PWM cooling fan(s) control using ECM

[dontlifttoshift]

Yes, control wire will go directly to the fan, no controller needed. You will have to change the frequency to 100hz for the spal fan instead of the standard 128hz that GM runs.

I may have that backwards, but there is a post in this thread regarding the frequency that the Spal brushless wants and it wasn't the same as GM.

[Coursey]

Originally Posted by dontlifttoshift

Yes, control wire will go directly to the fan, no controller needed. You will have to change the frequency to 100hz for the spal fan instead of the standard 128hz that GM runs.

I may have that backwards, but there is a post in this thread regarding the frequency that the Spal brushless wants and it wasn't the same as GM.

Thanks,

I just want to confirm that you are talking about using the 2015 Camaro e38 ecm.

[dontlifttoshift]

Can not confirm E38 and I honestly missed that part of the question.


Unrelated to that but relevant to the discussion, I got confirmation yesterday that Godspeed was successful with the PWM control on the E92 ecu with his GM crate LT4.

[andrewb70]

Originally Posted by dontlifttoshift

Yes, control wire will go directly to the fan, no controller needed. You will have to change the frequency to 100hz for the spal fan instead of the standard 128hz that GM runs.

I may have that backwards, but there is a post in this thread regarding the frequency that the Spal brushless wants and it wasn't the same as GM.

Donny,

The genIV ECUs and C6 fan controller want 128Hz. I don't recall anywhere in this thread where 100Hz was called for, but I may have missed it. It would be great to get a definitive answer on this, since I am primarily interested in making the Holley Dominator work with the new Spal fans and I can easily change the frequency.

Andrew