Toyota MR2 SW20 Engine lid fan install - N8s way

N8s93turbo · 01-06-2006, 10:52 AM

For those of you thinking about installing engine lid fans or those of you who have them and just aren't sure how you want to go about wiring them this may be helpful. There are more than way wire you fan setup. The following way is how i chose to do it.

There are many fancy fan shrouds out there made of carbon fiber, polished aluminum etc. For my setup i used a simple 7.5 pusher spal fan. I tucked it up between the shroud and engine lid and used a heavy duty construction glue, drys clear and holds strong. You can pick the engine lid up by the fan and it holds fine. Looks very indiscrete and clean, the cheapest way to go. Very nice if your on a budget like myself.

How It Works: I chose to wire my fan directly to the Intercooler power wire, rather than to the relay. This way the engine lid fan will only come on when the engine temp sensor is tripped. Then i wired the IC fan (also a 7.5 spal fan) to the relay. Now when you turn the car on the IC fan runs and once the engine heats up and trips the sensor, the engine lid fan comes on.

Wiring: Now we are ready to begin setting up the relay. We will be using a simple 4 or 5 pin auto relay(with the 5pin you will not use the center pin). You can get them at radio shack for around $3. You will also need an inline fuse, some wire connectors, and a roll of 12-16ga wire. Everything should be purchased for under $15 minus the cost of the fan. I chose to remove the engine lid (5min) to mount the fan easier and hide the wire. You'll need to extend the wires on the spal fan so that it can reach the ic fan wire plug and ground.

Using the diagram you will set the relay up as followed:
1. TOP HORIZONAL - Attach wire from pin #1 to the ic fan
2. LEFT VERTICAL - Attach wire from pin #2 to a switched ignition wire. Easiest place is inside the fuse box located on the drivers side rear corner of the engine bay. Use a test light you'll need to find a wire that is only hot when the ignition is on.
3. RIGHT VERTICAL - Attach wire from pin#3 to a ground.
4. BOTTOM VERTICAL - Attach wire from pin#4 to a wire that has constant power. Easiest place is in the same fuse box listed above. I also recommend you use and inline fue for this wire.

Now your relay is all connected and ready to go. The last thing you will need to do is ground the ic fans other wire. The one fan wire goes to the relay, stated above, and the other wire is the ground. To test the fan you can simply unplug the engine temp sensor located on the engine lid. Turn the ignition on and both fans, engine lid and ic, should kick on. Make sure they are both blowing air the right direction. If one or both fans are blowing the wrong way you just have the fan power and ground wires crossed.

Your setup is now complete. Feel free to ask questions as i may have overlooked a step. Pictures will be coming soon.

canadam · 01-06-2006, 07:21 PM

Nice write-up, Nate - thanks !

Weasy2k · 01-07-2006, 07:40 PM

thats a cool write up! GOod work

DrPaine · 01-08-2006, 06:51 PM

I think I may go do this in a few days. Ur the man N8t.

Mekkahfire · 01-19-2006, 04:10 PM

Im going to do this, but with dual spals and that metal POS is coming off...

5FistsoftheNorthStar · 01-23-2006, 11:13 PM

Im gonna do this too, but not any time soon. Please don't toss this thread out.

Kurdain · 12-14-2006, 11:42 AM

A nice addition to this modification is to solder a 1kohm resistor across the leads to the temp sensor.

This lowers the trip temperature when the IC fan kicks on to around 70-80 degrees instead of 140'ish.

That way your engine warms up normally and then the fan(s) kick on later.

Ben · 03-17-2007, 11:01 PM

I Just Got My Spal 7.5" Intercooler Fan, Can I Just Cut The Stock Fan Harness Off And Solder It To The Spal? Has Anyone Done This?

Ben · 03-18-2007, 03:06 PM

Anybody?

N8s93turbo · 03-18-2007, 09:05 PM

Quote:

Originally Posted by Ben

I Just Got My Spal 7.5" Intercooler Fan, Can I Just Cut The Stock Fan Harness Off And Solder It To The Spal? Has Anyone Done This?

that will work or you can buy connectors so u dont have to cut anything.

Ben · 03-18-2007, 09:36 PM

^ Will I Need To Wire In A Fuse? I Can't Find How Much Power The Spal Uses - Their Website Doesn't Say. I Don't Want To Blow Anything Up.

N8s93turbo · 03-19-2007, 09:09 AM

i did not put a fuse on my ic fan but for the engine lid fan i used a relay.

codename607 · 06-25-2007, 12:33 AM

i want to do this but can't find a fan cheap in the stores. do you think i can get a fan from the salvage yard?

