PWM fan control with Holley Dominator ECU
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- čas přidán 8. 09. 2024
- In this video I show what is needed to have the Holley Dominator ECU control the cooling fan via Pulse Width Modulation (PWM). Tip: When filling the table, make sure the values are between 5 and 90% duty cycle. The fan will not run with values above 90% duty cycle. At 5% the fan is off.
7 years later and still helpful.
Thanks for the video, this is great info! I purchased the C6 fan module to pwm- my Mark VIII fan on Holley HP ECM.
Glad to be of help!
Excellent video. Keep em coming
Awesome thanks. Should of changed the x axis to speed for the vid, but the needed detail was there thanks.
Awesome. Many thanks from the UK - I was wondering what output I should be using now I know ! - given me the confidence to install the same C6 module in my SBC based project car (HP rather than dominator).
Being rear engined, cooling has been tricky, I think this will help ALOT!
Glad to help. Just to be clear, the C6 module must be used with the Holley ECU, or other engine management systems that provide a PWM- output. The C6 module is not meant to be used as a stand alone system.
Yep. Thanks - I am using the Holley HP EFI (2 PWM outputs) and V4 of the software - I came here from the link you posted in the Holley forums :) Next thing I want to look at is controlling the fuel pump with my other PWM output.
thanks for this! 5 years later, still getting hits ... useful info is always gold :) do you know what kind of amp load the module can handle? i can't seem to get that data, some suggest 40, some even 80.
The C6 fan is rated at 400 watts, which is about 33 amps at 12 volts. One of my customers recently blew a C6 controller by running two fans that together pulled over 40 amps. You can run two fans and use two controllers, and just split the PWM- signal wire. The smarter play these days is to use a C7 Corvette fan, which has a built in controller and is rated at 600 watts. It's a beast.
This seems to be a great controller. I'm considering the Dominator if I swap my truck with an LS stroker build.
+Guns Cars and Digits The Dominator ECU is awesome!
Hey Andrew , great video . Why did you chose PWM- ? . I'm trying to connect an Autometer speedo to my Dominator via the aux. harness and I'm confused . I just posted a question on Pro-touring . Help please .
Hey Andrew , can the c6 pwm handle twin 11" spal fans that will draw between 50 and 100 amps at start up . I realize that the fans come on slowly so I don't believe that they will draw 100 amps all at once . I'm running the Holley Dominator as well . Thanks
I don't have first hand experience to answer that question. However, the C6 fan is rated at 400watts, which works out to about 33 amps. I would look at the constant draw rating of the Spal fans and if it is around 33 amps or less, I would say you are good to go. I have also seen people use two C6 fan controllers. This is easy to do, since you can split the PWM- signal. If you have a Dominator, you have a lot of outputs, so you can also program two PWM- outputs and control the fans independently. For instance, if you have A/C, you can have one fan come on at 50% (I am just making up numbers as an example) when the A/C is turned on, regardless of engine temperature. Etc....
Thanks Andrew
No problem!
That. Is. Awesome ! Nicely Done.
If you don't mind, I'd like to know about the wiring.
1. The power and ground to the fan plug (Purple/Black) are connected directly to the battery? without a relay, diode,fuse, etc ...
Tyson, I have the power feeds connected to the battery and going through a 40 amp circuit breaker.
+projectgattago
Excellent. This seamed very easy and straight forward. I'd like to do the same. Though I'll use CTS. Will it try to run engine off /key on?
+Tyson Rexroat The fans will run with the key on, engine off. As long as the ECU is on, it will run the fan as needed.
Does the fan have an inclusive solid state relay to handle the PWM switching?
That's handled by the C6 Corvette fan controller.
Thank you for the awesome video! I have the Holley Dominator ECU. It has two ground-switched fan outputs in the stock harness. Is it possible to change these to PWM (-) instead of buying the additional input/output harness?
Unless Holley changed the harness, there are no wires for the fans. There are preset outputs in the Basic I/O section of the System IFC, but those cannot be reconfigured as PWM-. You need to load the I/O ICF (make sure you have software and firmware that supports this...I think v3 and higher) and then make a custom PWM output and assign it to an appropriate pin in the Pin Map. Hope this helps.
@@projectgattago that sucks that they don't allow you to remap Fan #1 and Fan #2 in basic I/O to PWM(-). Essentially they're forcing us to buy that $80 I/O harness in order to do PWM fans.
@@scotthunter3892 You don't have to get the Holley I/O harness. The I/O connector is a Metripack 150 connector. You can get the connector, terminals and cable seals from from Mouser or Waytek wire.
@@projectgattago for the auxiliary harness? I don't see any connectors in the 150 Series that will plug into the Dominator ECU J ports
@@scotthunter3892 The auxiliary harness plugs into the 8 cavity connector that is on the main harness. The Holley part number is 558-400. Delphi PN 12047931. Keep in mind that all of the parts have to be purchased separately. The PN I gave you is just the housing, you also need the terminals, cable seals, and TPA. You also need the proper Metri-Pack crimping tool.
muhammad nauman Anjum
1 second ago
hello . hope u r fine. my car radiator fan is triggered on through ECU. i want to kick start this fan a little earlier then normal. is thr any setting on ecu to change triggering temperature?
If there is tuning software available for your car, then yes.
This video is specifically for the Holley HP and Dominator systems. Without knowing what system you are using, I have no way to answer your question.