Holley Dominator CAN Bus protocol type?

[RobertoGonzalez]

Need to know what's Holley EFI Dominator CAN Bus Protocol Type? Example: J1939.

[Danny Cabral]

Contact Holley Tech Service (LINK).

[RobertoGonzalez]

Thanks, Danny!

[rscocca1]

I've been waiting for a reply to this question from Tech Support, anyone know?

[FuelieNova]

My guess is, good luck getting it. Tom

[S2H]

Proprietary, not a standard SAE protocol.
CAN Bus just means Communications Area Network.
Holley uses its own language.
This has been covered many times on this forum & several others.

[Danny Cabral]

Holley does not disclose its proprietary CAN Bus protocol.

[Bigfella237]

Contact Holley Tech Service (LINK).

Don't waste your time, they refuse to release any information whatsoever, although they seem happy to release it to the NHRA.
I found this PDF document entitled "2016 PRO STOCK ELECTRONIC FUEL INJECTION TECHNICAL DOCUMENTATION",
which details Holley's CAN protocol from page 80 onward: http://www.nhra.com/UserFiles/File/T...tions_Rev1.pdf
Forum Admin, please note that it says "Holley Performance Products - For Public Release" on the lower edge of the pages.

[S2H]

The data there is CAN ID numbers for Racepak dash & dataloggers, since most of the NHRA guys are using Racepak stuff. It does not tell you the protocol or how to translate it.

[Danny Cabral]

Also, that Pro Stock EFI Tech PDF document was released shortly after my post #2. If you'd like to submit a formal complaint, call Holley Tech Service (LINK).

[radrace19]

I just plan to use the NHRA info, and change the CAN Bus output to Racepak for my usage. That should work just fine.

[Bigfella237]

From what little information I can find, it appears the "Holley Standard" protocol and the "Racepak" protocol are basically the same as far as the ECU is concerned. It's just that the Racepak setting reduces the number of parameters broadcast considerably. Then that little dongle thing that comes with the Racepak dash, supposedly translates all the info broadcast by the ECU into their proprietary language called "V-Net", which is a totally different protocol again.

Holley uses the extended CAN protocol with 29-bit headers and a fixed 8 byte payload, whereas V-Net uses the standard 11-bit headers, which typically allow for variable length payloads.

"Racepak" broadcasts 40 fixed engine parameters, plus 5 inputs and 5 outputs, while "Holley Standard" broadcasts 100 fixed parameters plus the 12 I/Os from the LCD. However I believe that the ECU can also broadcast information about the custom I/Os as well, but I have yet to confirm this (Dominator has 80 custom inputs & 62 custom outputs).

By using the Racepak protocol, you won't get any of the learning or tuning information, nor electronic transmission or DBW info, and it looks like there's quite a few boost, N2O and W/M parameters missing too.

[rscocca1]

So I guess my next question would be, what are the other CAN drives supported? (For Racepak and other external CAN drives.) Or did I just waste a lot of coin for a system that will not talk to my other CAN systems (AIM Steering wheel, CAN based Gauges)?

[S2H]

So I guess my next question would be, what are the other CAN drives supported? (For Racepak and other external CAN drives.) Or did I just waste a lot of coin for a system that will not talk to my other CAN systems (AIM Steering wheel, CAN based Gauges)?

YOU assumed that CAN means some universal language that everything uses.

CAN simply means Communications Area Network. It is strictly the phone line between 2 devices, nothing else.
It is up to each device manufacturer to make the piece understand what something else is transmitting.
Example being I speak English, but if I call Russia, and the person on the other end only speaks Russian,
then they wont understand what I am saying, and vice versa. Same applies to devices with a CAN Bus.

Holley only Supports Holley devices, period.
Holley CAN Bus only outputs data to Holley Devices (LCD Touchscreen, 7" Digital Dash, 3.5" Handheld Programmers).
Racepak took it upon themselves to be able to read the Holley Data, because they knew that people who had BS3 systems were switching to Holley, and they didn't want to lose any business for their IQ3 Dash & V-Net Datalogger. Holley added a special Protocol to allow the data to be seen by the Racepak devices.

An example of the Holley/Racepak relationship. I can speak English, and a small handful of German words and phrases, just enough to get across the information I want to tell a German person. Holley being English, Racepak being the German in this example. Holley outputs minimal data in a Racepak format, so that some of the Racepak devices can be used.

[Danny Cabral]

Or did I just waste a lot of coin for a system that will not talk to my other CAN systems (AIM Steering wheel, CAN based Gauges)?

Holley EFI has never suggested or advertised their CAN Bus to be compatible with customer's devices (from other manufacturers).