Did you find those documented somewhere? I could have sworn that I correlated the bars and the OBD output differently. Sure I saw four bars sooner than that. (before 220.. the thermostat is fully open at 194F). I would guess that 4 bars is 100C (212F), and another bar is added for each 10C (so 4 bars to seven bars would go 212F, 230F, 248F, 266F).

 

These are the #'s from Modifry's ECT module directions, using OBDII ouput and heating the ECT sensor in a pot of oil.

http://baustnet.com/honda/mods/ect/ECT%20I...nstructions.pdf

 

Modifry is a smart guy but his testing may not perfectly simulate what happens in the car. I found mine by running reduced coolant and watching the gauge and the OBD read-out for 4 and 5 bars. I did have to estimate as timing is not exact, but since it is a Japanese device and everything else is programmed in celsius, it would be logical that the bars are celsius increments. (IMO 235F is a little high for 4 bars as the thermostat fully opened at 194F and the fan turned on at 196F so you would expect the engineers would alert the driver sooner).

 

The stock gauge has a approx. 10 second delay before lighting the next bar. The gauge is driven by a digital signal from the PCM. The temp 10 seconds before the bar lit is the threshold temp for the next bar.

 

That has nothing to do with what the increments are.. I am just saying it was likely spec'd in celsius so don't get too enamored with the odd increments that came out of his testing.. even celsius increments are a more logical guess. My observations in an actual running car with accurate equipment are different than the pot of oil experiment.. neither is a factory quoted fact so lets be careful presenting the numbers as anything more than an estimate from a single observation.

 

The 3rd bar covers the most common temp ranges, 160-235. They do this so the gauge isn't always moving. It's been proven the gauge doens't have the same temperture range between bars.

Modifry and others have put considerable time backwards engineering the temp guage. I'd trust his real #'s on a actual car before assuming the guage is calibrated in celcius.

 

Huh? My estimates were made using an actual car and logical celsius increments where the others are a pot of oil and some strange increments. The Japanese do temperature in Celsius, not Fahrenheit.

As I see it 3 bars come on at 75C (167F), 4 bars 25C later at 100C (212F), 5 bars 10C later at 110C (230F), 6 bars 10C later at 120C (248F), and 7 bars 10C later at 130F (266F).

What you are quoting is 3 bars at 71.11C (160F), 4 bars 41.69C later at 112.8C (235F), 5 bars 6.1C later at 118.9C (246F), 6 bars 8.3C later at 127.2C (261F), and 7 bars 6.7C later at 133.0 (273F).

You can believe whatever you want but I contend that my observations and estimates make a lot more sense.

 

Modifry's measurements where done monitoring OBDII reported temps, just like yours.

The only difference was he didn't run his car hot to do so.

How is fahrenheit a strange increment? Most people in the USA understand Fahrenheit. If I put the temps in Celcius, most people would have to convert to put the temps into a perspective they more easily understand.

 

can you run your heater in situations like this to reduce the temp?

 

[QUOTE=Slows2k,Jun 6 2005, 09:59 PM] How is fahrenheit a strange increment?