As the original poster, I've been very proud of this thread and all the sharing that has taken place within it. Everyone who has contributed to it spent lots of time researching and learning what they shared. We all spent lots of money on the things that did not work before posting what did, we made lots of mistakes and tried to inform others so they would not have to make the same ones. For instance, the kind of advice Dave Mikels' has offered up in this thread is the result of YEARS of experience. That's what has always been so cool about these forums. Thank you to everyone who has freely contributed what you have learned in this thread.

Well put.

I'm putting all this information into direct use just over the past few days as my LS9 69 Camaro project has finally gotten out of paint jail.

I appreciate all the information and hard work. This has been a real highlight of a thread for the past couple of years!

Not one of us could do this sort of stuff by ourselves.

Information wants to be free. Set it free!

Andrew

Related question
 

In a related question, I'm using the stock ZR1 intercooler (charge coolant) pump and it has a two prong connector (just 12v power and ground). The GMPP LS9 harness has three wires (which are 12V, PWM signal -- J3-42 lt. blue/white, and ground)

The stock ZR1 runs without a PWM-controlled intercooler pump, and the GMPP LS9 harness has a PWM connector for the coolant pump. Why are ZR1 LS9 and the GMPP crate LS9 wired differently in this case?

Any insight or help is much appreciated!

For others looking to mount the Corvette C6 fan on an aluminum radiator. I found that C&R Racing makes a OEM style aluminum radiator for Corvettes. I contacted them & was able to purchase the little mount tabs from them.

http://www.crracing.com/wp-content/u...rvette-Rad.jpg

http://i242.photobucket.com/albums/f...t/crracing.jpg

Scot,

Good stuff. So you ordered 2 of each? I gather each one of the part number is specific to the 4 corners...right?

Andrew

I ordered 2 of the 0.55" tall with mounting hole & two of the 0.55" tall without mounting hole. Going off of the diagram they sent me, opposite diagonal corners are the same part.

http://i242.photobucket.com/albums/f.../crracing2.jpg

Awesome. Just called them and ordered some. Surely I can cobble something together using the brackets and some other pieces.

Andrew

My little clips showed up today, looks like they have been cut with a waterjet. Fan should be here soon as well as the radiator. Then can have them welded on.

http://i242.photobucket.com/albums/f...212_180812.jpg

Funny...mine showed up today as well. I am sure they are wondering what the heck is going on. C&R probably didn't sell this many all of last year...LOL

http://www.pro-touring.com/~andrewb/cougar/258.jpg

http://www.pro-touring.com/~andrewb/cougar/259.jpg

Andrew

Those brackets are going to make this fan a lot easier to mount. Nice!

I got some good tech on this over on CorvetteForum: http://www.corvetteforum.com/forums/...mp-wiring.html

You got some good tech over there John. Here is a link that might be handy:

http://www.lingenfelter.com/mm5/merc...gory_Code=C534

Lingenfelter makes upgraded coolant pumps that are PWM. Isn't that what you want for this build?

Andrew

Yes, and no. I wanted a PWM installation because I thought that's what GM did with the C6 ZR1. But they didn't -- they just run the pumps at full speed. They even run the pump at full speed in the C7Z06.

My main question was the 3rd wire in the provided GMPP harness -- which I now know is a 5V signal to the ZL1 pump to, you guessed it, run the ZL1 pump at full speed. That wire is not a PWM signal, and there is no PWM option anywhere in the GM lineup, which continues to the present day.

Even the LPE Stewart option just runs at full speed, and is advertised as flowing as well as the ZR1 pump.

So... I'll run the ZR1 pump at full speed. It simplifies the wiring, and wraps up all the engine wiring questions.

Is the PWM fan control Function something that can be turned on with HP tuners?

Edit: Sorry! I thought you were asking about the coolant charge pump. Yep, the fans are easy to do.

