Questions about EEC Fan Control

Vehicle specific forum for tuning the Foxbody Chassis Mustangs utilizing the LUX0, GUFA, GUFB, and GUF1 Strategy

Questions about EEC Fan Control

Unread postby NIKwoaC » Sat Apr 14, 2018 10:43 am

I'm gearing up to run my electric fan off the EEC and I had a couple questions about wiring. Sorry if this has been covered before- I tried to search but was coming up empty.

The fan control (I'm only looking at high speed control) article on here shows relay coil power coming from ECU pin 37. Is this necessary? I was planning on running this power from one of the fuse box switched power sources (the same source I'll be running a couple of aftermarket gauges from).

Also, the article mentions that the maximum ECU pin amperage is 200 mA, with "much less for sustained use". Doing a little math, if I have an actual Vin of 14 volts, and my relay coil resistance is 80 ohms, then my constant fan running amperage is 175 mA. Is this too much? Should I consider adding a resistor? Is there any sense in trying to fuse-protect this circuit? Am I overthinking this? :D
NIKwoaC
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Vehicle Information: 1986 Mustang GT
Stock rebuilt 5L shortblock with Twisted Wedge 205 heads, Trick Flow R intake (long runner), 90mm TB, custom cam. ~ 9.8:1 CR, 42 lb injectors, 97mm Abaco MAF, Astro built "Cobra spec" T5, shorties with full 2.5" exhaust, Half ass self tuned with BE/EA and a Quarterhorse on an A9L with an A9L2-based tune. 336.3 HP @ 6050 RPM, 323.9 ft-lb @ 4700 RPM

Re: Questions about EEC Fan Control

Unread postby decipha » Sun Apr 15, 2018 7:09 pm

you can run it from any power source

the coil trigger is fine, i always recommend running two relays in parallel as well for fans
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91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
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Re: Questions about EEC Fan Control

Unread postby NIKwoaC » Thu Apr 26, 2018 7:28 am

Thanks, Decipha. I think I've seen you mention the dual relay thing before, but what's the purpose of 2 relays? My fan is a Flex-A-Lite 185, which is advertised as using 18A. I am running it with a 30A relay and 30A fuse. My diagram is attached. Thoughts?

E-Fan and Gauge Wiring.jpg
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NIKwoaC
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Posts: 18
Joined: Tue Aug 04, 2015 6:58 pm
Name: Nik
Vehicle Information: 1986 Mustang GT
Stock rebuilt 5L shortblock with Twisted Wedge 205 heads, Trick Flow R intake (long runner), 90mm TB, custom cam. ~ 9.8:1 CR, 42 lb injectors, 97mm Abaco MAF, Astro built "Cobra spec" T5, shorties with full 2.5" exhaust, Half ass self tuned with BE/EA and a Quarterhorse on an A9L with an A9L2-based tune. 336.3 HP @ 6050 RPM, 323.9 ft-lb @ 4700 RPM

Re: Questions about EEC Fan Control

Unread postby decipha » Thu Apr 26, 2018 9:38 am

due to the loading, most people with single relays eventually have failures either wires melting or relays burning up etc.. in any case they eventually have a fault. Just about every single relay setup Ive seen has failed at one point on the several hundred Ive seen.

On the dual relay setup I have yet to see one ever fail.
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90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Questions about EEC Fan Control

Unread postby NIKwoaC » Thu Apr 26, 2018 11:52 am

OK, cool, thanks. Do you also run the relay trigger wire(s) in parallel? Won't that put that circuit amperage over 200mA?
NIKwoaC
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Posts: 18
Joined: Tue Aug 04, 2015 6:58 pm
Name: Nik
Vehicle Information: 1986 Mustang GT
Stock rebuilt 5L shortblock with Twisted Wedge 205 heads, Trick Flow R intake (long runner), 90mm TB, custom cam. ~ 9.8:1 CR, 42 lb injectors, 97mm Abaco MAF, Astro built "Cobra spec" T5, shorties with full 2.5" exhaust, Half ass self tuned with BE/EA and a Quarterhorse on an A9L with an A9L2-based tune. 336.3 HP @ 6050 RPM, 323.9 ft-lb @ 4700 RPM

Re: Questions about EEC Fan Control

Unread postby decipha » Thu Apr 26, 2018 11:57 am

minimally, its usually a small spike at initial trigger then it drops a bit after the coil saturates. I personally have yet to have any problems doing so. If you do please do let me know but you should be fine.
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Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Questions about EEC Fan Control

Unread postby NIKwoaC » Fri May 04, 2018 6:55 am

OK, I have everything finished/wired up. Couple more questions:

1. Does the engine need to be running for the fan control to work? This is the impression I am getting. I loaded in a tune with the fan "on" temp set to 20 degrees below ambient and with KOEO I got nothing. Relay trigger is getting 12V as measured with DMM. I haven't tried with engine running yet because the car is still in a state of disassembly and on jack stands.

