A/C Question for LSX Swap
#1
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A/C Question for LSX Swap
Hi,
Me again. I have another question for experienced people who do allot of LSX Swap.
I buy a kind of standalone AC controller from vintage air in my 74 nova. On the front, I put a R4 AC compressor with LS bracket stuff.
My AC is a 2 wire. For what I know, when the AC is on..the RPM Drop little bit.....and probably run too slow if the ECU doesn't recognize if the AC is on...to make the engine to run little bit higher to compensate the AC running ECU need to know that this one running.
My AC is a kind of standalone stuff....How Am I able to give to ECU a signal that telling him the AC running and climb up little bit the RPM ?
Thanks for your input.
2008 5.3 Liter E38 ECU.
Stephane
PS (Sorry for my English, I'm French Canadian and do my best to speak in English)
Me again. I have another question for experienced people who do allot of LSX Swap.
I buy a kind of standalone AC controller from vintage air in my 74 nova. On the front, I put a R4 AC compressor with LS bracket stuff.
My AC is a 2 wire. For what I know, when the AC is on..the RPM Drop little bit.....and probably run too slow if the ECU doesn't recognize if the AC is on...to make the engine to run little bit higher to compensate the AC running ECU need to know that this one running.
My AC is a kind of standalone stuff....How Am I able to give to ECU a signal that telling him the AC running and climb up little bit the RPM ?
Thanks for your input.
2008 5.3 Liter E38 ECU.
Stephane
PS (Sorry for my English, I'm French Canadian and do my best to speak in English)
#3
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Here's the E38 PCM pin diagram.
http://lt1swap.com/E38%20ECM%20Connector%20Pinouts.htm
Pay attention to pins 12, 13, and 63
http://lt1swap.com/E38%20ECM%20Connector%20Pinouts.htm
Pay attention to pins 12, 13, and 63
engaged !!!!
#4
On The Tree
From what I've read about E38's is that you can only tell it the AC is on over CAN. There is no AC request signal that's 12v like in the older ecm's. The pins mentioned in the above link are pressure sensors and the relay control.
I'm surprised to hear your rpm's drop, from what I read, most people say the drive by wire throttle will compensate for the AC load, to try to keep idle the same. I'm just finishing up wiring my E38 L76 engine and stand alone AC system, so I'll find out shortly.
I'm surprised to hear your rpm's drop, from what I read, most people say the drive by wire throttle will compensate for the AC load, to try to keep idle the same. I'm just finishing up wiring my E38 L76 engine and stand alone AC system, so I'll find out shortly.
#7
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Gary,
What do you mean by Trinary switch for fan control ?
I have a Classic Auto Air setup with the R4 compressor !
Stephane
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#8
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The trinary switch threads into the receiver/dryer, and turns on the electric fan with the AC via a ground signal to the fan relay. You likely received at least a binary switch with your kit - it's easy to tell which, as a binary has 2 wires and a trinary has 4.
Switch threaded into the top of the receiver/dryer
Trinary switch wiring
Switch threaded into the top of the receiver/dryer
Trinary switch wiring