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Old 09-15-2013, 06:05 PM   #1
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single to dual fans

Hey everyone i have a 92 camaro rs with a 3.1L and it came with a single fan. This was not enough for me so i swapped in a dual fan set from an lt1 car i for cheap. However im not a big wiring guy so i blew the relay. The car doesnt have ac so i was just going to have then come on at the same time.
Question one, car comes with a 30amp relay. Can i just drop in a 60amp and solve issue?
Question two, other way EASILY wire in duals?

Thanks in advanced
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Old 09-15-2013, 06:14 PM   #2
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Wire it directly to the battery. When the key is on, its on.. And idk, what the single fan not being enough means, because several of the third gen v8's had them, so if you were having overheating problems and used this fan to stop that, I would certainly find the reasoning of getting hot. These fans will not make a big enough difference to overcome any of your problems. Of you mean you just wanted to swap it, and didn't have any problems, that's alright then... Lol
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Old 09-15-2013, 06:20 PM   #3
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Only had a problem once but it was 100 degrees outside. Just like to keep it cooler. Wiring directly too battery keeps them on when car is off tho right?
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Old 09-15-2013, 06:38 PM   #4
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Would be better to have the fans wiring harness from the LT1 car. Harness, relay.
And yes, wiring it straight to the battery will keep them on at all times. You DO NOT want that for obvious reasons.
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Old 09-15-2013, 07:02 PM   #5
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Well it's actually called hard wiring and no. I have it done to my car. It keeps it on at all speeds and temps, whereas I think stock they shutoff at 40mph(?)

Here's a link:
http://www.thirdgen.org/techboard/el...ay-switch.html
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Old 09-15-2013, 07:15 PM   #6
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Quote:
Originally Posted by A92RSnamedSARGE View Post
Well it's actually called hard wiring and no. I have it done to my car. It keeps it on at all speeds and temps, whereas I think stock they shutoff at 40mph(?)

Here's a link:
http://www.thirdgen.org/techboard/el...ay-switch.html
Ok, in your first post:
1: there is a difference in wiring it "straight to the battery" and wiring it to the ignition.
2: you didn't say anything about a separate switch wired in with it To control it on/off
3: yes, I know its called "hard wiring"
4: yours ISN'T wired straight To the battery. It's wired through the ignition.
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Old 09-15-2013, 07:35 PM   #7
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Quote:
Originally Posted by Ercmann View Post
Would be better to have the fans wiring harness from the LT1 car. Harness, relay.
And yes, wiring it straight to the battery will keep them on at all times. You DO NOT want that for obvious reasons.
He would also need the fuse and relay box and the LT1 PCM

With dual fans at low speed the fans are powered in series ( aka 6 volts each ) at high speed they are powered separately ( 12 volts each )

Were talking some serious wiring issues here.
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Old 09-15-2013, 07:40 PM   #8
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Quote:
Originally Posted by Ercmann

Ok, in your first post:
1: there is a difference in wiring it "straight to the battery" and wiring it to the ignition.
2: you didn't say anything about a separate switch wired in with it To control it on/off
3: yes, I know its called "hard wiring"
4: yours ISN'T wired straight To the battery. It's wired through the ignition.
Yeah I know what I said. Which is why I came back. Also I have mine wired without any switch, if the ignition is on its on, no in between. And when I came back you guys had already quoted me so I couldn't fix it. But there doesn't need to be any sort of switch at all, let it run continuously.
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Old 09-15-2013, 07:47 PM   #9
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The problem with always on fans is that they actually restrict airflow if running when driving over 40 MPH.
That's why the PCM turns the fans off over 40 MPH.
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Old 09-15-2013, 07:59 PM   #10
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So we can agree i can wire in fairly easily but could i just swap a relay to a larger one a problem?
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Old 09-15-2013, 08:11 PM   #11
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Quote:
Originally Posted by NavyVet
The problem with always on fans is that they actually restrict airflow if running when driving over 40 MPH.
That's why the PCM turns the fans off over 40 MPH.
This.... This is something I've always heard but always hated. I don't see how it makes sense. Not only that but just found no proof anywhere to support it... But everyone has always told me this. And here are my points against this theory:

1) it is behind the radiator, so it's not inhibiting that In any way
2) below it is an air dam, above it is the fan shroud and lip of the engine bay, in front of it is the radiator, and various pieces of plastic and the front end.
3) although airflow does go through the radiator and past the fan, it doesn't do too much to affect the heat I wired my fan to the ignition and saw no differences.
4) 10x more air goes from under the car and up and hits the engine block.
5) point number 4 is why I can sit my car in the driveway and it not overheat after ~40 minutes.
6) while it is nice to have all that airflow, how much does the fan running actually "hurt"? In my exp none...
Just my .02

