A 5th gen camaro e38 os will not support pwm. But a truck e38 os will. Also the e92 silverado controller will only support pwm at 100hertz. No discrete on the new stuff factory os.. The gmpp e92 controller will support discrete only. Its all super confusing and testing is the only way to know for sure. Lot of misinformation out there. I use an oscilloscope at work to see the signals. To get ac control the computer needs to get a serial on request from the bcm. We have a module the sends that signal along with tap shift commands for gen iv and gen v. This control the fan based on ac pressure as well. Works perfectly.

Thanks for the reply. I figured out the camaro OS won't do it. However, the Spal fans come with their own PWM controller built in so it was a non issue. They come on around 165* and by 185* are full speed.

Spal fans with built in PWM controller? Could you post a part number and/or some details?

Thanks,
Don

Spal with PWM controller
 

All of the DC brushless Spal fans (and most other brushless DC [BLDC] fans) have a built in motor controller. This is required because you can't just PWM the power to a BLDC motor - you need to control each coil in order to start the motor and control the motor speed and then you need to monitor the feedback in a sensorless motor to know speed (or have a separate speed sensor).

Spal offers temperature sensors that output the frequency and duty cycle signals the BLDC Spal fan is expecting to see. NOTE - two different control logic configurations exist in the Spal aftermarket and OEM BLDC fans. Spal makes two different versions of the temperature sensors for this reason. Make sure you get the correct sensor for your fan type.

Other companies also make devices that can read a conventional temperature sensor (and in some cases other sensor signals) and then output the PWM and duty cycle signal the BLDC Spal (and other) fans are looking for.

Some heavy duty truck and industrial brushless motor fans require an external brushless motor controller. I am not aware of any current OEM passenger light duty vehicles that use this type of brushless fan control configuration though.

The Spal brushless DC fans are looking for a PWM signal that is a low level speed control signal. You are not actually connecting directly to the motor on these fans - you are connecting to the motor controller that is built into the motor assembly. These types of fans usually have 3 or 4 pins. Two small terminals and two much larger terminals. One small terminal is the speed control signal input, the two larger terminals are the high current power and ground and the fourth (if it exists) is a diagnostic signal wire. In most systems you do not have to connect anything to that fourth wire for the fan to operate correctly.

Because this speed control signal is a PWM signal people often confuse this with PWM control of a conventional brush type fan which is not at all the same. In PWM controlled brush type DC fans you are turning on and off the power to the motor at fairly high frequency so the device performing the PWM of the power has to be able to handle high current loads.

In the BLDC fans the PWM speed control signal is a low level speed control signal so it is very low current. All of the motor drive current is on the main two power wires that are connected directly to the battery (usually with a fuse but without a relay).

This is what the invoice shows:
7-30107102 - 14" Spal Drop In Sealed Brushless Puller Fan (Plus Series) 500W 50Amp Maxi Fuse 2395 CFM

7-SBL-TS-HARN - SPAL Brushless Fan Interface Harness Kit

7-SBL-TS185P - SPAL Brushless (Plus Series) Temp Sensor-12V/24V (Minimum "on" Speed at 165 Degrees / Increasing to 100% "Full" Speed at 185 Degrees

7-SBL-YAZ-PT10 Brushless Fan Jumper Harness PigTail Yazaki Connector For Drop

The temp sensor was $145 alone

I bought a complete radiator setup with shroud, two fans, wiring, etc from Wizard Cooling in New York.

I had to reroute the cold side piping on my turbo setup because the new radiator was thicker than the OEM radiator.

So I would like to run 2 spal brushless fans on my C10 build running an E92. I currently have A GMPP kit.
So with all this, it looks like need to track down a Silverado ECM and transfer the program from my GMPP controller?

Has anyone gotten one of the 2017 CTS-V / Camaro fans to work? I bought one and I'm trying to to get it to work with my 2010 Colorado E67. I changed the fan settings to PWM EV, and 100 hz, but I can't get it to do anything. Does anyone have any details on getting this fan to work. It should be a sweet fan if I can get it working.

Is anyone running the C6 fan controller, E38 ECU, and a trunk mounted battery? I'm running OS 12628990 from a 2009 Vette, have set my fan to PWM Electric and adjusted the fan % with EFIlive (keeping max % at 89.9%).

As the car warms up, the fans will come on to a low setting for about 5 seconds and then turn off. The fan will not stay on as coolant temp rises, and I'll shut the car off around 225F as the fan are not operating properly.

Did you run the C6 fan controller power directly to the trunk mount battery and not to an underhood 12V distribution block? I have mine run off a 150amp circuit breaker /distribution block with a 60amp inline fuse between the controller and distribution block. The other side of the breaker is wired to the alternator.

Does anyone know if the PWM frequency can be adjusted with EFI live? I had a Delta Current Controls PWM controller with engine bay mounted battery and it worked well with the same dual Spal fans last year.

Thank you!

2018 LT4 Connect and Cruise
 

I am trying to use a Factory ZL1 camaro fan. I have vintage air as well.

Any one have any success controlling the PWM fan as intended?

Thank you in advance.

Thom

Thom,

I have no direct experience with what you are doing, but I have some educated guesses. From what I understand, the ZL1 fans have the controller built into the fan. The connector (Yazaki) has two large pins for power and a small pin for the PWM signal wire. Again, from what I understand, you should be able to configure the ECM to send a PWM- signal to the fan and it should work. I would use the same settings of 128Hz and input the duty cycle table as with the C6 Corvette application.

