 Water Cooled Question, Fan sequencing / works great! |
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| 76-914 |
  Dec 6 2013, 11:18 AM
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#1
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Repeat Offender & Resident Subaru Antagonist  Group: Members Posts: 13,828 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California 
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For my Suby 6 conversion I've installed a twin fan system (from a Dodge) on my radiator. One is single speed (3 wire) and the other is 2 speed (4 wire). Which one of these 2 fans comes on first? Do they both run at times? Will I use the 2nd speed of the 2 speed motor?
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| 76-914 |
Dec 8 2013, 08:41 PM
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#2
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,828 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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Help (IMG:style_emoticons/default/blink.gif) I'm trying to figure this schematic out. I see how low works. Relay #1 throws voltage to Fan #2 then back to relay#3 out pin #87a to Fan #1 and on to ground to power both fans on low. Right so far?? High is where I get confused. When pin33 (or Hi Speed) is grounded then relay #2 sends voltage to Fan #1 as well as 87a on relay #3 where it stops and does nothing because relay #3 is now energized breaking contact between 87a & 30. I'm assuming that pin #42 & #33 are not grounded simultaneously . What am I missing? I don't see Fan #2 getting voltage when hi circuit is energized??? (IMG:style_emoticons/default/WTF.gif) am I missing? (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif)
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| Mike Bellis |
Dec 8 2013, 09:22 PM
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#3
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Resident Electrician Group: Members Posts: 8,347 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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QUOTE(76-914 @ Dec 8 2013, 06:41 PM)  Help (IMG:style_emoticons/default/blink.gif) I'm trying to figure this schematic out. I see how low works. Relay #1 throws voltage to Fan #2 then back to relay#3 out pin #87a to Fan #1 and on to ground to power both fans on low. Right so far?? High is where I get confused. When pin33 (or Hi Speed) is grounded then relay #2 sends voltage to Fan #1 as well as 87a on relay #3 where it stops and does nothing because relay #3 is now energized breaking contact between 87a & 30. I'm assuming that pin #42 & #33 are not grounded simultaneously . What am I missing? I don't see Fan #2 getting voltage when hi circuit is energized??? (IMG:style_emoticons/default/WTF.gif) am I missing? (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif) (IMG:style_emoticons/default/headbang.gif) The schematic above takes 2 "same speed" fans and creates a hi/lo fan circuit. At low speed, Fan 2 gets power from the top relay. The ground path goes through fan 1. This gives each fan 6V or low speed. (Kirchoff's law) At high speed, both fans have 12V or high speed. Kirchoff's Law http://en.wikipedia.org/wiki/Kirchhoff's_circuit_laws |
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Posts in this topic
76-914 Water Cooled Question Dec 6 2013, 11:18 AM
mikesmith
For my Suby 6 conversion I've installed a twi... Dec 6 2013, 11:29 AM 76-914 I'm using the stock OEM Suby ECU. Dec 6 2013, 12:30 PM mikesmith Based on a quick Google search, it looks like ther... Dec 6 2013, 02:40 PM BIGKAT_83 I would turn the two speed on first at low speed a... Dec 6 2013, 04:58 PM
mgp4591
I would turn the two speed on first at low speed ... Dec 6 2013, 06:28 PM 76-914
I would turn the two speed on first at low speed ... Dec 7 2013, 08:41 PM
andys
I would turn the two speed on first at low speed ... Dec 9 2013, 01:21 PM BIGKAT_83
I would turn the two speed on first at low speed... Dec 9 2013, 01:45 PM BIGKAT_83 Started with a EG 3.3 and have since changed to a ... Dec 6 2013, 06:34 PM mgp4591
Started with a EG 3.3 and have since changed to a... Dec 6 2013, 06:50 PM Tom Old engineering principle , KISS. The more complic... Dec 6 2013, 07:17 PM mgp4591
Old engineering principle , KISS. The more compli... Dec 6 2013, 09:06 PM Mike Bellis I have mine on a dual thermostatic relays. They al... Dec 6 2013, 09:33 PM 76-914
I have mine on a dual thermostatic relays. They a... Dec 7 2013, 08:43 PM Tom Kent,
It looks like both pins 33 and 42 would n... Dec 9 2013, 02:16 AM Chris H. Kent,
Don't want to throw a wrench into thin... Dec 9 2013, 09:48 AM BIGKAT_83 You can cool these subarus with almost anything. T... Dec 9 2013, 10:24 AM Chris H. What the... Bob you have one of every motorized th... Dec 9 2013, 10:31 AM CptTripps That is an awesome setup! Lots less intrusive ... Dec 9 2013, 12:29 PM CptTripps I'm having one hell of a time locating a radia... Dec 9 2013, 07:12 PM Mike Bellis
I'm having one hell of a time locating a radi... Dec 9 2013, 08:02 PM skeates
I'm having one hell of a time locating a rad... Dec 10 2013, 01:08 PM Mike Bellis
A little "confection" goes a long way i... Dec 10 2013, 07:39 PM BIGKAT_83
I'm having one hell of a time locating a radi... Dec 10 2013, 05:49 AM 76-914 Mike & Tom, Thanks for explaining things to me... Dec 9 2013, 07:27 PM BIGKAT_83
Mike & Tom, Thanks for explaining things to m... Dec 9 2013, 07:34 PM 76-914 Spoke too soon. I see relay 2 powering Fan #1 @ hi... Dec 9 2013, 07:44 PM CptTripps That got me thinking...what about the front radiat... Dec 10 2013, 10:07 AM Mike Bellis
That got me thinking...what about the front radia... Dec 10 2013, 10:27 AM CptTripps YeH, that's what I'm thinking too. Looks a... Dec 10 2013, 12:35 PM 76-914 Got my fans & relays wired in tonite :Qarl: I... Dec 12 2013, 10:12 PM Chris H. Gotta bump this great thread...Just a quick questi... Aug 25 2014, 11:22 AM 76-914 Es verdad, Christo. Looks funny but think of stack... Aug 25 2014, 05:20 PM Chris H. Cool thanks Kent! Just seemed weird not groun... Aug 25 2014, 05:22 PM 76-914 Thought I'd add this bit of info re: this styl... Sep 1 2014, 10:06 AM messix
Thought I'd add this bit of info re: this sty... Sep 1 2014, 10:54 AM |
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