2. Does the PID VHFNTM actually do anything? My definition file indicates that it is the number of seconds to depress the throttle in KOEO to test the fan operation. Again, I tried this and got nothing.

Thanks!
NIKwoaC
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Posts: 18
Joined: Tue Aug 04, 2015 6:58 pm
Name: Nik
Vehicle Information: 1986 Mustang GT
Stock rebuilt 5L shortblock with Twisted Wedge 205 heads, Trick Flow R intake (long runner), 90mm TB, custom cam. ~ 9.8:1 CR, 42 lb injectors, 97mm Abaco MAF, Astro built "Cobra spec" T5, shorties with full 2.5" exhaust, Half ass self tuned with BE/EA and a Quarterhorse on an A9L with an A9L2-based tune. 336.3 HP @ 6050 RPM, 323.9 ft-lb @ 4700 RPM

Re: Questions about EEC Fan Control

Unread postby decipha » Fri May 04, 2018 2:42 pm

yes

im not familiar with that parameter off the top of my head

koeo test shud turn the fan on
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decipha
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Posts: 15311
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Questions about EEC Fan Control

Unread postby NIKwoaC » Thu May 10, 2018 9:42 am

OK, I got everything put back together and had a chance to test run the car and it seems to work beautifully. The only oddity is that the fan kicks on at 194 degrees F and shuts off at 184, even though I have the high speed on temp (HSFEC2) set to 204 and the hysteresis at 4. Any ideas?
NIKwoaC
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Posts: 18
Joined: Tue Aug 04, 2015 6:58 pm
Name: Nik
Vehicle Information: 1986 Mustang GT
Stock rebuilt 5L shortblock with Twisted Wedge 205 heads, Trick Flow R intake (long runner), 90mm TB, custom cam. ~ 9.8:1 CR, 42 lb injectors, 97mm Abaco MAF, Astro built "Cobra spec" T5, shorties with full 2.5" exhaust, Half ass self tuned with BE/EA and a Quarterhorse on an A9L with an A9L2-based tune. 336.3 HP @ 6050 RPM, 323.9 ft-lb @ 4700 RPM

Re: Questions about EEC Fan Control

Unread postby decipha » Thu May 10, 2018 10:50 am

that's odd, I see you have BE listed in your profile, your not using the a9l2 tune are you? You shouldn't be but if so, I rewrote the low speed fan controls to turn on the high speed fan pin so the ecu will turn on the fan when the a/c is turned on which doesn't happen when the high speed controls are used.
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decipha
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Posts: 15311
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Questions about EEC Fan Control

Unread postby NIKwoaC » Thu May 10, 2018 11:02 am

Haha heck yes I'm using the A9L2. Remember, it was your overheat protection in the A9L2 that saved my butt last year when my fan pooped the bed.

I don't know if this matters, but my car was originally an A/C car, but the A/C hardware has been removed. A/C wiring is still all intact, but I'm pretty sure I had all the HVAC controls off while testing the fan yesterday.

BTW, if you have anything I can "buy", let me know. I feel like I owe you some business after all the help you and your website has been for me over the years.
NIKwoaC
General Poster
 
Posts: 18
Joined: Tue Aug 04, 2015 6:58 pm
Name: Nik
Vehicle Information: 1986 Mustang GT
Stock rebuilt 5L shortblock with Twisted Wedge 205 heads, Trick Flow R intake (long runner), 90mm TB, custom cam. ~ 9.8:1 CR, 42 lb injectors, 97mm Abaco MAF, Astro built "Cobra spec" T5, shorties with full 2.5" exhaust, Half ass self tuned with BE/EA and a Quarterhorse on an A9L with an A9L2-based tune. 336.3 HP @ 6050 RPM, 323.9 ft-lb @ 4700 RPM

