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Old 10-22-2011, 12:42 AM   #1
Kabigon
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The temperature gauge lies...

...but you probably knew that already.

Did you ever wonder why the temperature gauge gets to the halfway mark so quickly after you start the engine?

The gauge will hit the halfway mark with a coolant temp. of ~50C (122F). As the coolant temp. increases to normal operating temp. (~200F), the gauge won't move.

I don't know what the coolant temp. would have to be for the gauge to read significantly higher, but I imagine that it would start going up quickly when the coolant temp. gets above 210F or so.

The bottom line is that the temperature gauge is highly non-linear by design.


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Old 10-22-2011, 05:09 AM   #2
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Hi, the bottom line is that most people don't look at the temp gauge and many cars don't have one anymore, just a blue light when it is cold and a red one when it is up to temp. I guess, though, if something is fitted it should work, more or less, as it should, maybe the gauge is just there to indicate that the engine temp is working within its designed parameters.
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Old 10-22-2011, 05:11 AM   #3
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It's more likely a CHT sensor (cylinder head temp) only the SVT as a real water temp sensor from what I understand or can see. CHT is different than actual water temp, that's why I installed a water temp gauge in my gauge pod.
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Old 10-22-2011, 10:08 AM   #4
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I noticed that!
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Old 10-22-2011, 10:15 AM   #5
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as long as it doesnt go over half im okay!
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Old 10-22-2011, 11:18 AM   #6
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Quote:
Originally Posted by Kabigon View Post
...but you probably knew that already.

Did you ever wonder why the temperature gauge gets to the halfway mark so quickly after you start the engine?

The gauge will hit the halfway mark with a coolant temp. of ~50C (122F). As the coolant temp. increases to normal operating temp. (~200F), the gauge won't move.

I don't know what the coolant temp. would have to be for the gauge to read significantly higher, but I imagine that it would start going up quickly when the coolant temp. gets above 210F or so.

The bottom line is that the temperature gauge is highly non-linear by design.
I posted in another thread about how darn quick the car seems to warm up. How do you know it's playing games with the actual temperature, i.e., not moving after 122F?
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Old 10-22-2011, 11:23 AM   #7
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The car was designed to warm up quickly. If your car has the Kysor shutters, it should be closed automatically to aid in the warm up process. The reason is for the engine to operate as efficiently as possible, as well as to reduce emissions. Also, a side benefit is that the heat should come on quicker.
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Old 10-22-2011, 03:10 PM   #8
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Quote:
Originally Posted by danyall2010 View Post
The car was designed to warm up quickly. If your car has the Kysor shutters, it should be closed automatically to aid in the warm up process. The reason is for the engine to operate as efficiently as possible, as well as to reduce emissions. Also, a side benefit is that the heat should come on quicker.
Yes. And, it does!
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Old 10-22-2011, 03:25 PM   #9
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If you put your car in test mode,You can watch the warmup on the digital display.
You could take a video and work out the rate of change in temperature.(Data Log)
The ones without K shutters, like mine, warm up super fast as well.
The Mixture is super rich on startup and the idle is also fast for about a minute or 2.
The Kat needs to warm up quickly for emmisions control.
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Old 10-22-2011, 03:33 PM   #10
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Quote:
Originally Posted by dasilvarsa View Post
If you put your car in test mode,You can watch the warmup on the digital display.
You could take a video and work out the rate of change in temperature.(Data Log)
The ones without K shutters, like mine, warm up super fast as well.
The Mixture is super rich on startup and the idle is also fast for about a minute or 2.
The Kat needs to warm up quickly for emmisions control.
Yeah, I was going to say something similar about the test mode temperature gauge.
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