Coolant sensor values for Megatherm needed

[Boris740]

My Megasquirt reports somewhat high coolant temperatures. I suspect that the three values that I fed to Megatherm were somewhat off. Does anybody have three accurate coolant sensor resistance values. My motor is 91 B230FT.

[kyle242gt]

I too await a response.

I don't have mine handy, Boris, I took some readings at 190F, 70F, and 0F (near boiling water, room temp, and freezer respectively :-D) and it took about six tries to get an .inc that wasn't all bogus inside.

\\edit2 - I got .465K = 190F, 3.5K = 70F, 12K = 0F Swedefiend, I'd love to hear the specs, be interesting to see if I'm even close.

[Boris740]

I too await a response.

I don't have mine handy, Boris, I took some readings at 190F, 70F, and 0F (near boiling water, room temp, and freezer respectively :-D) and it took about six tries to get an .inc that wasn't all bogus inside. I think the specs were something like 340K, 2.3M, 4.6M but I could be waaaaay wrong, that's from memory.

I'm using sensor #1 in this image: http://www.sonic.net/~kyle/242/show/sensors.jpg

Those values sound really high The upper leg of the voltage divider is only 2.49K The coolant sensor would look almost like an open circuit and would be putting out 5 volts due to dominant low value of the coolant bias resistor (R7) Anyone else please?

[swedefiend]

Sorry guys I am at school. I have the values from the Bentley manual. But not in front of me.

[coldfusion21]

i hate to say this, but try a search. i think the poi has posted them at one point.

Edit: here it is (http://www.forums.turbobricks.com/showthread.php?t=13325&highlight=easytherm)
post number 10

[swedefiend]

Kyle, these values look good:

3.5K = 70F, 12K = 0F

The other I am not sure about. The table I am looking at seems closer to 200 ohm at 190F.

[kyle242gt]

It was kinda dicey measuring at that temp, so I could well be wrong... keeping the sensor hot required holding it in the steam (ouch) and then it heatsoaked so the sensor itself was hottttt (ouch :freak: ) so the old post's values are much appreciated.
I used these three data points, straight from the Chilton's manual:
deg/resistance

-4/15000
104/1200
212/180

[volvorsport]

what about the air temp sender - i have a bosch one from motronic , or dont i need an INC file for air temp .

[kyle242gt]

As far as I know, we're all using the GM sensor that MS is pre-configured for. You'll need to get values if using a different sensor. Easy enough to do if you have a reliable thermometer and a DVOM...

If the values reported by MT are inaccurate, just tweak them up or down, write a new .inc with easytherm, and compile it with compile.bat. I find that wayyyyy easier than letting easytherm write the .s19.

[Magnum TE]

whats the bias resister value need to be in easy therm? for the volvo sensor. Its set to 2490ohm from the install, is that fine?

[swedefiend]

whats the bias resister value need to be in easy therm? for the volvo sensor. Its set to 2490ohm from the install, is that fine?

From what I have heard, you are not to mess with this value unless you are a rocket scientist ;-) (seriously)