It's an E38. 2009 Corvette Z06 with E-Force.

Ok, that makes much more sense to me. I was scratching my head as to what that wire was for. It didn't go anywhere else in the schematic.

Given the chart you have, I think there is a good chance that you could just connect the PWM wire of the fan directly to your ecu. It seems from your description and the schematics/datasheet that it may very well work. I can come up with a few reasons why it might not, but without having a setup to try and some tools to measure it, I can't say for sure.

From the graph you posted, there is nothing which indicates what frequency the Spal wants to receive natively. It shouldn't really matter that much, you will be off a little bit if your frequencies aren't exactly matching. But you can adjust your settings to get it to run and it will still cool.

I'd try it. :)

Hey Chris, your inbox is full.

I have a few left, anyone want one? $50 shipped.
Thanks,
Scot

I ordered a different radiator, ordered the C6 fan from Amazon, ordered some little clips/brackets from C&R Racing and went to town. The Monte radiator is a little wider than the Vette radiator, so couldn't weld the brackets to the tanks like C&R racing does. I did on one side & had to use some 1/8" flat stock on the other side. Gotta find the bolts/nuts yet to bolt it on.

Here is what It looks like:

http://i242.photobucket.com/albums/f...320_153534.jpg

http://i242.photobucket.com/albums/f...320_153540.jpg

http://i242.photobucket.com/albums/f...320_153550.jpg

http://i242.photobucket.com/albums/f...320_153610.jpg


http://i242.photobucket.com/albums/f...320_153456.jpg

^ that looks great Scot! :welder:

Props for staying with it and getting it done on this project :cheers:

That does look really good. I would be chicken to weld on a brand new radiator !

I am still a little confused from the prior posts. I am using an E67 ECM, vintage air Gen IV with sanden compressor and binary pressure sensor; and understand to use the AC Delco PWM controller.

I am clear on the ECM pin outs:

E67 Pinouts that need to be added are all on the J3 (grey) connector.
AC Pressure Sensor
J3-21 (ground) wire color black
J3-37 (5V) wire color grey
J3-57 (AC pressure signal) wire color red/black
PWM output
J3-49 wire color green

PWM Fan Control Module - AC Delco 15-80803
Pinouts
1) Fan (-)
2) Battery (-)
3) Battery (+) fused
4) Fan (+)
6) PWM output from ECM (J3-49)

AC Pressure Sensor from C6 Corvette
Pinouts
1) ground (connect to J3-21 on ECM - wire color black)
2) 5V (connect to J3-37 on ECM - wire color grey)
3) Pressure signal (connect to J3-57 on ECM - wire color red/black)


My confusing is with the C6 pressure sensor. Here is my question:

To what are you connecting the C6 Vette pressure sensor? Are you still using the the vintage air binary switch with the native wiring, or are you replacing the binary with a trinary and using the additional blue signal wire from the trinary switch as the input to J3-57; or are you keeping the vintage air binary switch and also adding the AC Pressure sensor? If so are you connecting it to the service port on the sander; or are you only using the C6 pressure sensor in place of the binary switch and connecting this to the vintage air harness as well as the ECM?

I sent mine back. Wires were too short to mount the module, I also noticed the shroud was warped. Would have lived with it, but not not being able to mount the module. Also notice the Connector & terminals are not OEM style.

I can't send mine back because I've already cut parts of the shroud. Mine is slightly warped as well and the wires for the connector are too short. I can't mount the controller on the shroud anyway because it interferes with the bottom outlet.

Yours looks perfect on the radiator!

Andrew

Is there a preferred position where the AC pressure switch needs to mount? Between compressor & evaporator, evaporator - condenser, or condenser - compressor?

anywhere between the condenser and evaporator. #6 line

Thanks,

This is helpful. Where did you install the trinary switch? Assuming that you also used it for the vintage air.

You don't want to use a trinary switch when the fan is being controlled by the ECM. You should use a binary switch to protect the compressor from over/under charge since the ECM doesn't control that.

I usually put it right into the drier. But if I can't inline on the high side hidden in the fender.

Yes, there should be an AC input wire right? Let me see if I can find the pin #

On the E67, the A/C request signal is via CAN request from the BCM, not a signal wire. :(

ECM fan request pins are a grounding circuit right?

To anyone that has an SRX fan, can you measure the blade itself for me? Using the eyecrometer it looks like the fan itself is 20" or more but I would like to have an actual measurement.

Thanks!

Has anyone found a decent price for the SRX fan? What prices are you finding?

