LTX and LSXPutting LT1's, LS1's, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects, including repairs, swap info, and performance upgrades.
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I am using everything 3rd gen and the 4th gen compressor, What all do i need to do as far as wiring to make this work? The 3rd gen compressor had two connectors on it and a connector on the low pressure line. The 4th gen compressor only has one connector for the clutch.
You will get other answers but it can be done very simple if you want. The LS PCM really only needs 1 thing (this is where most will disagree), it needs to know when the compressor is on. Though the PCM can manager the compressor for you the 3rd gen AC is self contained and if you connect the power from the compressor to the PCM (I'll have to look up the pin) it will handle turning on the fan and adjusting the idle. Yes, one wire.
SO my route is to hook up the a/c just like factory and run the power from the compressor to the PCM. Its the pin that tells the PCM when the compressor is on. Even if you wire it up with all the sensors and stuff the PCM still needs that final thing...to know that even if it thinks the compressor can turn on it has to know when the compressor is actually on and therefore can(and does) ignore everything else.
No. The compressor clutches work the same pretty much. Put 12v to the clutch, the AC starts pumping. Take the 12v away, and the cycle stops. If you retain all the other thirdgen parts, the high/low pressure switches handle the cycling.
If you use the 3 wire sensor from the 4th gen setup, the PCM handles all of that. Works either way though.
J.
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ARE shortblock, Ross custom boost pistons, arp rod bolts, ARE ported oil pump,
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So do i need the pressure switches or remove them? The high pressure switch was in the compressor so where would i mount another one? Also the low pressure switch was wired through the factory computer so where do i run the grey wire now?
From what i've heard, you do need to run the three wire high pressure switch if you are letting the ls1 pcm handle it. There should be a place on the high side line to run the ls1 3-wire high psi switch.
What are you using? Are you using all the stock 3rd gen parts...then the LS1 compressor? Or are you using LS1 sensors and parts?
If you are using all 3rd gen lines and parts, and using the LS1 compressor, you should just leave it all alone and wire the LS1 compressor in place of the original. As far as I know there was no high pressure switch in the compressor... The high pressure switch is in the lines on the high pressure side. Thats how it is on most systems that Ive ever worked on...
All 3rd gen and 4th gen compressor. There was two plugs going in the old compressor one for the clutch and i assumed a high pressure switch on the back of the compressor. Then there is another plug that goes on a switch in the low pressure line.
Haha its been so long since Ive even looked at an older compressor. I thought there was another switch in the high pressure side line.
Looks liek there was a switch installed in the rear head of the compressor.
Ok...Im out then haha. Someone on this board used the LS1 compressor with the thirdgen stuff...has to be some info around. Ill just keep feeding bad info.
You will get other answers but it can be done very simple if you want. The LS PCM really only needs 1 thing (this is where most will disagree), it needs to know when the compressor is on. Though the PCM can manager the compressor for you the 3rd gen AC is self contained and if you connect the power from the compressor to the PCM (I'll have to look up the pin) it will handle turning on the fan and adjusting the idle. Yes, one wire.
SO my route is to hook up the a/c just like factory and run the power from the compressor to the PCM. Its the pin that tells the PCM when the compressor is on. Even if you wire it up with all the sensors and stuff the PCM still needs that final thing...to know that even if it thinks the compressor can turn on it has to know when the compressor is actually on and therefore can(and does) ignore everything else.
I'm using all third gen AC components, but want my fans controled by the LS1 PCM. Would I connect the power wire from the compressor to pin #17 on the red connector to do this. Thanks in advance, Dean
