PWM cooling fan(s) control using ECM

[mikels]

Originally Posted by parsonsj

Here's my question: can Dave or Mark or somebody post the pinouts for the ECM (E67) so I can add a

1. engine oil temp sensor, and
2. GM A/C pressure sensor, and
3. 2nd fan control wire.

Thanks!!

Originally Posted by parsonsj

More information about my harness: both high speed (pin 54/connector 1) and low speed (pin 49/connector 3) fan controls are connected to the same single fan relay.

The A/C sensor is not connected (pin 57/connector 3, I believe). I can't find any information about engine oil temp.

LSA and LS9 engines utilize the I/O channel that is sometimes used for oil temperature for IAT2 (post intercooler Intake Air Temp). There are no additional I/O channels to take in engine oil temp on the supercharged engines.

A/C pressure sensor wiring is correct - and can be adjusted to fan driver output based on A/C head pressure. Remeber - highest requested fan driver percentage wins.

E67 controller has 3 fan output drivers - however, when used with PWM fan control, only one of those outputs is utilized. It provides a PWM output at frequency specific to the fan driver controller. I've not measured voltage based on PWM % output to determine what way the voltage goes based on desired output.

When fan drivers are used as discrete outputs, they can be used to close relays that can then be wired in parallel, series or parallel series combination to drive mutliple fans at low and high settings.

I'm a huge fan of PWM cooling fan control as I HATE listening to high speed fan during anything other than track situations that demand it. Nothing worse than pulling up and having the sweet rumble of an engine masked by a fan screaming away.

[samckitt]

Can all of this be programmed into the GM Performance Parts LS2 controller?

[mikels]

Originally Posted by samckitt

Can all of this be programmed into the GM Performance Parts LS2 controller?

Yes - All GMPP crate engine controllers are E67's and can be programmed for fan control in same manner.

[CFster]

Originally Posted by mikels

Yes - All GMPP crate engine controllers are E67's and can be programmed for fan control in same manner.

You're forgetting E37, E38 and E40 ecus.

[parsonsj]

Originally Posted by Dave

E67 controller has 3 fan output drivers - however, when used with PWM fan control, only one of those outputs is utilized. It provides a PWM output at frequency specific to the fan driver controller. I've not measured voltage based on PWM % output to determine what way the voltage goes based on desired output.

When fan drivers are used as discrete outputs, they can be used to close relays that can then be wired in parallel, series or parallel series combination to drive mutliple fans at low and high settings.

I'm a huge fan of PWM cooling fan control as I HATE listening to high speed fan during anything other than track situations that demand it. Nothing worse than pulling up and having the sweet rumble of an engine masked by a fan screaming away.

Me too on PWM control.

So... net net: I need to use a C6 fan controller since it is definitely compatible with the E67. For dual fans, I need to use two controllers, and hope that the E67 can drive two PWM controllers from the same wire.

[mikels]

Originally Posted by parsonsj

Me too on PWM control.

So... net net: I need to use a C6 fan controller since it is definitely compatible with the E67. For dual fans, I need to use two controllers, and hope that the E67 can drive two PWM controllers from the same wire.

I've run 2 fans with single PWM C6 fan controller (have to look at total power demands and keep in limits of fan controller) and know that works.

Lou is trying dual PWM modules controlled by single PWM output from ECM -will know soon the success of that route.

[parsonsj]

Originally Posted by Dave

I've run 2 fans with single PWM C6 fan controller (have to look at total power demands and keep in limits of fan controller) and know that works.

Lou is trying dual PWM modules controlled by single PWM output from ECM -will know soon the success of that route.

OK, that's good to know. I'm using the C&R Racing setup with their dual Spal 11" fans.

Is that the fan setup you know works?

[mikels]

Originally Posted by parsonsj

OK, that's good to know. I'm using the C&R Racing setup with their dual Spal 11" fans.

Is that the fan setup you know works?

Corvette fan is 400W - so at 12.5 V, that's 32 A. So long as your 2 Spal fans are below that current level, should work fine.

[samckitt]

Originally Posted by mikels

Yes - All GMPP crate engine controllers are E67's and can be programmed for fan control in same manner.

Anyone have a PN & source for the connector terminals?

[parsonsj]

A quick check of the dual 11" Spal fans shows current draw less than 32A.

Looks like I'm golden!

Thanks all!

Originally Posted by Scot

Anyone have a PN & source for the connector terminals?

x2, and looking for cavity plugs too. I've heard reference to "micro 64 connectors".