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Holley Hp / Dominator Adjusting The Tcc Lockup Control on a GMC Syclone

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This article covers on how to set up your TCC Lockup Control when using the Holley HP Dominator Engine Management System. Hat tip to Randy Merritt for the original writeup and pictures.

The default Holley setup controls TCC lockup by RPM and TPS. If you would wanted the lockup to be tied to vehicle speed follow these instructions.

Adjusting TCC Setting

1

With the Holley system up and running, select the TCC lockup screen under the Basic I/O tab on your left. In the pic below, you can see it does not allow speed to be used as a parameter for lockup like the stock computer or Code 59.

Image 5297 from Holley HP / Dominator Adjusting the TCC Lockup Control on a GMC Syclone
2

To set up the system to receive a digital speed signal from the DRAC, use one of the inputs on the Holley. Tie into the light blue/black wire coming out of the DRAC with a simple wire splice connector. This wire goes to the speedometer. It is wire 824 in this picture.

Image 5300 from Holley HP / Dominator Adjusting the TCC Lockup Control on a GMC Syclone
3

Here is a blurry pic (sorry!) of the splice at the DRAC.

Image 5303 from Holley HP / Dominator Adjusting the TCC Lockup Control on a GMC Syclone
4

Next, configure the input settings on the Holley to read digital speed.

Image 5306 from Holley HP / Dominator Adjusting the TCC Lockup Control on a GMC Syclone
5

Here is a shot of the "CONFIGURE" settings that I used. I can't tell you why they worked, but after much trial and error, these settings give a speed that is read by the Holley that is very close to the speed on the speedometer. Your setting may have to be adjusted slightly based on tire size, but this should be close.

Image 5309 from Holley HP / Dominator Adjusting the TCC Lockup Control on a GMC Syclone
6

Now goto the Pin Mapping in the Holley to accept the input at the proper channel and type of signal.

Image 5312 from Holley HP / Dominator Adjusting the TCC Lockup Control on a GMC Syclone
7

Now on to the output. The TCC is engaged by a negative trigger. This is how jumping the ALDL with the upper left and upper right pins on the ALDL will force the TCC to lock up. I did another splice into the upper left wire going to the ALDL. This is the pin that controls TCC lockup when grounded.

Next, I configured an output channel that would provide a negative trigger when certain parameters are met (i.e., when I wanted the TCC to lock)

Image 5315 from Holley HP / Dominator Adjusting the TCC Lockup Control on a GMC Syclone
8

Then configured the Pin Mapping to have the proper output signal (ground or G)

Image 5318 from Holley HP / Dominator Adjusting the TCC Lockup Control on a GMC Syclone
9

Here is a shot of the "CONFIGURE" screen in the "OUTPUTS" area of the Holley program. These are the conditions I set for lockup, and it works great. It is also very easy to change them. I did not use any relays of any sort, as after conversations with others smarter than me, it was determined that the Holley is capable of directly grounding the TCC with out risk of harming the Holley.

Image 5321 from Holley HP / Dominator Adjusting the TCC Lockup Control on a GMC Syclone

There are 2 Comments.

Say Something.

I'm trying to do the same thing on a 91 k1500, using the 2000 ppm dc square wave signal from the DRAC module. This write up is very informative, however lacks the info I'm looking for. Specifically how to configure the input settings.

Author only says:
"I can't tell you why they worked, but after much trial and error, these settings give a speed that is read by the Holley that is very close to the speed on the speedometer. Your setting may have to be adjusted slightly based on tire size, but this should be close."

I was hoping the author could elaborate more on that subject, or any input from someone else who has accomplished something similar. For instance, what was the signal that was tapped into, my speedo is 4000 ppm DC? Thanks Bob

reply:

Bob - The content of this article was transcribed from a fellow truck owner. I will contact him to see if I can aquire the details to the input settings.

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