N8s93turbo · 06-25-2007, 10:39 AM

possibley. what is your budget?

codename607 · 06-25-2007, 02:18 PM

Right now i have bout 50 bucks i can spend in something like this. I seen some fans on eBay that are pretty cheap but the shipping to Hawaii is what puts me in the hole.

01-06-2006, 10:52 AM	#1 (permalink)
N8s93turbo TEAM A.S.S. RACING Join Date: Feb 2005 Location: Mississippi/Pennsylvania Posts: 2,473 Thanks: 5 Thanked 26 Times in 17 Posts My Google Map iTrader Rating: (14/100% )	Toyota MR2 SW20 Engine lid fan install - N8s way For those of you thinking about installing engine lid fans or those of you who have them and just aren't sure how you want to go about wiring them this may be helpful. There are more than way wire you fan setup. The following way is how i chose to do it. There are many fancy fan shrouds out there made of carbon fiber, polished aluminum etc. For my setup i used a simple 7.5 pusher spal fan. I tucked it up between the shroud and engine lid and used a heavy duty construction glue, drys clear and holds strong. You can pick the engine lid up by the fan and it holds fine. Looks very indiscrete and clean, the cheapest way to go. Very nice if your on a budget like myself. How It Works: I chose to wire my fan directly to the Intercooler power wire, rather than to the relay. This way the engine lid fan will only come on when the engine temp sensor is tripped. Then i wired the IC fan (also a 7.5 spal fan) to the relay. Now when you turn the car on the IC fan runs and once the engine heats up and trips the sensor, the engine lid fan comes on. Wiring: Now we are ready to begin setting up the relay. We will be using a simple 4 or 5 pin auto relay(with the 5pin you will not use the center pin). You can get them at radio shack for around $3. You will also need an inline fuse, some wire connectors, and a roll of 12-16ga wire. Everything should be purchased for under $15 minus the cost of the fan. I chose to remove the engine lid (5min) to mount the fan easier and hide the wire. You'll need to extend the wires on the spal fan so that it can reach the ic fan wire plug and ground. Using the diagram you will set the relay up as followed: 1. TOP HORIZONAL - Attach wire from pin #1 to the ic fan 2. LEFT VERTICAL - Attach wire from pin #2 to a switched ignition wire. Easiest place is inside the fuse box located on the drivers side rear corner of the engine bay. Use a test light you'll need to find a wire that is only hot when the ignition is on. 3. RIGHT VERTICAL - Attach wire from pin#3 to a ground. 4. BOTTOM VERTICAL - Attach wire from pin#4 to a wire that has constant power. Easiest place is in the same fuse box listed above. I also recommend you use and inline fue for this wire. Now your relay is all connected and ready to go. The last thing you will need to do is ground the ic fans other wire. The one fan wire goes to the relay, stated above, and the other wire is the ground. To test the fan you can simply unplug the engine temp sensor located on the engine lid. Turn the ignition on and both fans, engine lid and ic, should kick on. Make sure they are both blowing air the right direction. If one or both fans are blowing the wrong way you just have the fan power and ground wires crossed. Your setup is now complete. Feel free to ask questions as i may have overlooked a step. Pictures will be coming soon. Attached Thumbnails Last edited by N8s93turbo; 01-07-2006 at 08:04 PM.

01-06-2006, 07:21 PM	#2 (permalink)
canadam MidshipExpress Join Date: Feb 2005 Location: Beautiful British Columbia Posts: 9,549 Thanks: 117 Thanked 129 Times in 112 Posts My Google Map iTrader Rating: (29/100% )	Nice write-up, Nate - thanks ! __________________ WTB ASAP: Black Glove Box Surround - Not the box itself, but the dash plastics it sits in 3SGTE Upper Timing Belt Cover Driver's side seatback - must have bolster and lumbar adjustments, cover condition does not matter - will trade non-adjustable. Genuine Tom's Sides and Rear - replica kits not considered Frunk Plastics - no cracks Mechanical Gauge Cluster - KP/H preferred, but not required. Engine Bay X Brace

01-07-2006, 07:40 PM	#3 (permalink)
Weasy2k 3.4L 10K RPM In the works Join Date: Mar 2005 Location: Vancouver, BC Posts: 8,895 Thanks: 34 Thanked 80 Times in 66 Posts iTrader Rating: (9/100% )	thats a cool write up! GOod work __________________ -Johnny @ Sea2Sky Tuning - www.sea2skytuning.com http://www.mr2.com/forums/sea2sky-tu...-out-sale.html

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MR2 Technical Knowledgebase	This thread	Refback	01-26-2009 10:59 AM
MR2 Technical Knowledgebase - Toyota MR2 SW20 Engine Lid Fan Install - N8s way	This thread	Refback	06-18-2008 09:36 AM
MR2 Technical Knowledgebase	This thread	Refback	05-14-2008 02:45 PM

01-08-2006, 06:51 PM	#4 (permalink)
DrPaine Boost Whore! Join Date: Oct 2005 Location: Hershey, PA Posts: 319 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (1/100% )	I think I may go do this in a few days. Ur the man N8t.

