PWM cooling fan(s) control using ECM

[130fe]

Andrew, do you think the C7 fan would work well with the LS3 GMPP fan wire (without PWM)? I was the one that asked you questions about the C7 fan dimensions on IG yesterday. I currently have the Entropy radiator (and it’s controller) am looking at other radiator/fan options.

[andrewb70]

Originally Posted by 130fe

Andrew, do you think the C7 fan would work well with the LS3 GMPP fan wire (without PWM)? I was the one that asked you questions about the C7 fan dimensions on IG yesterday. I currently have the Entropy radiator (and it’s controller) am looking at other radiator/fan options.

Chris,

The fan wire on the GMPP harness is just a ground trigger for a relay, and will definitely not work with the C7 fan. Spal does offer tidy little controllers for their brushless fans, which I'm certain will work with the C7 fan. However, they are not adjustable, and you have to make sure to pick the right one for your thermostat, otherwise the fan will run all the time. It's definitely not as elegant as what I did on Sean's truck.

Andrew

[wiedemab]

Originally Posted by andrewb70

With my urging, one of my tuning customers installed a C7 Corvette fan in his 408 Windsor powered Ford F150 with the Holley Dominator ECU.

This fan works flawlessly with the Holley Dominator, which means it will work perfectly with all other Holley systems (excluding Sniper). Fan control was integrated with the AC system trinary switch, which enables different fan speed settings regardless of engine temperature.

He had his truck idling with the AC on in 95 degree AZ heat and the temperature never went above 186, with the fan hovering around 50-55% duty cycle.

Andrew

I may reach out when I get to this point in my build just to make sure I'm thinking of things correctly. First I'll read back through this thread!

I have the C&R w/ Spal setup that I plan to run in PWM with the Ford controller.... Should be fairly straight forward from a wiring perspective - - just want to validate my thinking on how to handle the signal from the AC...

[andrewb70]

Originally Posted by wiedemab

I may reach out when I get to this point in my build just to make sure I'm thinking of things correctly. First I'll read back through this thread!

I have the C&R w/ Spal setup that I plan to run in PWM with the Ford controller.... Should be fairly straight forward from a wiring perspective - - just want to validate my thinking on how to handle the signal from the AC...

Brandon,

Are you using Holley EFI?

Andrew

[CamaroAJ]

Originally Posted by andrewb70

With my urging, one of my tuning customers installed a C7 Corvette fan in his 408 Windsor powered Ford F150 with the Holley Dominator ECU.

This fan works flawlessly with the Holley Dominator, which means it will work perfectly with all other Holley systems (excluding Sniper). Fan control was integrated with the AC system trinary switch, which enables different fan speed settings regardless of engine temperature.

He had his truck idling with the AC on in 95 degree AZ heat and the temperature never went above 186, with the fan hovering around 50-55% duty cycle.

Andrew

The C7 fan is a good fan for 16" and 600w. The CTS-V fan is a bigger option at 19" and 850w if you have the room for it. Tuning wise it will be the same as you can plug and play a V fan in a C7 with a custom shroud like Dewitts does. Thats the fan Stielow has used before as well. Either fan is around $300.

[andrewb70]

Originally Posted by CamaroAJ

The C7 fan is a good fan for 16" and 600w. The CTS-V fan is a bigger option at 19" and 850w if you have the room for it. Tuning wise it will be the same as you can plug and play a V fan in a C7 with a custom shroud like Dewitts does. Thats the fan Stielow has used before as well. Either fan is around $300.

The CTSV fan is impressive, but most classic radiator shapes don't have enough height to accommodate it without a custom radiator.

[CamaroAJ]

Originally Posted by andrewb70

The CTSV fan is impressive, but most classic radiator shapes don't have enough height to accommodate it without a custom radiator.

a little cut and paste with some some juicy fruit and bingo, fits like a glove.

[andrewb70]

Originally Posted by CamaroAJ

a little cut and paste with some some juicy fruit and bingo, fits like a glove.

In case you haven't noticed, your fabrication skills are at least 2 standard deviations from the mean

Andrew

[CamaroAJ]

Originally Posted by andrewb70

In case you haven't noticed, your fabrication skills are at least 2 standard deviations from the mean

Andrew

Instagram filters lol

[durhamray1]

Originally Posted by andrewb70

I'm pretty sure you don't need the controllers with the brushless fans. They have everything built into the motor controllers, so you just need to provide power, ground, and a PWM- signal. Presumably the PWM- should be configured the same as with a C6 controller. This is somewhat speculative on my part.

Andrew

This is the information that I got from Spal on my brushless fan assy that I got from Wizzard Cooling , I think it answers all of the questions about wiring the internal PWM controller.