1970 GTO Version 3.0

[andrewb70]

This is a small update with, hopefully, useful information.

Since the Holley EFI will be controlling the AC compressor, I wanted to use an AC pressure sensor. This is a little adapter that VA sells just for that purpose. Also pictured is a new VA dryer, where the fitting goes.



This is the AC pressure sensor that I am using. The main reason that I picked it is because I have the output configuration for it.



This is the new dryer, installed in its location on the radiator core support.



A lot of people ask me which oil pressure sensor I like to use on Gen 4 engines with Holley EFI. This is the one, and the connector on the Holley EFI harness has the correct connector. It is a 135psi sensor.



This sensor looks similar, but it has a 12mm thread on it, instead of the 16mm thread on the sensor shown above. I had this end cap for the Holley fuel rail, so I had an idea...



I told my idea to Vic and a little while later my idea was made reality.



Vic drilled and tapped the cap for the 12mm thread and a groove for the o-ring to seat against.



I installed it in the rear of the driver's side fuel rail. So I have a fuel pressure and temperature sensor after the fuel filter and this sensor in the rail, mostly because I can.



Vic is also making progress on modifying the dash insert to use with the Holley Pro-Dash.



The small hole to the right of the steering column will also get filled.



Andrew

[David Sloan]

Nicely done sir, this is what hot rodding is about, I love to learn new things from other car guys.
I’ve got to look in to that pressure sensor from the Ford F-250
Thank you sir

[wfo guy]

I hope Vic is enjoying this project. Many projects are just work. If the creativity to accomplish things is important, he should be happy.

[andrewb70]

Since I decided to rotate the Holley Lo-Ram base front to back, I needed to add a fitting for the catch can. Instead of using the typical NPT to AN adapter, I used this straight thread ORB adapter.



All that is needed is a little counter-sink for the o-ring to seal against. Sorted...



I needed a pass through for some wires to come through the firewall, low on the passenger side. This pass through is for wiring the heater control valve, fan speed signal, AC pressure sensor, EGT probe, and the dome pressure sensor.

I enlarged an existing hole to 1" using a step drill and...



used a TE Connectivity 90 degree heat shrink boot passthrough.



This is the 4 port, electronic heater control valve that I am using. It is sold by Thermotion. This will allow the coolant to flow through the heater core circuit when the valve is closed to shut the coolant flow through the heater core, when the AC is being used.



Vic also finished filling the holes in the dash. He then fixtures the dash in the mill to make the opening for the Holley 6.86" Pro-Dash.



Below the dash will be two of these VA dash vents:



Andrew

[andrewb70]

Yesterday Vic finished the opening for the Holley ProDash.



The Vintage Air vents will be here tomorrow, courtesy of Summit Racing.

Andrew

[ProTouring442]

On the third day of Christmas my true love brought to me...









This is the Terminator X Max system that will replace the GMPP ECU and harness kit. Given that my business now is tuning Holley EFI systems, it makes sense that I run what I preach.

The Terminator X Max will allow me to retain the DBW and also allow me to implement things like pwm fan control, and any other feature that I want to implement.

I also plan to take my time with the wiring. The Holley harness is ok, but some of the more visible parts are not up to a super clean look. The plan is to make my own injector and coil harness. Making those sub harnesses more like a motorsport harness and fully heat shrinking and labeling them. Some of the sensor branches of the harness may also get the same heat shrink covering. I also plan to integrate the alternator L and S terminals into the main harness.

More to come!

Andrew

Why the Terminator X over the HP system (https://www.holley.com/products/fuel...parts/550-604N)

[andrewb70]

Why the Terminator X over the HP system (https://www.holley.com/products/fuel...parts/550-604N)

You actually missed the update where I have a Dominator ECU now.

Andrew

[Larry R]

Making progress!

[andrewb70]

I am afraid that progress has slowed down a little. I am waiting on a local shop to get me in for the exhaust work and after that the car comes home.

In the meantime, the dash is done:



I may add a thin trim ring to the fuel level gauge, just to make it match the tach and speedo.

Andrew

[andrewb70]

I forgot to mention, the little slot to the right of the steering column is getting one of these:

https://www.molex.com/molex/products...ors/0795405067

Andrew

[ryeguy2006a]

Now that's cool! Will you be able to integrate that hub to your dominator? So all you'd need to do is plug the cable in there to make changes?

[andrewb70]

Now that's cool! Will you be able to integrate that hub to your dominator? So all you'd need to do is plug the cable in there to make changes?

It has nothing to do with the Dominator USB port. This is just a charger. I suppose I can install a USB bulkhead connector for the Dominator USB cable, but that's probably overkill. The ECU lives in the glove box along with the cable.

Andrew

[b17brian]

I forgot to mention, the little slot to the right of the steering column is getting one of these:

https://www.molex.com/molex/products...ors/0795405067

Andrew

How is that wired into the car? None of the supporting data shows the chord or how to wire it.

[andrewb70]

How is that wired into the car? None of the supporting data shows the chord or how to wire it.

There is a connector:
https://www.molex.com/molex/products...ngs/0347910040

and you also need the terminals:
https://www.molex.com/molex/search/p...a&query=560023

Andrew

[andrewb70]

I went over to Vic's today and did a bunch of little projects to get it ready for a move to Hotrod Express to do the exhaust system. I cleaned the underside as best as I could, installed the gas tank, tidied up any loose wires, and packed up all of the left over parts to take home.

While I was doing all that, Vic tipped up a trim ring for the fuel level gauge:






Some people had expressed a concern for a lack of trim ring, so there it is...

Andrew

[thumper877]

Definitely looks better with the trim ring

[OLDFLM]

Looks great! The material you covered the dash insert with is a nice touch too!

[btmatt]

good work. I don't know if you have mentioned before, but are you adding a switch panel to arm various features managed by the ECU?

I am finishing up a similar drag/drive project and contemplating a switch panel to arm transbrake, bump, line lock, 2 step, ECU MAP, etc. Are you doing something similar or have suggestions from other tuning projects.

Thanks, Matt

[andrewb70]

Definitely looks better with the trim ring

I think so too!

Looks great! The material you covered the dash insert with is a nice touch too!

It's the same vinyl that was used on the cover for the boost control solenoids.

good work. I don't know if you have mentioned before, but are you adding a switch panel to arm various features managed by the ECU?

I am finishing up a similar drag/drive project and contemplating a switch panel to arm transbrake, bump, line lock, 2 step, ECU MAP, etc. Are you doing something similar or have suggestions from other tuning projects.

Thanks, Matt

I am not adding any switches because I don't have a trans brake, or bump, or line lock...However, if you are interested in doing all that, it can certainly be done. Feel free to PM me and we can discuss it.

Andrew

[andrewb70]

The GTO took a ride to Hotrod Express this morning to have the exhaust system built.






To recap, the plan is to carry the single 4" from the downpipe, past the transmission crossmember. From there I have a Burns Stainless single 4" to dual 3" splitter, which then will feed into Dynomax UltraFlow Welded (PN 17547) large case mufflers and then tailpipes out the back with the OEM looking dual tips in the stock location. One of the 3" pipes will also have the exhaust valve installed before the muffler. This will allow me to effectively turn it into a single exhaust system for cruising on the highway. The exhaust valve will be controlled by the Holley Dominator ECU.

Andrew