Fan an temp question
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Instructor
Joined: Oct 2006
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From: Tempe Arizona
Fan an temp question
I have a tune which has the fan on at 180. Is there a speed at which the fan comes on at anything over 180? If I'm going 50MPH is the fan on at anything over 180? Can the speed be set as to when it commes on?
Drifting
Joined: Apr 2006
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From: Ambler Pa.
The fan has little to no effect at speeds above 35 mph. Most tuners say fan will run continuously if programmed lower than 192* @ more than 20% . Above 192* you can set your fan speeds as you like .
Drifting
Joined: Jun 2005
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Did you change thermostats to go with that fan change?
The thermostat and fan setpoints go together. Given plenty of airflow the car will run toward the middle of the thermostat's control range, typically about 15 degrees above the nominal opening temperature. There's no point in turning the fans on below the middle of the thermostat control range, and usually you'd use a value toward the upper end of that range.
So with the stock 180 thermostat, the car will run around 195 with plenty of airflow, and the fans should start coming on there or a bit above that.
With a 160 thermostat you'd expect operating temperatures around 175, and would set the fans to start coming on there or a little above, say around 180 degrees.
The thermostat and fan setpoints go together. Given plenty of airflow the car will run toward the middle of the thermostat's control range, typically about 15 degrees above the nominal opening temperature. There's no point in turning the fans on below the middle of the thermostat control range, and usually you'd use a value toward the upper end of that range.
So with the stock 180 thermostat, the car will run around 195 with plenty of airflow, and the fans should start coming on there or a bit above that.
With a 160 thermostat you'd expect operating temperatures around 175, and would set the fans to start coming on there or a little above, say around 180 degrees.
Thread Starter
Instructor
Joined: Oct 2006
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From: Tempe Arizona
I have a stock thermostat.
Just so I get this right. Your speed has nothing to do with the Fan running or not. Its total controlled by the temperature of the coolant. There are no settings that would control the fan not running at lets say speeds above 55MPH. I would think the fan would have little impact on cooling after you reach a certain speed.
Just so I get this right. Your speed has nothing to do with the Fan running or not. Its total controlled by the temperature of the coolant. There are no settings that would control the fan not running at lets say speeds above 55MPH. I would think the fan would have little impact on cooling after you reach a certain speed.
Drifting
Joined: Jun 2005
Posts: 1,837
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I have a stock thermostat.
Just so I get this right. Your speed has nothing to do with the Fan running or not. Its total controlled by the temperature of the coolant. There are no settings that would control the fan not running at lets say speeds above 55MPH. I would think the fan would have little impact on cooling after you reach a certain speed.
Just so I get this right. Your speed has nothing to do with the Fan running or not. Its total controlled by the temperature of the coolant. There are no settings that would control the fan not running at lets say speeds above 55MPH. I would think the fan would have little impact on cooling after you reach a certain speed.
The thermostat and fan work together, and that's why it makes sense to change them both.
In the stock configuration, the car will run around 195 when moving (controlled by the thermostat), and heat up to 210 or so when stopped for a while (controlled by the fan).
If you put in a 160 thermostat without changing the fan settings the car will run cooler when moving - around 175 or so, but heat up when standing still - eventually to the same 210 or so.
If you change the fan settings the but not the thermostat the car will still run around 195, and won't heat up much while stopped. But the fan will run all the time (once its warmed up).
If you change both, you'll run cooler (around 175 or so) while driving and heat up less (to around 200 or so) when stopped.
P.S. The fan cut-on temperature and rate probably change a bit depending on if the air conditioner is on or not.
