JohnRambo Posted December 28, 2015 Report Share Posted December 28, 2015 Merry xmas all i have a single 14" fan that runs off a 25a fuse and struggles with Auckland traffic. i want to switch to 2x12 and was thinking of a hi and low temp setup. However I want to avoid running another fuse and relay and using up 2 outputs.i would also like to wire up and auto/override witch for track days. any thoughts would be much appreciated Quote Link to comment Share on other sites More sharing options...
Davidv Posted December 30, 2015 Report Share Posted December 30, 2015 You could run one of the fans from a temp switch in the radiator, and then the other triggered by the ECU.Does your radiator have a fitting for a temp switch already?You can buy different ones which come on at different temps, depending on what thread pitch etc it is. Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted January 6, 2016 Author Report Share Posted January 6, 2016 Thanks. Prior to the link I had a fan controller which had a temp sensor in the top radiator hose which I could put back into service.does any have a recommended temp to have the second fan turn on?i have a skyline and might look to see if I can remove the fpcm on aux 3 which would give me a spare output to drive the second fan Quote Link to comment Share on other sites More sharing options...
Dave Kriedeman Posted January 6, 2016 Report Share Posted January 6, 2016 Hi JohnRambo,I would set the radiator top hose capillary tube thermatic fan switch to activate at 90 deg c.I would set the second fan to be activated via the relay from the ECU AUX O/P and also have it activate with the A/CON on so you have an A/CON condensor fan.Have you no spare AUX outputs including any spare injector or ignition outputs to drive the fans.RegardsDave. Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted January 10, 2016 Author Report Share Posted January 10, 2016 Thanks, I set the old fan controller to 90deg and the link to control the other fan at 96degI don't have a/c in my car and I used the original a/c aux for a shift light.I noticed on my link one of the aux was for a CE light which is only for map and ECT, could I use this aux for the second fan. I have a good water temp gauge. Quote Link to comment Share on other sites More sharing options...
Scott Posted January 11, 2016 Report Share Posted January 11, 2016 The CE output on the Link ECU will activate for any fault noticed by the ECU. It would be possible to use this output for controlling a second fan, but you would then not know if a fault had been noticed by the ECU.Which ECU do you have? Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted January 11, 2016 Author Report Share Posted January 11, 2016 I have a g4 gtslink.the current output is only for map and ect.i'm in the middle of setting it up so I can run a win tablet as the dash for the track, or maybe leave it permanently for the street, which would always have pclink running to show me any errors. I also rely on the engine limiting functions to protect it. Quote Link to comment Share on other sites More sharing options...
Scott Posted January 11, 2016 Report Share Posted January 11, 2016 It sounds like a good output to use then. Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted February 13, 2016 Author Report Share Posted February 13, 2016 I'm getting rid of a clutch fan on another Skyline and putting in 2x12' fans as well. This car has the a/c however, could I remove the stock condenser fan and just run the 2x12? would that be enough for the a/c?I think this is what DavidK was getting at. Just want to confirm it Quote Link to comment Share on other sites More sharing options...
Scott Posted February 15, 2016 Report Share Posted February 15, 2016 Hi John,This should work fine so long as you the ECU is switching on the A/C compressor clutch. I would set one of the fans to 'AirCon Fan', and then the other fan as a GP output that activates when the first fan activates. This way they will both come on when the ECT is high enough, and both come on when the A/C compressor clutch comes on. Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted February 15, 2016 Author Report Share Posted February 15, 2016 Ok, I had one fan as the aircon fan and the other as engine fan.So I need to change my engine fan to GP output with something like this virtual aux value1 = onset it to engine fan aux value1 = onset it to aux inj 8 (which is the aircon fan) Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted February 15, 2016 Author Report Share Posted February 15, 2016 that aux value1 should be aux fuel value1 Quote Link to comment Share on other sites More sharing options...
Scott Posted February 15, 2016 Report Share Posted February 15, 2016 (edited) I would set the fans up like this: When ECT is 96 C or higher OR AirCon Clutch is on, Aux 1 will turn on. When Aux 1 turns on, Aux 2 will turn on also. I'm unsure which Aux channels you are using, but you get the idea. Edited February 15, 2016 by Scott Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted February 15, 2016 Author Report Share Posted February 15, 2016 Perfect. Thanks Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted February 15, 2016 Author Report Share Posted February 15, 2016 Do you think I should put in a delay for the second fan to reduce the initial load on the electrical system? Quote Link to comment Share on other sites More sharing options...
Scott Posted February 16, 2016 Report Share Posted February 16, 2016 I would try it without and see if there is a problem. If there is then you could use one the ECU's timers to make this happen. You would make the timer activate when the 'AirCon Fan' aux channel turns on. Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted February 16, 2016 Author Report Share Posted February 16, 2016 I've tried this tonight and something fully strange is going on.It is a GTSLink and I set Aux 2 to be the aircon fan. I ran the test and it was ok. However, when I turned the car off it must switch to ground and the fan started to run when the car is off.It doesn't do this on Aux Inj 8 though, I tested with Aux 2 and Aux 1. Quote Link to comment Share on other sites More sharing options...
Simon Posted February 16, 2016 Report Share Posted February 16, 2016 You need to make sure the power to the fan is removed when the key is turned off.What you are seeing is a typical back feed. The ECU has no control over the drive once it is turned off the internal circuitry has a path to ground which will then allow the fan to run.If you hed toNavigation: G4+ ECU Tuning Functions > Auxiliary Outputs >Wiring Auxiliary Outputs In the help file it gives a much longer explanation. Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted February 16, 2016 Author Report Share Posted February 16, 2016 Fresh cup of coffee and the light bulb turned on, my fans are run directly from the battery like the fuel pump so it has a constant 12v.If I put the fans on ign 12v it will sort it. Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted February 16, 2016 Author Report Share Posted February 16, 2016 I've rtfm, will buy a relay today and put it between the battery and fans and make that relay ign switched.What would be a nice label to call these relays? Quote Link to comment Share on other sites More sharing options...
Scott Posted February 17, 2016 Report Share Posted February 17, 2016 The ignition switched relay will work well. You mean a label of the Aux Outputs in PCLink? 'Engine and A/C Fan 1' and 'Engine and A/C Fan 2' would fit in the space allowed. Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted February 17, 2016 Author Report Share Posted February 17, 2016 Just had a thought, could I just put a diode in the wire by the ecu to stop it back feeding? Quote Link to comment Share on other sites More sharing options...
Scott Posted February 17, 2016 Report Share Posted February 17, 2016 You are going to need to control the fans via relays regardless, and you should be able to find an ignition switched +12v pretty easy, so I would go that way if I was you. Quote Link to comment Share on other sites More sharing options...
JohnRambo Posted February 17, 2016 Author Report Share Posted February 17, 2016 Given it is 2 fans, am I best to run 2x ign switch relays in front of the 2x fan relays? So 1 relay per circuit.Just thinking out loud and trying to keep it simple. Quote Link to comment Share on other sites More sharing options...
Scott Posted February 17, 2016 Report Share Posted February 17, 2016 I would use two relays. On each relay:Pin 87 would go out to the fan (supplying +12V)Pin 30 would go to a battery power supply (fused).Pin 86 would go to an ignition switched power supply (fused)Pin 85 would go to the ECU's Aux Output channel. Quote Link to comment Share on other sites More sharing options...
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