Andrew

Thom is using a E92 ECU that came with a GM LT4 connect and cruise. That ECU and harness is set up for two discrete outputs and are already wired to relays in the Chevrolet Performance fuse box.

I also want the answer to this for this application.

Just so it is all on the same page.

I wish I had one of these fans to experiment with. I'd like to see if they would work with the Holley ECU.

Andrew

I don't see why it wouldn't, it wants the same PWM signal.

The crew at V8 Speed said on a FB post that the GMPP E92 for the LT4 is programmable to run a pwm fan signal.

I am waiting for a couple of corroborating experiences, it is costly to undo.

https://www.ebay.com/itm/2012-2015-C...AAAOSwuNFbeH16

Likely won’t find one for any less....

Don

Don,

That looks like one of the fans from a 5th gen Camaro. I believe that if we are talking about the e92 ECU, then that would be the 6th gen Camaro...

Andrew

Sorry...

Don

No need for apologies. I am just trying to keep all of this information as accurate as possible. We're all learning here...LOL

Adapting new OEM parts to our old clunkers is not easy, but I think there are many benefits to be had. As I understand it, the new fans are quite amazing!

Andrew

You know we're in deep when we're using words like AMAZING to describe cooling fans... LOL

Geeks-R-Us...LOL

In all honesty, PWM fan control adds a great deal of refinement out our old cars. The information from this thread allowed me to implement it on my Cougar build and it truly is AMAZING! On my GTO, I am using dual Spal fans with binary fan control. The car has a relatively quiet exhaust and when the cooling fans turn on, it sounds like a jet engine.

On the Cougar, I never hear the fan, ever, and I have yet to see it go much above 50% duty cycle even on hot summer days. The C6 fan is rated at 400watts, while the new 6th gen Camaro fan, I believe is 800watts! So yes, amazing.

Andrew

I hear that. I'm running the dual SPAL fans on my car and with traditional relays the fan noise is very loud even with a loud exhaust and the shock to the charging system when they're switched on is significant.

I'm anxious to get the PWM setup once I get my Terminator installed and running.

Modern refinement is really what distinguishes some of these builds.

Keep the info coming. It's AMAZING. Lol

What module do you use? BCM?

Doing the PWM conversion. Would like to get the A/C fan request working.

2015 Camaro L99 6l80 e38 will PWM work on spal brushless 12" twin fans?
 

Was you able to get this working?

I am installing the following setup in my 1976 Blazer.

L99 DOD delete with 6l80e from a 2015 Camaro

I have 2-12" Spal Brush-less fans part numbers 30107087 VA89- ABL320P/N-94A

I also have vintage air.

Looking at the wiring diagram for the brush-less fans it appears that they do not run throw a relay. It says to just install a 40 amp Maxi Fuse.


I am wanting to hook these up to run PWM so that they are variable speed like a new car. I would like the fans to be controlled by my e38 ecm. I am also installed a pressure transducer on the ac line.


With the 2 fans do i need 2 controllers?

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

So will the 2015 Camaro ECM put out a PWM signal?

Be great if it can go direct to fans with no control super simple that way.

I do not know. I am not that familiar with the intricacies of the OEM ECUs. I'm sure someone will chime in.

Andrew

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.

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.

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

Andrew, bolding mine.

Thanks Donny!

I follow this thread closely, but somehow I missed that video!

Looks like those new Spal fans with the controller built in would be easy with the Dominator! I am always looking for cool, new stuff for future builds!

Andrew

Anyone know what PWM voltage the ECM is outputting? 5v, 12v?

Thinking I may tackle it as an arduino project as I have GMPP LT4 controller.

Stan

I'm definitely not an expert, but from my countless hours researching I believe it is 5V:)

Lonnie

Stan,

It is PWM- so it is pulsing to ground.

Andrew

Thanks Andrew for setting me straight! You have forgotten more on this subject than I'll probably ever know:) The 5V most be the a/c pressure sensor?

The voltage swing of the active low PWM signal would be determined by the voltage the pull-up resistor etc is connected to. If you connect it to 12 volts you will get a 12 volt signal.

Don

Wow, what a great thread with a wealth of knowledge from multiple contributors!

I'm very intrigued by this.

From what I've read, can you use the Spal brushless fans alone with PWM control without having to use the controller from the C6 or Ford Fusion?

I'm referring to post #445 from Blake-B.

Is the controller built in to the fan motor?

Thanks!

A few people have asked me if I had any more of the connector kits for the Corvette PWM module. In the past I had kits that is the connector body, 4 large high amp terminals & seals, a small terminal & seal for the signal, & some blank plugs for the open holes. I am trying to get all the parts for the other connector that is 2 high amp terminals & one small terminal so the fan assy can be easily removed if needed.

If I was to order more to make these kits, who would be interested in them and would you want all mentioned above, or just the connector for the module itself?

Not sure yet what price would be until I find out what they are charging me. In the past I sold them for $50 shipped for the module connector kit alone. I probably can do it for less if enough ordered.

http://i242.photobucket.com/albums/f...820_153531.jpg

Trying to find both sides of this connector too:
http://i.imgur.com/yM7wHTIl.jpg

Sam, I think this is what you're looking for: https://www.amazon.com/replacement-C...teway&sr=8-130
https://www.amazon.com/Replacement-C...ateway&sr=8-49