Roush ECU Programming ?

[mln385]

Does anyone know if Roush reprograms the cooling fan to come on at an earlier temp than stock?

Just curious;
Marc

[DevilSun]

Cooling fan, as in the thermostat driven one? I may be off base, but isn't it completely driven by the thermostat, or am I thinking of the wrong fan?

[mln385]

Originally Posted by DevilSun

Cooling fan, as in the thermostat driven one? I may be off base, but isn't it completely driven by the thermostat, or am I thinking of the wrong fan?

How can it be driven by the thermostat?
My thoughts are it is turned on by the temperature sensor by a calculation in the ecu . However I could be wrong hence my question.

And yes D.S I am talking about the cooling fan for the radiator.

Marc

[roush2k]

The cooling fan is controlled by the PCM. It will turn the fan on when the temp gets to a certain point. I know this because when I had my custom chip burned, that was one thing I had changed.

As for the Roush burn, I am sure that is something they would change, but could not answer that with confidence. I do not know that for a fact.



ð kev

[U.S.BlueStage2]

I seem to remember reading something about 214 degrees being the temperature when the radiator fan turns on for a stock mustang, which, of course, has a 190 degree thermostat.



I know that the twin fans for my heat exchanger are controlled by the CPU, but they are not temperature triggered.

[DevilSun]

Originally Posted by U.S.BlueStage2

I seem to remember reading something about 214 degrees being the temperature when the radiator fan turns on for a stock mustang, which, of course, has a 190 degree thermostat.



I know that the twin fans for my heat exchanger are controlled by the CPU, but they are not temperature triggered.

I do believe the stock Mustang has a 210 degree thermostat, thus why people install 190 degree thermostat's as "aftermarket".

Of course, the PCM turns on the fan but that "switch" is thrown based off the thermostat saying "i'm open" + a few degress it seems. The reason I say this is I had a 190 degree therm installed (don't believe 190 is stock) and now my water temp gauge stays real close to 190 on my real gauge. Once it gets 4-5 degrees above that it seems to turn on the fan and then shuts off once it drops back to 190. It seems to be all revolving around the thermostat, that's all I was saying.

Logically, I'm confused how fans could NOT be temperature triggered. The only way that's NOT the case is if it has a constant algorithm, off for one minute after being on for two minutes. I don't think I've ever heard of that, just seems to defeat the purpose of the fan which would be to help pull extra air through to cool the system to a certain point (temperature) then shut off.

[mln385]

Well since the Roush S/c cars have a 180 degree thermostat I believe the roush ecu would change the temperature from which the fan turns on just curious as to what that would be.

We need a service manual for our cars that is what we need from roush.

Marc

[U.S.BlueStage2]

I personally changed my 190 degree thermostat (stock) to a 180 degree thermostat that I bought from Roush (which was stupid b/c it is just a Ford thermostat). The temperature mark is actually inscribed on the thermostat, i.e. 180.

So, I dont know about other 2002 GT's, but mine came stock w/ a 190 degree thermostat as indicated by the incription on the metal part.

My understanding of what is meant by a 180 degree thermostat is that once the temperature reaches 180 degrees the valve for the engine coolant is opened so now coolant is flowing through the engine. The fan does not immediately turn on at that temperature b/c there is no hot coolant running throught the radiator. And if you are cruising on the highway, the fan will not turn on at all at that temperature. It is only when a higher temperature is reached, around 210-214, that the fan is needed in addition to the coolant flow.

Once again, does not answer the question asked, but I would imagine that Roush must modify the trigger for the fan.

My heat exhanger fans go on at a certain time, and stay on.

My water temp gauge usually is right around 180, unless I am in stop and go traffic, and then it is up around 210.

[DevilSun]

Damn, got my numbers all mixed up I have no clue what is stock and what isn't anymore. All I know is my fan comes up sooner than 210, or at least what my temp gauge reports as 210, and it's directly connected to the coolant drain plug on the block, that's why I mentioned that it seemed to be tied into the thermostat.