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  #11  
Old 12-14-2011, 02:31 PM
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The fan I am using is an OEM ford fan. here's a shot of it sitting on the stock '94 radiator.



If it doesn't work, then I will switch to the mechanical fan.
Yep, those fans fit well and move a lot of air, that's why folks like them
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  #12  
Old 12-14-2011, 03:02 PM
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Also forgot to mention - integrating the toyota AC system. This will be a bit more challenging but I think I found a solution for this as well. I have to have a custom discharge and suction hose made up so that they will fit the toyota condensor and evap ports on one side and the denso compressor on the engine side.
So you're planning on using the Toyota A/C compressor on the GM engine?! Will the same brackets work for mounting it?! I don't get it...
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  #13  
Old 12-14-2011, 03:08 PM
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I want to drive it when you're done. Can't believe you're doing this with a full time job and triplet 2 year olds
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  #14  
Old 12-14-2011, 03:26 PM
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I want to drive it when you're done. Can't believe you're doing this with a full time job and triplet 2 year olds
I agree quite a feat!!

I had custom hoses made for my rig and used the Toyota evaporator and condensor alone with the gm compressor. It works pretty well. The ac idle up uses a separate computer from gm to control it so I never hooked that up. I do use the stock Toyota controls to cycle the compressor though.. The pressure, temp, and rpm switch. I am sure you can do something similar in the 80.
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  #15  
Old 12-14-2011, 07:05 PM
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Can't believe you're doing this with a full time job and triplet 2 year olds
He is going to quit his job and do this for the rest of us once he has it all figured out
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  #16  
Old 12-14-2011, 09:33 PM
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So you're planning on using the Toyota A/C compressor on the GM engine?! Will the same brackets work for mounting it?! I don't get it...
I will use the GM compressor (it's actually a denso because they are the oem supplier for gm). The adaptation comes from the line sets.
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  #17  
Old 12-14-2011, 09:36 PM
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I agree quite a feat!!

I had custom hoses made for my rig and used the Toyota evaporator and condensor alone with the gm compressor. It works pretty well. The ac idle up uses a separate computer from gm to control it so I never hooked that up. I do use the stock Toyota controls to cycle the compressor though.. The pressure, temp, and rpm switch. I am sure you can do something similar in the 80.
supposedly the vortec pcm will sense the drag from the compressor and self compensate the idle. There is an input to tell the pcm the a/c is on but it's a CAN input from the body module on the gm truck so no dice trying to make the toyota a/c amplifier tell the pcm the a/c is on. I will have an input to the fan relay set to trigger a small pusher fan mounted in front of the condenser to help with low speed a/c performance.
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  #18  
Old 12-14-2011, 09:39 PM
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He is going to quit his job and do this for the rest of us once he has it all figured out
oddly, I used to work for the now-defunct Avalanche Engineering when the shop was still at the grandview location (right next to Sal's Motor Corral). It got old doing it to make a living so I got a real job when I moved to Florida back in 1998
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2004 Kona Stinky dee-lux.
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  #19  
Old 12-15-2011, 07:38 AM
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supposedly the vortec pcm will sense the drag from the compressor and self compensate the idle. There is an input to tell the pcm the a/c is on but it's a CAN input from the body module on the gm truck so no dice trying to make the toyota a/c amplifier tell the pcm the a/c is on. I will have an input to the fan relay set to trigger a small pusher fan mounted in front of the condenser to help with low speed a/c performance.
What is a PCM? I didn't realize the compressor speed can be modulated based on idle speed.

This maybe a crazy question but has anyone considered using an electric motor to power the A/C compressor instead of using the engine power? You could then use the Toyota compressor and still get the constant speed you need and not have to purchase custom hoses etc. I've seen electric motors for the Water Pump for GM trucks - is there such an option for A/C compressor, I wonder?
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  #20  
Old 12-15-2011, 08:27 AM
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The PCM is the powertrain control module (or the engine computer). GM calls it the PCM, others call it the ECM.

The compressor turns at engine speed whenever the clutch cycles on and stops turning when it cycles off. The clutch is commanded by the toyota a/c amplifier.

The PCM controls the idle speed and therefore if you are standing at a stop light and the a/c clutch is activated, the increased drag from the compressor will be sensed by the PCM and it will automatically compensate and maintain idle speed. GM does use some compressor that are designed to be variable output - they don't ever cycle on and off but rather control the output of the freon pressure internally. The trucks (fortunately) don't use these compressors.

Yes - there are some cars (mainly hybrids) that use an electric motor to turn the a/c compressor instead of the gas engine. I know it sounds like a big challenge but doing custom hoses to adapt over to the gm compressor really isn't that big of a deal.
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