01-19-2006, 04:10 PM	#5 (permalink)
Mekkahfire Gone But Not Forgotten Join Date: Mar 2005 Location: Westerville OH Posts: 1,359 Thanks: 9 Thanked 3 Times in 3 Posts iTrader Rating: (2/75% )	Im going to do this, but with dual spals and that metal POS is coming off...

01-23-2006, 11:13 PM	#6 (permalink)
5FistsoftheNorthStar The Mighty Gen3 Join Date: Jan 2006 Location: Your basement Posts: 1,018 Thanks: 15 Thanked 8 Times in 8 Posts iTrader Rating: (3/100% )	Im gonna do this too, but not any time soon. Please don't toss this thread out.

12-14-2006, 11:42 AM	#7 (permalink)
Kurdain Cage Fighter Join Date: Oct 2006 Posts: 686 Thanks: 39 Thanked 35 Times in 29 Posts iTrader Rating: (9/100% )	A nice addition to this modification is to solder a 1kohm resistor across the leads to the temp sensor. This lowers the trip temperature when the IC fan kicks on to around 70-80 degrees instead of 140'ish. That way your engine warms up normally and then the fan(s) kick on later.

03-17-2007, 11:01 PM	#8 (permalink)
Ben Same In The End Join Date: Aug 2006 Location: Oceanside, CA / Reno, NV Posts: 3,927 Thanks: 18 Thanked 276 Times in 258 Posts My Google Map iTrader Rating: (11/100% )	I Just Got My Spal 7.5" Intercooler Fan, Can I Just Cut The Stock Fan Harness Off And Solder It To The Spal? Has Anyone Done This?

03-18-2007, 03:06 PM	#9 (permalink)
Ben Same In The End Join Date: Aug 2006 Location: Oceanside, CA / Reno, NV Posts: 3,927 Thanks: 18 Thanked 276 Times in 258 Posts My Google Map iTrader Rating: (11/100% )	Anybody?

03-18-2007, 09:36 PM	#11 (permalink)
Ben Same In The End Join Date: Aug 2006 Location: Oceanside, CA / Reno, NV Posts: 3,927 Thanks: 18 Thanked 276 Times in 258 Posts My Google Map iTrader Rating: (11/100% )	^ Will I Need To Wire In A Fuse? I Can't Find How Much Power The Spal Uses - Their Website Doesn't Say. I Don't Want To Blow Anything Up.

03-19-2007, 09:09 AM	#12 (permalink)
N8s93turbo TEAM A.S.S. RACING Join Date: Feb 2005 Location: Mississippi/Pennsylvania Posts: 2,473 Thanks: 5 Thanked 26 Times in 17 Posts My Google Map iTrader Rating: (14/100% )	i did not put a fuse on my ic fan but for the engine lid fan i used a relay.

06-25-2007, 12:33 AM	#13 (permalink)
codename607 Some Skills Join Date: May 2007 Location: Wahaiwa Hawaii Posts: 93 Thanks: 28 Thanked 1 Time in 1 Post My Google Map iTrader Rating: (0/0% )	i want to do this but can't find a fan cheap in the stores. do you think i can get a fan from the salvage yard?

06-25-2007, 10:39 AM	#14 (permalink)
N8s93turbo TEAM A.S.S. RACING Join Date: Feb 2005 Location: Mississippi/Pennsylvania Posts: 2,473 Thanks: 5 Thanked 26 Times in 17 Posts My Google Map iTrader Rating: (14/100% )	possibley. what is your budget?

06-25-2007, 02:18 PM	#15 (permalink)
codename607 Some Skills Join Date: May 2007 Location: Wahaiwa Hawaii Posts: 93 Thanks: 28 Thanked 1 Time in 1 Post My Google Map iTrader Rating: (0/0% )	Right now i have bout 50 bucks i can spend in something like this. I seen some fans on eBay that are pretty cheap but the shipping to Hawaii is what puts me in the hole.