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high side switch port suggestions

Rodder on Tue June 03, 2008 1:39 AM User is offline

Year: 1968
Make: Camaro
Model: Vintage Air Gen-IV
Engine Size: LS1
Refrigerant Type: R134a
Country of Origin: United States

Hi everyone. I'm looking for suggestions on the best way to add an M10x1.25 switch port (male) to my system. I'm using an SD5H14 compressor with #8 O-ring discharge port, and I haven't assembled my hoses yet. The hose fitting I currently have for the discharge port is a 135degree with an R134a high side service port welded in the side. Somewhere on the high side I need to run a '99 Camaro AC Refrigerant Pressure Sensor so that the LS1 PCM can properly control the compressor, fans, and IAC. And I better off using some type of T-splice in the hose, welding an M10 switch port bung to what I already have, using some kind of adapter to replace the (male) binary switch in the dryer, or some other combination of fittings? The original application appears to have a shraeder valve inside of the M10x1.25 so that the sensor can be replaced without recovering the system.

One more question... the Vintage Air kit came with a binary switch for 30psi/406psi. The LS1 PCM will disengage the compressor clutch outside of 30psi-410psi. Does anyone see a reason to run the binary switch if I am providing the same functionality through the PCM?

bohica2xo on Tue June 03, 2008 2:55 AM User is offline

If you are keeping the LS1's PCM, why not keep the V7 compressor with it? Variable displacment, high capacity...

The PCM does not cycle the V7 compressor that came mounted in a '99 5.7L Camaro. The V7 reduces refrigerant flow to maintain evaporator pressure, and prevent freezing of the evaporator.

Are you hooking this up to the OEM a/C sytem in the '68?

You will have more capacity with the V7, equal to the A6 that came in that car originally. The control valve in the V7 does the same job the POA valve did in the '68. A V7 / TXV system is a powerful cooler.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

Rodder on Tue June 03, 2008 10:45 AM User is offline

This is a non-AC car, and I'm using a Vintage Air GEN-IV evaporator and controller. The VA controller cycles the compressor. Normally VA's compressor relay output would drive the compressor clutch via the binary switch. In my setup, I'm going to run VA compressor relay output to the AC Request input of the PCM, and let the PCM drive another relay to drive the compressor clutch. The PCM will do the duty of the binary switch, as well as control my fans and tweak my spark advance and idle air control.

The factory V7 mounting location puts the compressor in the same space as my subframe and right engine mount, so I have to mount the compressor up on top (kwikperf.com brackets for the Sanden). I've also been told that the V7 won't work with VA's expansion valve.

Does what I'm trying to do make more sense now?


Here are a couple of pictures:



bohica2xo on Tue June 03, 2008 11:14 AM User is offline

If you are running the V-A controller, then you need to run their switch.

Adding the sensor for the PCM is a good idea, especially if you want it for radiator fan control. The compressor control should remain with the V-A unit.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

Rodder on Tue June 03, 2008 11:30 AM User is offline

Any suggestions on how to add the '99 AC Refrigerant Pressure Sensor (needs M10x1.25 fitting) to the system?

bohica2xo on Tue June 03, 2008 4:12 PM User is offline

This should do it

Or the same port is available on most other hose ends. I would put it between the compressor & condensor, the highest pressure spot in the system.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

Rodder on Tue June 03, 2008 4:40 PM User is offline

35-B6101-1 looks like it's a 1/4" R12 service port in the middle of a #6 beadlock splicer.

If I go the splicer router, I'll need an M10x1.25 switch port in the middle of a #8 beadlock splicer. Omega 35-B6191 looks like it might be the right piece, but the online Omega catalog doesn't say what size the switch port is.

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