches (now for me) is add it to the dash as a minder for the potential of back ice.

Offline Juan

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Re: Relocating the Ambient Temperature Sensor
« Reply #6 on: November 13, 2017, 10:41:42 am »
I wonder why the display is even there. Looks to me to be useless information except it might give you a heads up that the air box was on fire.

I use the display to ensure that I do not switch off the ignition before the temp. reaches 78c. This avoids the hard start problem (although the real cause of this problem has never been officially revealed) - but better safe than sorry.

Offline EricV

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Re: Relocating the Ambient Temperature Sensor
« Reply #7 on: November 13, 2017, 10:45:05 am »
Has anyone tried to move the ambient air temperature sensor further from the engine?  The only time the temperature reading is accurate is when the engine is cold.  I have looked at the sensor, how it mounts and what is behind it.  It looks like the engineers didn't want us to move it.
As others have said, it's not an ambient air temp sensor.  It's an intake air temp sensor for the ECU and Yamaha just tweaked the number in some simple way, (algorithm?), to provide a general ambient air temp reading.  The sensor is there for air/fuel ratio changes.  It was a cheap way to give you a "feature" that you didn't really need.

Sometimes it's even correct!  For me, usually around 74F it's spot on, but it varies from 68-76 where it happens to be right on.  Most of the time I joke with my wife that it's always warmer where the Super Ten is.  Her GSA has a more accurate temp reading because it has a separate temp sensor for ambient temp readings.

And what is your hoped for impact to your riding in having an accurate ambient temp reading?

Since it's Winter, I guess it's time to remind riders that you need to actually pay attention to conditions.  Is standing water frozen beside the road?  Is there heavy frost on the ground?  Remember all those signs that say bridges ice over first?  They aren't kidding.  That glare on the pavement in your headlights might not just be a different kind of paving, it might be ice.  Don't suddenly change anything, just stay in the same lane position and steady on the throttle and you'll go right over it and be fine.  Drop throttle, brake or try to change lane position and you might find yourself suddenly sliding.  Do you have an outside thermometer at the house?  Might want to check that before you head out so you have a clue about what temp you're starting out in.  When you come out from work to get on the bike, turn the key on and check the temp reading then, it's going to be accurate with a cold bike that's been sitting there for hours.  Once the bike fires up it will be warmer than actual pretty quickly.
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Offline RicoChet

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Re: Relocating the Ambient Temperature Sensor
« Reply #8 on: November 13, 2017, 10:54:52 am »
I use one of these in my cigarette lighter plug... It works great! Voltage, Temperature and Amps used while charing -- and it has a little antenna that you can move to get into the air and get good readings

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Offline mebgardner

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Re: Relocating the Ambient Temperature Sensor
« Reply #9 on: November 14, 2017, 10:42:16 am »
I use the display to ensure that I do not switch off the ignition before the temp. reaches 78c. This avoids the hard start problem (although the real cause of this problem has never been officially revealed) - but better safe than sorry.

This avoids the "hard start" issue? I did not know that...

Ummm, I hope you mean 78F.  78c is pretty toasty (... which is 172F).
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Offline Juan

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Re: Relocating the Ambient Temperature Sensor
« Reply #10 on: November 14, 2017, 11:13:44 am »
This avoids the "hard start" issue? I did not know that...

Ummm, I hope you mean 78F.  78c is pretty toasty (... which is 172F).

oops. Sorry -I meant engine temp at 78c to avoid hard start prob.

Offline EricV

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Re: Relocating the Ambient Temperature Sensor
« Reply #11 on: November 14, 2017, 11:45:16 am »
oops. Sorry -I meant engine temp at 78c to avoid hard start prob.

Actually, coolant temp.  And 78c is a good benchmark.  I typically use 160F coolant temp for the same reason, but we are in the same range.  I'm not sure how prone to the 'hard start' the Gen II bikes are, but on my Gen I, I was always careful that if I fired it up for a short period, to leave it running until reaching 160F or so on the coolant temp.  This just ensured that the cold start functions were fully over and avoided a possible over rich condition on the next start.
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