Re: Questions about EEC Fan Control

Unread postby NIKwoaC » Thu May 10, 2018 1:56 pm

OK, so, I just noticed that your A9L2 writeup says that it's not recommended to use the A9L2 with anything but TunerPro. I know I've been running an A9L2-based tune since at least 2015 (probably even before that) with BE with fairly decent results...
NIKwoaC
General Poster
 
Posts: 18
Joined: Tue Aug 04, 2015 6:58 pm
Name: Nik
Vehicle Information: 1986 Mustang GT
Stock rebuilt 5L shortblock with Twisted Wedge 205 heads, Trick Flow R intake (long runner), 90mm TB, custom cam. ~ 9.8:1 CR, 42 lb injectors, 97mm Abaco MAF, Astro built "Cobra spec" T5, shorties with full 2.5" exhaust, Half ass self tuned with BE/EA and a Quarterhorse on an A9L with an A9L2-based tune. 336.3 HP @ 6050 RPM, 323.9 ft-lb @ 4700 RPM

Re: Questions about EEC Fan Control

Unread postby decipha » Thu May 10, 2018 3:28 pm

ah yes i remember that thread

nope nothing to buy

reason being is that i changed a bunch of the code in the a9l2 so i renamed it gufx. In BE using the GUFB strategy some of the things shown will not be correct. Tunerpro allows dynamic binary arithmetic so it can correctly follow code patches to easily see if your looking in something that's disabled outdated or moved.
User avatar
decipha
Tooner
 
Posts: 15311
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Questions about EEC Fan Control

Unread postby NIKwoaC » Thu May 10, 2018 7:59 pm

So could this temperature discrepancy be due to the fact that I'm running an A9L2 variant in BE?

Other than you/here, does Tuner Pro have a good community and tech support? Clint has been very responsive and super helpful over the years, so I am hesitant to abandon BE... BUT I've also been very pleased running A9L2.
NIKwoaC
General Poster
 
Posts: 18
Joined: Tue Aug 04, 2015 6:58 pm
Name: Nik
Vehicle Information: 1986 Mustang GT
Stock rebuilt 5L shortblock with Twisted Wedge 205 heads, Trick Flow R intake (long runner), 90mm TB, custom cam. ~ 9.8:1 CR, 42 lb injectors, 97mm Abaco MAF, Astro built "Cobra spec" T5, shorties with full 2.5" exhaust, Half ass self tuned with BE/EA and a Quarterhorse on an A9L with an A9L2-based tune. 336.3 HP @ 6050 RPM, 323.9 ft-lb @ 4700 RPM

Re: Questions about EEC Fan Control

Unread postby decipha » Fri May 11, 2018 7:10 am

most likely its just the low speed fan settings you need to change, thats probably what its using to turn them on and off

tunerpro has been around a lot longer than BE and supports every make and model vehicle out there in one form or another. TunerPro has a significantly larger user base.

No need to abandon BE if you like it stick with it all that matters is whats easiest for you. As long as your conscientious of the changes and don't go changing anything that looks wrong you'll be fine.
User avatar
decipha
Tooner
 
Posts: 15311
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Questions about EEC Fan Control

Unread postby NIKwoaC » Sat May 12, 2018 7:54 am

Thanks for all the help man. Drove it to work yesterday and everything worked flawlessly.

I thought I'd show off how I wired the "fan off" warning lamp. I wired it into the factory shift light, which was previously unused (I don't know if it just came from the factory like that or if the PO removed it. It never had a lightbulb or even wiring running to it). Right now it still has the "SHIFT" text, but I plan to change it to read "FAN OFF" and probably also change the color to red.

https://www.youtube.com/watch?v=pI2u83_oHp0

The LED is fairly bright and it washes out my cell phone camera, so I can't really get a good picture of it...
NIKwoaC
General Poster
 
Posts: 18
Joined: Tue Aug 04, 2015 6:58 pm
Name: Nik
Vehicle Information: 1986 Mustang GT
Stock rebuilt 5L shortblock with Twisted Wedge 205 heads, Trick Flow R intake (long runner), 90mm TB, custom cam. ~ 9.8:1 CR, 42 lb injectors, 97mm Abaco MAF, Astro built "Cobra spec" T5, shorties with full 2.5" exhaust, Half ass self tuned with BE/EA and a Quarterhorse on an A9L with an A9L2-based tune. 336.3 HP @ 6050 RPM, 323.9 ft-lb @ 4700 RPM


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