krwyellowZ28

iTrader: (10)

I'm swapping a 1999 LS1/4L60e into a 1970 GTO that did not have AC from the factory. I plan to use the Vintage Air Gen IV Chevelle kit, but I'm not sure what I should/can do with the stock LS1 wiring harness, or how to tie it into the the VA system. I would like to keep the AC related features in the stock ECM (raise the idle when AC is on, turn on the 2nd e-fan, turn the AC off under WOT, etc)... is this possible? Or does everyone wire the engine as if it didn't have AC, and then the AC is a self-contained system? I have emailed the VA tech dept a couple times and they basically say they don't tie into anything ECM related.

Thanks in advance for any help.

krwyellowZ28

iTrader: (10)

I might have answered my own question... a Google search came up with better results than the forum search tool.

https://ls1tech.com/forums/conversio...m-drawing.html

Rocketrod

iTrader: (2)

I am sure others will chime in, but from what I have read when using Vintage Air it is not tied into your ECM. It is stand alone and you can get a WOT switch to shut it off during those conditions. I will be running mine stand alone w/o the WOT switch as I just don't see it as being needed based on how I plan on driving the car with the A/C on.

1989GTA

Hmmmm, I did not think about the wide open throttle switch in case I had the A/C on. I will have to look into that.

garys 68

iTrader: (1)

Dont worry about connecting to the ecu or even the WOT switch. I've got a VA and Classic Auto Air on LS swaps. No issues after years of running.

Tony C.

I've done about 5 of these and you can easily install the two. Just hook the va compressor wire to the a/c request wire of the ecm. The wot ive never used and the fans are control by the ecm.

the450r

iTrader: (1)

So I've read several threads on this topic and still not sure what method to use. I have a 68 GTO with a 68 Chevelle VA gen IV kit. 01 Camaro pcm, sd7 compressor and a binary switch. My cam has a pretty aggressive idle. My original plan was to use the ac request wire to turn on the fans and bump the idle. Possibly to turn Off the compressor at wot. But some say it's not needed.

garys 68

iTrader: (1)

Trucks use a fixed compressor and binary switch off/on.
01 Camaro uses variable compressor and a variable pressure switch. Not sure the Camaro pcm will understand an on/off binary switch. Others have grafted in the Camaro variable pressure resistor.

gofastwclass

iTrader: (2)

Thread from 2012? The rumor is true, the search feature works!

Gen III truck and Camaro PCM's are the same with different software settings to match the hardware. There are switches available within HP Tuners to adjust this according to your hardware. I personally can't tell you what they all mean, but I can tell you what HP Tuners has listed. The options are: Serial, Serial Cycling, Analog, Analog Cycling, Passive and Not Fitted.

Serial and Serial Cycling - I don't know, I've never used them
Analog - Stock 2002 F-Body (Camaro / Firebird / TA) stock 2002 Y-Body (Corvette)
Analog Cycling - (stock 2002 truck) I'm using this on my Thunderbird with the f-bomb compressor and hardware controlled by the GM PCM.
Passive - I would ASSUME this means AC is fitted, but the PCM doesn't control it
Not Fitted - self explanatory.

garys 68

iTrader: (1)

Yep, very true, I'm pretty sure the 411 ecu can do fixed vs variable compressor/pressure sensor, manual vs auto trans, DBW vs cable, etc. He would have be sure the pinouts and wiring are correct for the application. Not sure about incompatibility issues though.

the450r

iTrader: (1)

Binary switch is what VA came with. Sd7 is a fixed compressor. From what I've read I need a second relay to trigger the compressor request to the pcm and if I want a wot switch to use a Camaro Tri switch. But some say you don't need it.