Edit: not to sound like a dick bag or anything just my thoughts and opinions...
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Old 09-15-2013, 08:35 PM   #12
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From an LT1 stand point I back what NavyVet said up 100%. From my own experience with tuning leaving the fans on at higher speeds doesn't keep the car any cooler. Leaving the fans running keeps the CFM through the radiator at a consistent CMF regardless of speed (it's hard to explain but that's just how they work). With the fans off the flow through the radiator is whatever the air dam and the shields can flow through the radiator.

For example I had to relocate my radiator with the turbo, even with both fans running it would run hot (warmer than I wanted) but with the shields back in and an (improved) air dam I can keep my temps where I want them on the highway.
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Old 09-15-2013, 08:35 PM   #13
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In reply to #5 I can sit in my driveway with the A/C on for an hour and the car won't overheat.

As for the rest, because the fans can free wheel when off instead of being limited to a certain RPM when powered.

However , on a hot day down here when exiting a freeway after a 30 minute ( or longer ) drive you can sure see the power surge on the volt gauge as they turn on as you go under 40 slowing down.
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Old 09-15-2013, 08:39 PM   #14
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Quote:
Originally Posted by luckiewoody View Post
So we can agree i can wire in fairly easily but could i just swap a relay to a larger one a problem?
One relay won't handle both fans, that's why early 4th gens had two relays and later had 3.
Relay one and two on both fans on low at six volts.
Relay one and 3 on and two off. both fans powered at 12 volts for high speed.

The relays are always powered, the PCM grounds them to actuate them and turn the fans on low or high.
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Old 09-15-2013, 10:29 PM   #15
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Quote:
Originally Posted by NavyVet View Post

He would also need the fuse and relay box and the LT1 PCM

With dual fans at low speed the fans are powered in series ( aka 6 volts each ) at high speed they are powered separately ( 12 volts each )

Were talking some serious wiring issues here.
Thanks NavyVet. At least you know how to correct someone without being a jerk about it :-)
And my apologies for incorrect info :-(
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Old 09-17-2013, 02:27 PM   #16
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Quote:
Originally Posted by Ercmann

Thanks NavyVet. At least you know how to correct someone without being a jerk about it :-)
And my apologies for incorrect info :-(
I feel like this was directed at me obviously. I meant no disrespect at all and certainly had no intention of being a jerk. I was simply trying to correct myself, and say to you guys that I used a horrible description to give OP a solution. I like talking to you ercmann, so I'd you felt that then I do apologize...
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Old 09-17-2013, 02:30 PM   #17
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Quote:
Originally Posted by A92RSnamedSARGE View Post

I feel like this was directed at me obviously. I meant no disrespect at all and certainly had no intention of being a jerk. I was simply trying to correct myself, and say to you guys that I used a horrible description to give OP a solution. I like talking to you ercmann, so I'd you felt that then I do apologize...
No, not at all directed toward u ! It's all good ! :-)
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Old 09-17-2013, 02:33 PM   #18
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Ha alright. Yeah I googled I'm sorry meaning to get one picture, but I couldn't choose.... So I chose them all lol. I just figured that I was the only person other than navyvet that it was me by process of elimination...
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Old 09-17-2013, 02:37 PM   #19
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Quote:
Originally Posted by A92RSnamedSARGE View Post
Ha alright. Yeah I googled I'm sorry meaning to get one picture, but I couldn't choose.... So I chose them all lol. I just figured that I was the only person other than navyvet that it was me by process of elimination...
Nah.. Was just a generic comment. From past posts by me. And the correction of not so nice members of past posts. I admit I'm not the sharpest tool in the shed, but I DO have my specialties. But I am wrong sometimes. And am man enough to admit it.
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Old 09-17-2013, 02:55 PM   #20
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Quote:
Originally Posted by Ercmann

Nah.. Was just a generic comment. From past posts by me. And the correction of not so nice members of past posts. I admit I'm not the sharpest tool in the shed, but I DO have my specialties. But I am wrong sometimes. And am man enough to admit it.
Ahh I see, I see... I was just making sure. Didn't want to start a tiff on a forum for little to no reason. But if it wasn't about me then in that case, I was right, am always right, and when I'm wrong... Well I'm still right lol.
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