PWM cooling fan(s) control using ECM

[waynieZ]

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

[parsonsj]

Originally Posted by Me

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!

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

[andrewb70]

Originally Posted by parsonsj

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

[parsonsj]

Originally Posted by Andrew

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

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.

[130fe]

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

[parsonsj]

Originally Posted by Chris

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.

[samckitt]

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

[samckitt]

Originally Posted by andrewb70

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



Andrew

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?

[andrewb70]

Originally Posted by samckitt

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

[samckitt]

I thought I would use something like this: