LQ4/T56 into my 69 Camaro
07-06-2011, 09:19 AM
#802
The Vintage Air setup operates as a stand alone unit, but the poster above (SS69LS1) said he connected it to his ECM somehow so it could adjust the idle and turn on the fans whenever the AC is running. I think that's a great idea and I'd like to know how to do it.
07-06-2011, 11:31 AM
#803
According to Sam Mcllough that wired the harness, the PCM will cut the fans on according to the temprature of the engine regardless of whether the A/C is on or off. The A/C will only be used when its hot outside so getting the engine to temp shouldnt be a problem. The PCM will also adjust idle when its under a load whether it be A/C or whatever. Yeah it would be cool to replicate the factory setup but its really not neccesary. You could actuate a fan from the Vintage Air setup and use one for the PCM or add a fan to the front of the condensor and push air only when the A/C is on. Several different methods its just what works for you.
07-06-2011, 11:57 AM
#804
What is the pin designation for the signal to the ECM? On my LY6 E38 ECM, I have a few pins related to AC and I don't know how they function:
12 - A/C Refrigerant Pressure Sensor Signal (CJ2/C67
13 -Low Reference (4.8L/5.3L6.0L/6.2L with CJ2/C67) - A/C Refrigerant Pressure Sensor Pin 1
34 - 5-Volt Reference 1 - A/C Refrigerant Pressure Sensor Pin 2
63 -A/C Compressor Clutch Relay Control (CJ2/C67)
12 - A/C Refrigerant Pressure Sensor Signal (CJ2/C67
13 -Low Reference (4.8L/5.3L6.0L/6.2L with CJ2/C67) - A/C Refrigerant Pressure Sensor Pin 1
34 - 5-Volt Reference 1 - A/C Refrigerant Pressure Sensor Pin 2
63 -A/C Compressor Clutch Relay Control (CJ2/C67)
07-06-2011, 02:18 PM
#805
You need to be careful here. What Snow is doing for dual fans is totally different than what the factory is doing with their dual fans. His fans will be controlled separately outside the PCM. What the factory does is use 3 relays to control the fans. They energize one relay that puts the fans in SERIES. That cuts the voltage in half and both fans run at half speed. The PCM energizes the other two relays for high speed. This puts the fans in PARALLEL...which gives each fan 12V and they both run at high speed. The logic the factory uses to control the fan speeds leaves a lot to be desired in my opinion. I want both fans on high whenever the a/c is on. I wired up a manual switch for that purpose. I also want them to come on sooner anyway...that's what PCM programming is for. I hope this gives you an idea of what you have.
07-06-2011, 02:39 PM
#809
Thats always an option too! I may end up just putting a stand alone fan for the A/C and leave the engine fans alone. This will all depend on how well the cool. Their Spal fans but sort of small. I like BMF's radiator and after all the trouble I had mounting my setup I wish I had just bought the direct bolt in unit. Are your fans keeping the car cool? What temp does it stay around while running down the road? at stop lights?
07-06-2011, 02:51 PM
#810
Thats always an option too! I may end up just putting a stand alone fan for the A/C and leave the engine fans alone. This will all depend on how well the cool. Their Spal fans but sort of small. I like BMF's radiator and after all the trouble I had mounting my setup I wish I had just bought the direct bolt in unit. Are your fans keeping the car cool? What temp does it stay around while running down the road? at stop lights?
07-06-2011, 04:34 PM
#813
thanks,
Jim
07-06-2011, 07:53 PM
#816
I have finally wired in the OBD2 connector and have all sorts of codes popping up. My idle keeps climbing as it gets warm, headers are glowing red, and the temps between headers are erratic between cylinders. I have a MAF code p0101 and a p0651 which is a voltage B circuit open. What the hell is a a voltage B circuit open??? Anyone care to help?
07-06-2011, 08:17 PM
#820
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