The 8HP90 that I picked up had a mystery converter in it. It didn't look stock and frankly I didn't trust it. So I called up Circle D and had a discussion about my requirements. Here is what they suggested:

https://j.hmjimg.com/2024/11/21/GTOV3-1038.jpg

This is their hybrid 8HP90 converter. Externally it is the same size as the 8HP70 converter, which is 1/2" smaller in diameter than a stock 90 converter, but internally it is built to work with the 8HP90 transmission.

Here you can also see the Domiworks bellhousing adapter.

https://j.hmjimg.com/2024/11/21/GTOV3-1039.jpg

and the Domiworks converter adapter.

https://j.hmjimg.com/2024/11/21/GTOV3-1040.jpg

Andrew

I had a little care package delivered today. Here are the fuel rail brackets, printed in stainless steel.

https://j.hmjimg.com/2024/11/29/GTOV3-1041.jpg


https://j.hmjimg.com/2024/11/29/GTOV3-1042.jpg

Tomorrow I will drill and tap as needed and maybe run the sides over some emery cloth on a granite block.

Andrew

I used a bench-top drill press and a step drill to open up the holes on the front and on the bottom.

https://j.hmjimg.com/2024/12/02/GTOV3-1043.md.jpg


https://j.hmjimg.com/2024/12/02/GTOV3-1044.md.jpg


Here they are mounted to the intake and holding up the fuel rails.

https://j.hmjimg.com/2024/12/02/GTOV3-1048.md.jpg


https://j.hmjimg.com/2024/12/02/GTOV3-1047.md.jpg

Andrew

:thumbsup:

That's really cool. Little things like that will be neat to point out to people at car shows etc.

Most people won't even notice.

Andrew

Here is the final raw, 3D printed aluminum charge pipe:

https://j.hmjimg.com/2024/12/06/GTOV3-1049.md.jpg


https://j.hmjimg.com/2024/12/06/GTOV3-1050.md.jpg


https://j.hmjimg.com/2024/12/06/GTOV3-1051.md.jpg


https://j.hmjimg.com/2024/12/06/GTOV3-1052.md.jpg


https://j.hmjimg.com/2024/12/06/GTOV3-1053.md.jpg

Andrew

I ran across some videos by Devin Vanderhoof. It seems that he too has discovered the Hardwire Electronics PDM products. In fact, he has become the biggest distributor in the US for Hardwire. As you may recall, I already have a PDM 25 under the dash, but after seeing the videos for the new PDM 28, I knew that's what I needed in the GTO. I will use the PDM 25 in the Cougar or the Suburban.

Here is the PDM 28 as it arrived.

https://j.hmjimg.com/2024/12/07/GTOV3-1054.md.jpg

The size of the PDM 28 is substantial. Here you can see it compared to the Holley Dominator ECU. They are roughly the same size.

The reason for choosing the new PDM 28 is that it has two CAN busses. With the release of the Holly CAN documentation, the PDM 28 is fully compatible with Holley EFI.

https://j.hmjimg.com/2024/12/07/GTOV3-1055.md.jpg

Holley had a 3D model of the Dominator available for download.

https://j.hmjimg.com/2024/12/07/GTOV3-1056.md.jpg

An email to Hardwire provided the 3D model of the PDM 28.

https://j.hmjimg.com/2024/12/07/GTOV3-1057.md.jpg

I once again used my Shining 3D Einstar 3D scanner and generated a scan of the GTO dash and glove box area.

https://youtube.com/shorts/mhHSHdmFs..._UB9Yk2dgtfszA


The plan is to design a mounting system for the Dominator and the PDM in the area that used to be occupied by the glove box.

Andrew

This has to be one of my favorite builds on this site


Sent from my iPhone using Tapatalk

Thanks for the kind words Marty.

If anyone is in the process of wiring their car, please post questions about the Hardwire PDM 28. This thing will basically handle all of the vehicle functions, although I made a conscious decision to leave the fuse panel and the bulkhead connector in place. However, the only thing that it will handle is the front and rear lighting. All other systems are getting moved to the PDM.

With the Holley Dominator and TurboLamik communicating over CAN, and now the PDM also on the CAN bus, some really trick things are going to be possible.

Andrew