I asked you guys this a while back wanting to know what the stock guage equated to. Well I know now, via my trusty bio therm I bought.

C is about 150
The first line after the C is 180
185 is a little past it.

Now heres the shocker... 195 is almost 1/2 way... Theres a big difference in the C to mid line on the guage...

BTW: The bio therm also confirmed ythat the haltech is 100% accurate...

 

thats scary. 150 = first line to 1/8th of the gauge in mine.

 

Gauge needle movement isn't always going to be linear, and it is responding to a thermocouple that may or may not be accurate due to its age, design, and manufacture.

Here's where the eningeer in me is screaming out though: I don't care what anyone says, there is no such thing as a 100% accurate gage. I want to see the calibration curves for it. I want to see it calibrated at known standards (Distilled icewater and boiling water baths, corrected for atmospheric pressure, dew point and global latitude).

Here's the thing though. If the gage is reading 195 at the midline, that either tells me that the thermal sensor is either poorly located, or not directly reading the coolant temperature. I would want it to read teh maximum temperature that the coolant is at. Here's why:

My car reads a bit low of 1/2 during its hottest driving, stop and go traffic. The antifreeze in the coolant raises the boiling point of the coolant, and the pressurization of the cooling system (to a max of 13 psig) also raises the coolant's boiling point. Boiling of distilled water at standard atmospheric conditions is 212 F. Under pressure and with antifreeze its what, close to 220-225 degrees F?

Is the temperature sensor reading the oil temperature? Or is it reading the temperature of the water after its been cooled? If so, then its believable I reckon. But I was under the impression that the temperature sensor was at the bottom of my radiator, and the low coolant sensor was the one at the top? Or Visa Versa?

 

I never understood why your runs so cool, I checked my vert after a hard 10 mile drive and it was 190 degrees

 

No its not reading the oil temp, the coolant temp sensor for the guage is mounted next to the oil pressure sender on the drivers side of the block.

The haltech reads directly off its sensor below the thermostat, so It sees true temp regardless of where the thermostat is.

 

HOW TO LINIEARIZE YOUR STOCK TEMP GAUGE

Click SAVE-AS, - it's a PDF File on a slowwww site.