Can a Custom Tune determine when your fan activates? - Ford Powerstroke Diesel Forum
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Old 07-07-2010, 11:24 PM
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Can a Custom Tune determine when your fan activates?

I noticed that when my Xtreme race tune is loaded, my fan doesnt fully activate till i see temps of 220 maybe a little less, but with the stock tune it turns on at about 210 or less, But another crazy thing is when i run my AC in 100 degree weather, my truck runs cooler! Through my dashdaq i see that my fan rpms climb sooner thus cooling my truck down. So my question is, can a custom tune make the fan clutch look up earlier, especialy in this hot a$$ weather?
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Old 07-07-2010, 11:37 PM
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my fan always kicks on at 220....thats in exteme race and tow mode... not sure on stock.. since i havent ran it stock in a year
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Old 07-08-2010, 03:02 AM
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Not really an answer to your question but.... Take your pick: stock, extreme street, 60hp tow tune, my fan turns approx. 400-450 RPM till the coolant temp hits 219/220, then locks up fully till the temp is back down to 215.
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Old 07-08-2010, 04:04 AM
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I dont know if that can be changed in the tune. But theres a pile of different variables that determine when the fan kicks in. ECT isnt the only thing that activates it.
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Old 07-08-2010, 10:00 AM
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In stock mode the fan rpms will hover aroun 400 rpms, when i turn the ac or heater on the rpms bump up to about 700 to 1000 rpms. But with the xtreme tune my fan wouldn kick on even with the ac or heater on. Its just scary seeing that high of temperatures and 100 degree weather doesnt help much either.
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Old 07-08-2010, 10:17 AM
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I was under the impression that the fan kicked on based on oil temp not coolant temp... It also defuels and goes into limp based on oil temps... The coolant and oil temps are tied together thru the oil cooler. Never heard a actual yes or no. Untill the newest flash which will start to defuel and go to limp when the temp differential is over 25* this is the only thing that would cause the truck to lower power to self protect.
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Old 07-08-2010, 06:18 PM
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Quote:
Originally Posted by Lubbockguy1979 View Post
I was under the impression that the fan kicked on based on oil temp not coolant temp... It also defuels and goes into limp based on oil temps... The coolant and oil temps are tied together thru the oil cooler. Never heard a actual yes or no. Untill the newest flash which will start to defuel and go to limp when the temp differential is over 25* this is the only thing that would cause the truck to lower power to self protect.
You may seen this before but it's a copy/paste of a post Bismic has made a few times:
This is a post from Bismic that I saved a while back. I hope it helps with your question.

As for the "Factory" transmission temp gauge, it is a glorified "idiot" light as its response is severely dampened. The panel gage will show the temp as fully warmed up at 50 *F. Between 100-220*F the needle will remain in the same position on the gauge. At 230*F it will move up slightly to the middle of the normal range. At 250*F it will move to Yellow. The gauge moves to red at 280*F. This is supported on page 36 of the OBDII Theory and Operations manual. The tow/haul light will flash at 275*F.
Over 220*F is really too hot for continuous service - most likely something is not right when you see temps continuously this high. Never exceed 250*F for more than 30 minutes. The fluid can get to 300*F for a SHORT time w/o any damage (however a measured temp of 250*F could actually mean that some areas and parts may already be as high as 300).

Engine temperature is not the only parameter that the PCM monitors to determine cooling fan operation. This is the reason that you will see some variation in engine temperature as it correlates to fan operation. The operation/description of the FSS (Fan Speed Sensor) from the PC/ED manual has a fairly good explanation as to how the system "thinks". This is not your traditional engine hits temp X and the fan clutch locks up. The fan speed sensor is a Hall-Effect sensor integral to the vistronic drive fan (VDF). The powertrain control module (PCM) will monitor sensor inputs and control the VDF speed based upon engine coolant temperature (ECT), transmission fluid temperature (TFT) and intake air temperature (IAT) requirements. When an increase in fan speed for vehicle cooling is requested, the PCM will monitor the FSS signal and output the required pulse width modulated (PWM) signal to a fluid port valve within the VDF. Engine begins to defuel at 221*F. The thermostat begins to open at about 190*F to 195*F and is not fully open until about 215*F to 219*F.

STOCK READINGS:
............................Normal...........Sever e Service........Alarm
Tranny Temp........150 - 195.............195 - 200.............220
Coolant Temp.......190 - 195..............195 - 210............215
Fuel Press..............60 - 50.................50 - 45..............45
EGT - pre Turbo......650 - 1200.........1200 - 1250.........1300
EGT - post Turbo.......700.....................900........... ....1000
Boost.....................0 - 26.................27 - 28...............28
Oil Temp................200 - 220............220 - 235............235


And after all that I have some other numbers my tech who was vainly trying to trouble shoot some bizarre cooling issues I am having, direct from a request he made to the Ford hotline: "The PCM will start pulling back fuel and cut the AC when the ECT reaches 238 deg. and/or the EOT reaches 258 deg. You are not at the point also with the latest calibration if there is more than a 15 deg. difference between ECT/EOT the PCM will turn on the wrench light and flag a p012f code. This will also reduce your power." Those numbers darned high to me
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Old 07-08-2010, 07:54 PM
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Thats some awsome info there, anyone know when the stock eng temp guage moves, mine has never went hot before a month ago when i had to pull the 40ft toyhauler 5er from New Mex to Las vegas in 100 heat, the eng temp gauge moved that day! twice it climbed up to the Hot mark pulling hills, before that trip it had never moved..... eng temps, not tranny temps im talking
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Old 07-09-2010, 08:19 AM
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Great post. I probably skimmed that a few times in the past just didn't pertain to what I was looking for. Mark (bismic) is a great asset to this and every other forum he posts in. As for the factory gauges the only semi dependable ones are the spedo (mine is off 1-2mph with stock tires. Rpm, and fuel gauge. The none of them have actual hash marks with temps and in my opionion should be with caution. The typically let you know there is a issue after it is to late.
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