Project`67 Dart GT 340 A500

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TrailBeast said:
It can be done later easily, so big deal there.
I used brass fittings and compression unions to plumb off the governor port and ran a steel cooler line up the back of the motor to a T then the two pressure switches attached to that and a bracket to bolt it to the back of the intake.
The stuff you see online for doing this is not speed adjustable and mounts down on the trans.
Since my switches are adjustable I wanted to access them from under the hood instead of under the car.

The two switches are actually made for nitrous systems and are called Fuel Pressure Safety Switches.
They are 30-70lb adjustable normally open 1/8 NPT electric switches From Jegs online.
Road speed relates real close to governor port pressure, so at 50mph your governor is putting about 50psi out on the governor port.
30-70lb relates to 30-70mph adjustable when used for this, so if you adjust the switch to 50lbs it will kick on your OD at 50mph.
They are for deactivating the nitrous if there isn't sufficient fuel pump pressure.
The way I used them was for when the trans governor pressure reached a certain pressure they would activate turning on the OD solenoid and LU solenoid, but at different pressures. (I set them so one switch activates at 55 and the other at 65)

I started with both switches turned as high as they would go so it didn't accidentally do something stupid like activating lockup in second or something. :D
Then I took it out and drove it, backing down on the switch that controlled OD first until it started shifting into OD at the speed I wanted. (55)
Then I did the same with the lockup switch until it was coming on at the speed I wanted.(65)

Now one more small complication.:D
I used part GM part number A74439A (6lb-22lb adjustable vacuum switch)
This interrupts the power to the lockup and/or OD when the engine vacuum gets lower from acceleration and kicks it out until manifold vacuum comes back up again. (like for passing or heavy throttle)
It is just a vacuum controlled kickdown if you will.

The switches inside the car just interrupt the ground for the two 12v solenoids that control the power to activate OD and lockup.

Let me know if you need more info or help with it.

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Trailbeast, you should come up with a kit for the A500, just like crackedback has the headlight relay kits. I bet you could sell a bunch of them. I know i would be interested in something like that for my kids car if it makes it almost a plug n play deal. I know one other fabo member locally that i have been talking to thats wanting to do the A500 swap and i believe he has your ignition setup in his ride already.
 
moparmat2000 said:
Trailbeast, you should come up with a kit for the A500, just like crackedback has the headlight relay kits. I bet you could sell a bunch of them. I know i would be interested in something like that for my kids car if it makes it almost a plug n play deal. I know one other fabo member locally that i have been talking to thats wanting to do the A500 swap and i believe he has your ignition setup in his ride already.
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I'm over building parts for sale, and it would be somewhat more than plug and play.
Not to mention that between the pressure and rocker switches, relays, wiring and cooler tubing involved it runs about 250 just in parts alone.
With that and the support and explanation on "how to" for everything I just can't commit to it.
 
hello junior congratulation for you project. I have a query, :) when you remove them from the tunnel / torsion support. do not unbalance up the car? thanks for you help
 
Broken windshield, no heater 30 degrees out , starter works sometimes, other than that perfect drive
20191024_092911.jpg
heading to work. Still smiling every time I drive Junior.
 
I love trailbeasts setup too. Would love to duplicate that. However if not, do you have a schematic you can share as to how you wired up yours,
 
Check out PATC transmissions site. They have a set up much like trail beast for 88 bucks. Its almost exactly what I did so I know it will work. Cheaper than what I scrounged parts for too!

Cley
 
I like other ways and ideas of wiring , personally I prefer my simple toggle like in #21 post in my thread.
Keep the ideas rolling people I love it.
Such fun cars.
 
Hi Andy. Never did find out about Jr's steering box. I need to go to manual sometime, my PS is shot. I missed out on a cheap manual box locally...hard to find.
 
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