Thanks thats very helpful. They can do that too. I already have one of those in my car. But if they want something different they can always do their own math.

Yours is the easy idea though.

Marvin

 

You wouldn't have to have any part numbers on the red and green ones do you?

 

The part number was in the URL.

276-270 and 276-271.

 

Can this be done with just a three way switch. Without the lights. Kind of make it simpler.

 

DOH!
Thanks!

 

The lights are optional, but very beneficial, IMO.

 

Yea you really want the lights. Its cool to see when the computer turns them on. I think its probably one of the best mods ive done so far.

Craig

 

Is this gonna work on all Z28 cooling fans. I mean are they all 2 speed, Hi-Low. I am not sure if my cooling fans are two speed, hi-low, because when I checked them using the scanner I found out that each cooling fan starts at a different temperature. So, do they go into hi speed later when the temp rises.

 

Nifty little program aint it? Now where can I find one that helps with Hexfets or IGBT junction Temperature Calculations??

Oh wait, I meant to respond to BlueCamaroZ28. The answer is Yes. You will be able to control two speeds. Even if your fans are one speed. Its the way the Fan Driver relays are rigged. I saw one diagram and two fans were controled with two Relays first in series then in parallel. that made the fans work in two speed modes.

Marvin

 

MentalCaseOne,

Bless your heart.

 

You have the 2 relay system and not the 3 relay low/high system. Nothing is going to change that unless you add a relay and wiring to make it like the 3 relay system. You really don't need to, though. The fan switch will work fine with either system.
Cooling system info

Your LH fan comes on first, at the low temp threshold and the RH fan comes on at the high temp threshold. They already only run at full speed.

 

Shoebox,

That's great info. Thanks Man.

As I read the article, it says "Low speed is less noisy and should result in greater fan longevity. High speed is not always needed."

Is it possible to switch to the 3-relay setup. Would that have a conflict with the PCM if it tries to switch each fan at different temp.

 

go to radio shack, they sell LED's with resistors in them.

 

You could make it into the 3 relay setup if you wanted. There are factory schematics for both on my website. The pcm will never know the difference. Both systems use the green and blue wires for relay activation. You may even have an empty relay slot in the underhood electrical center to put a relay. You could wire it up with some terminal ends that could plug on to the relay. Just make the wiring look like the 3 relay schematic.

IMO, it's one of those jobs that you might do if you don't have anything else to play with. It probably won't make a big difference as far as cooling goes, but if you want it to be a little quieter, it might help.

 

So with the switch in the off position is runs as stock computer controled.... and you can see when the fans are running with the LEDs with the switch still in the off position?

thats pretty cool.
I'm going to use the schematic you linked to as well.

Lets hope it all works out good.

Thanks.


brown black black purple gold would be 700 ohm with a 5% variance??? is that how it works?