zane9000 Posted July 5, 2006 Share Posted July 5, 2006 I have a Taurus electic fan that I want to wire to my megasquirt. Im not using the fast idle circuit, so I was thinking that I could take teh FIdle output form the DB37 connector and run it to a normaly closed relay that would control the fan. That way I could set the FIdle in megatune to whatever temp I want the fan to turn on at. Will that work? Quote Link to comment Share on other sites More sharing options...
mobythevan Posted July 6, 2006 Share Posted July 6, 2006 The FIDLE output was intended to run a relay on the MS relay board, so why not use it for fan control, as long as MSnS_Extra allows you to select FIDLE output for fan control. What generally happens is that most people use the FIDLE pin for spark control, but otherwise that should work fine. Quote Link to comment Share on other sites More sharing options...
zane9000 Posted July 6, 2006 Author Share Posted July 6, 2006 Im using the MSII code, not MSnS_E. What I was thinking is that since the FIdle is a tepreature related on/off circuit anyway, I could just set the temp that the FIdle is supposed to turn off at for the temp I want to turn the fan on at. Ill let you guys know how it works, Ill be wiring it up later today to tomorrow. Quote Link to comment Share on other sites More sharing options...
mobythevan Posted July 6, 2006 Share Posted July 6, 2006 That may not work very good because you want hysteresis built into electric fan control(off to on and on to off temps to vary by a few degrees or more). The fan code for MSnS_Extra provides that hysteresis, otherwise you may have the issue of the relay kicking on/off spuratically when you cross the temp threshold and that will likely burn up your electric fan motor. I am only speaking from theory so you are welcome to try it and it might work. The FIDLE software didn't intend to pass the threshold more than once each time the engine was started and not in the reverse direction where the engine cooled down enough while running to require FIDLE to turn on again. Quote Link to comment Share on other sites More sharing options...
Clifton Posted July 6, 2006 Share Posted July 6, 2006 Apparently it's common to do on MSII. I've had this bookmarked to do mine when it cools down some here. It explains everything. http://www.msefi.com/viewtopic.php?t=16572&postdays=0&postorder=asc&highlight=fan&start=0 Quote Link to comment Share on other sites More sharing options...
zane9000 Posted July 6, 2006 Author Share Posted July 6, 2006 O man, that is great. Thanks alot guys! Quote Link to comment Share on other sites More sharing options...
mobythevan Posted July 6, 2006 Share Posted July 6, 2006 great link, and it address the hysteresis issue: That will turn the relay (assuming it is NO) on at 185, off at 180 (this keeps it from flickering on and off when you are near 185). You can change the threshold value to anything you like, of course. Quote Link to comment Share on other sites More sharing options...
zane9000 Posted July 7, 2006 Author Share Posted July 7, 2006 I just set it up from the instructions on the page that Clifton provided. It works great. Thanks alot for sharing that! Quote Link to comment Share on other sites More sharing options...
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