Yes, in a non-PWM setup, the fans are requested by a ground circuit.

So with the GMPP controller (I believe it is an E67), there is no point adding the AC pressure sensor/switch? Unless the BCM is added?

It would be better if the A/C request went through the ECM so we could have compressor protection features (like RPM limit, WOT cutoff, overheating protection, etc.). But we don't, so all we get are fan control features via the A/C pressure sensor. Is it worth doing? I think so, but it isn't ideal, and the system needs a binary switch to protect the compressor since the ECM doesn't/can't.

If only Vintage Air or InfinityBox (nee ISIS) had support for GM's A/C CAN-bus request...

Fits like it was made to go there. LOL

http://i242.photobucket.com/albums/f...331_181253.jpg

http://i242.photobucket.com/albums/f...331_181247.jpg

Anyone else looking for one of these connector bodies for the PWM fan module? If so I will order a few more.

So what options does one have for integrating with an aftermarket ECM like in my case a FAST XFI? The FAST XFI ECM only has a negative relay control for fan on/off. I was reading about the Derale PWM controller but not a fan of the push in probe. Other options for a stand alone PWM?

http://derale.com/products/electric-...n-probe-detail

Sam,

Get me two… Thanks, Dirk

Good thread. I have a few questions...

I am running an E38 ECU and currently have it set up in discrete mode with a pair of spal fans. I understand that programming is required to switch to PWM mode. I also understand that a binary or trinary switch is required to control the vintage air compressor for over or under pressure conditions. My question surrounds the need for a high pressure signal from the a.c. system to kick the fans into high speed. Is it possible to let the trinary switch send a ground signal to the ECU to send the fans to high speed when the a.c. system requires it? I have an a.c. input from the speartech harness for an a.c. input. Otherwise I will need to wire in a second switch into the #6 line between the condenser and the evap.

Dirk, Not 100% if/when I will order them. If there is enough interest, i will, & I will let you know.
Thanks

Best solution is to use trinary switch to control compressor and AC pressure sensor connected to ECM to control fans through PWM control. No way to have both (and no need).

Whole set up is described in detail in prior posts.

Hope this helps.

Dave

Holley Dominator ECU and PWM fan control
 

One of the benefits of getting the Dominator ECU is the huge amount of user programmable inputs and outputs.

On this project I wanted to do with my current build is to have the fan be controlled via PWM. This can be done using the Dominator ECU and the C6 Corvette fan controller. I am using a C6 fan as well, but this can be done with other fans, including the popular Spal dual fan set-up.

Enjoy.





Andrew

Anyone have an E38 pinout to know where the pressure switch gets wired in? What kind does it take?

I'll dig it out of my 2007 Z06 book. Can't do it right now, will try for tonight.

According to my 2007 Y-Car (Corvette) Helms Manual, Vol. 2:

A/C Refrigerant Pressure Sensor Signal is C1-12
A/C Refrigerant Pressure 5V Reference is C1-34
A/C Refrigerant Pressure Low Reference is C1-13

Hope that's what you're looking for!

jp

Thanks...I need to dig into this further to see how far I want to take it.

Scot,

What do you what the connector is on the input side of the C6 fan harness? Is it a MetriPac 800?

Andrew

I found a connector in the junk yard in a car that had next to nothing left of it. I glanced in the engine bay and found it there on the fan. It has 2 large terminals for power and one smaller for the signal wire. So I grabbed it. No idea what the car was.

http://i242.photobucket.com/albums/f...519_213905.jpg
http://i242.photobucket.com/albums/f...519_213951.jpg

http://i242.photobucket.com/albums/f...519_214032.jpg

That looks different than the connector that came on the C6 fan, so I guess you just spliced it in?

Andrew

You are right Andrew, I heard of issues with the stock Corvette connector overheating & melting. So when I saw this one that has bigger terminals, I grabbed it to use. I took the connector apart, & opened the crimp on the terminals, removed wire attached wire from fan harness, crimped & soldered.

Weather Pack connectors are good to 20 amps -- after that you switch to METRI-PAK 480 series connectors which will handle 42 amps. There are other "series" which will handle higher loads but 42 amps per fan is plenty of surplus as they'll pull about 30 amps or less.

Greg,

Excellent segway...I just picked up some 3 cavity Delphi GT480 connectors. They are rated at 42 amps, as you said.

http://www.pro-touring.com/~andrewb/cougar/473.jpg

I will run my power (+/-) and the PWM wires to the fan controller through this connector.

Andrew