HP Tuner dialog for the GMPP LS2 ECM tune. Others probably different.

http://i242.photobucket.com/albums/f...t/hpt_fans.jpg http://i242.photobucket.com/albums/f...hpt_fans-1.jpg

Hey Andrew, I got the C6 fan that you have. Wondering if you are seeing the same as I am. One of the clips with the hole, the hole doesnt line up with the hole in the fan shroud. You seeing that too?

Yes Sir. I noticed that too. I guess I'll slot the hole. Won't be a big deal since you have to use a u-bolt there anyway. I wonder what the stock bolts that go in that location look like. And why is the hole square? LOL

Andrew

I thought I would use something like this:

http://i242.photobucket.com/albums/f...95326_edit.jpg

That's it. I said u-bolt, but I meant u-nut.

Andrew

Ah, U-nut, I never knew what these things were called.

Scot,

Someone on another forum posted that there are supposed to be some sort of rubber grommets that go into those square holes in the fan shroud. Let's see if we can track those down.

Andrew

I'll find out. Probably something like this is my guess:

http://product-images.highwire.com/1966914/3316967.jpg

The ones with the metal inserts look about right. Where do you find those?

Andrew

I Google-ed "rubber damper insert". I think an ACE hardware store near me has them. Not sure they have the metal insert.

Wire seals finally showed up.

http://i242.photobucket.com/albums/f...224_073715.jpg

Now I have everything.

My installation
 

I've just finished wiring my customer's fans. I split the PWM signal (blue wire in, 2 green wires out) at the MetriPack 280 connector, and grounded the controllers to the radiator core support (just below the connector). The fan power and ground signals go down and connect to the fans below.

It looks nice John.

I just registered after reading this entire thread.

I'm trying to figure out how to wire up a SPAL brushless fan using the factory C6 PWM controller.

Essentially I just want to replace the OEM fan with a more efficient brushless fan and use the PWM controller and ECU to control it.

The new fan has a PWM controller input, but I'm not sure if I can wire it directly to the PWM wire on the fan controller.

Not sure I can help, but what is the SPAL part number of the fan which you have? I'm curious to read the installation manual for it...

There wasn't much information out there for the SPAL brushless fans a while back. If I remember right, the PWM controller is already built into those fans and are designed to run off of their sending unit.

Spal 30107035 (VA97-ABL309-98A) 17" brushless fan.

I've tried to look for any information on it, but cannot find very much. I was able to find a few schematics using their temperature sending unit and have the factory schematics, but I'm hoping to be able to use the ECU to control it.

I thought about running it in analog mode using the factory PWM controller, but don't know if that will function as originally designed.

http://imagizer.imageshack.us/v2/160...673/ouX47j.jpg

http://imagizer.imageshack.us/v2/160...907/K0QmdL.jpg

This is the only info I could find on that specific fan.

http://imagizer.imageshack.us/v2/160...903/uahsBn.jpg

In the above circuit diagram, what does this symbol represent:

http://i242.photobucket.com/albums/f...itt/symbol.jpg

Male/Female Inline Harness Connector

Ah, thanks. I didnt know if it was some type of electrical component. First thought was maybe a Diode, but then remembered it was a triangle with a line.

It seems that Spal makes various components to make this fan operate in PWM mode without using any sort of ECU, is that right?

Andrew

Yes, they make a temperature sensor which controls the fan, but I still want to be able to control it using my ECU and tune.

I had a decent email conversation with SPAL tech support today. He informed me that there are only three wires going to the fan pos/neg/pwm. The yellow analog/override wire shown in the one schematic isn't actually present on the fan and that I need to use their white pwm wire to tell the fan how fast to run.

I told him I had the ability to adjust the pwm frequency and duty cycle in my ECU and he provided me with this response curve, but I still don't know how to make it work.

http://imageshack.com/a/img909/7557/1fPP9r.jpg


So now the question is what how do I use their pwm wire with my ECU.

He said 128 Hz should be ok, but if I really want to change it 100Hz would be the optimal.

Can I just change my PWM frequency in my ECU to 100 Hz and connect the green pwm fan controller wire to the white pwm fan wire?

What ECU are you using?

Andrew