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ECUflash Fan Temp Controls

Posted by 99OZDSM, Aug 15, 2019

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  1. 99OZDSM

    99OZDSM Proven Member

    Joined Jun 16, 2007
    Virginia Beach, Virginia
    I've been thinking about ways to increase the overall thermal efficiency of my cooling system. I understand ducting will reap the largest benefits, which is a project I am planning later on. Along with an Andrew Brilliant designed vented hood from Carbonetics.

    I was wondering if lowering the temperature that the main fan turns on would be worth it? Below is a snapshot of my options in ECUFlash/Ceddymods. It looks like the main fan turns on at 204.8 F and has a "high setting" that turns on at 212 F. Am I reading this chart right? What does High Off mean?

    Would it the be beneficial to adjust my AC Fan temps lower so that I have two fans on at say, 204.8 F?

    What does everyone else do? My car is a street/autox build for reference. FanTempControl.PNG

    2K  6

    1998 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM
  2. Mello

    Mello Proven Member

    Joined Jul 4, 2003
    Albuquerque, New Mexico
    Our motors are designed to run around 200²F±10²F. Unless you're have high temp problems I would leave the ECU setting like they are. The AB hood will increase the pressure differential across the radiator making it work more efficiently.
    ThunderChild likes this.
  3. stillrunning

    stillrunning Proven Member

    Joined Oct 10, 2013
    brandon, Florida
    Do you have a cooling issue.
    High Off is the temperature that High mode will stop.
    The engine temp is largely controlled by the coolant thermostat, if you have a lower temp thermostat you would then consider lowering the fan on/off temps.
    And if I'm not mistake with ECUFlash you want to make sure your engine gets up to 180+ for LTFT control to function, if that matters to you.

    Street Build 419  3

    1997 Mitsubishi Eclipse Spyder GST
    fwd · manual · 2G DSM

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