home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > performance & modifications

Reply
 
Thread Tools Display Modes
Old 09-14-2021, 01:58 PM   #1
BeaverMeat
Board Member
 
BeaverMeat's Avatar
 
Join Date: Aug 2020
Location: Vancouver Island
Default e-fan power cut-off relay

Maybe I didn’t look hard enough but, I can’t seem to find any wiring diagrams to install a relay to cut power to the e-fan when the key is switched off.

How do you wire this in?
__________________
Quote:
She’s built like a steakhouse but, she handles like a bistro.
BeaverMeat is offline   Reply With Quote
Old 09-14-2021, 02:02 PM   #2
JohnMc
PV Abuser
 
JohnMc's Avatar
 
Join Date: May 2004
Location: St. Louis
Default

Switched low amperage 12V --> 86
Ground --> 85
non-switched high amperage 12V --> 30
fan --> 87

Or you could cut the signal wire to the current fan relay and route it though terminals 30 and 87.
__________________
'63 PV Rat Rod
'93 245 16VT Classic #1141
JohnMc is online now   Reply With Quote
Old 09-14-2021, 03:27 PM   #3
gsellstr
Vintage anti-ricer
 
gsellstr's Avatar
 
Join Date: Oct 2004
Location: BFE Desert east of Cali
Default

I went the route of cutting the signal wire on mine, but I also have manual bypasses for track use so that route worked better in my instance.

John's right on the money. Just make sure you use a good relay, as the 940 e-fan's can pull up to 40A.
__________________
RIP
Doug Williams "Mr. Doug" 4/15/2009
Pete Fluitman "fivehundred" 7/14/2013
Mick Starkey "TrickMick" 1/10/14
Mark Baldwin "blue850t5" 7/19/18
Nick Fengler "fengler" 8/6/18
Thomas Fritz "stealthfti" 10/11/18
Bob Davi "bob davi" 10/2021

74 144 B20
http://forums.turbobricks.com/showthread.php?t=224983

90 745Ti
http://forums.turbobricks.com/showthread.php?t=334698

If you need Superpro bushings PM me for price and availability!
gsellstr is offline   Reply With Quote
Old 09-14-2021, 03:30 PM   #4
JohnMc
PV Abuser
 
JohnMc's Avatar
 
Join Date: May 2004
Location: St. Louis
Default

And I have both my Volvos wired intentionally to allow the fan to run with the key off. On the antiquated PV's unsealed system, a hot shut off can otherwise lead to a couple of burps and a little coolant spillage. And on the turbo LS 240, it's nice to have the fan cycle a couple of times to get everything cooled off a little bit under the hood. I suppose a temp sensor could fail and cause it to run a battery down, but I've never had any issue.
JohnMc is online now   Reply With Quote
Old 09-14-2021, 03:51 PM   #5
BeaverMeat
Board Member
 
BeaverMeat's Avatar
 
Join Date: Aug 2020
Location: Vancouver Island
Default

I’m using a Volvo 2-speed relay. To clarify I only want the low speed (which isn’t hooked up) to turn off with the key. I want the high speed to stay on after shutdown.

I am emulating the SN95 Mustang low speed settings with a 208/on 199/off fan switch. At those ranges the fan will stay on for a long time after shutdown.

Was thinking of putting a relay on the low speed signal wire. I just don’t know what circuit to tie into.
BeaverMeat is offline   Reply With Quote
Old 09-14-2021, 03:54 PM   #6
JohnMc
PV Abuser
 
JohnMc's Avatar
 
Join Date: May 2004
Location: St. Louis
Default

Running a cube relay takes almost no current. Just find some switched 12V source and tap it.
JohnMc is online now   Reply With Quote
Old 09-18-2021, 07:49 PM   #7
BeaverMeat
Board Member
 
BeaverMeat's Avatar
 
Join Date: Aug 2020
Location: Vancouver Island
Default

Quote:
Originally Posted by JohnMc View Post
Running a cube relay takes almost no current. Just find some switched 12V source and tap it.
Hmmm. What under-dash source do you recommend? I’m not too experienced with Volvo electrics. well, most automotive electrics for that matter.
BeaverMeat is offline   Reply With Quote
Old 09-19-2021, 08:59 AM   #8
lookforjoe
Making Volvo Parts Fit
 
lookforjoe's Avatar
 
Join Date: May 2008
Location: Rockland County, NY
Default

The eFan relay triggers 1 & 2 ground through the ECU - if that's what you have. You would just need to cut the #1 low speed ground wire coming from the ECU connector (check the diagram for ECU pin-out) & connect that to the 30 /87 circuit of your new relay, then connect 86 to the accessory power rail in the fuse/relay panel, same for 85 - go the ground rail.
__________________

My XR July2013 - 446AWHP @ 8K rpm C30 AWD conversion 740 pickup thread Feedback Thread
lookforjoe is offline   Reply With Quote
Old 09-20-2021, 08:38 PM   #9
BeaverMeat
Board Member
 
BeaverMeat's Avatar
 
Join Date: Aug 2020
Location: Vancouver Island
Default

Yeah… it’s a home-brew arrangement of a 5.0HO, 2.4 diesel rad, V6 Contour rad fans, 740 two-speed relay, 760 “Regina” fan switch, and an other fan switch from a European market Suzuki Swift.

I’m going to use the power wire from the aftermarket Sunpro tach. It’s going to get disconnected anyways.

Last edited by BeaverMeat; 09-20-2021 at 08:46 PM.. Reason: See
BeaverMeat is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


All times are GMT -4. The time now is 10:44 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.