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Old 02-10-2011, 11:17 PM
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Air Cond. and Idle Speed

In the future I plan on yanking the 4.3 out of my `92 chevy truck and dropping in a 350 small block. Since it has TBI I plan to bypass that as well and go with a Quadrajet. I want to keep the A/C as it gets rather hot down here in the summer. I`ll be using a comp hydraulic roller cam with .218 duration @.050 and .500 lift. It has a slight lopey idle.
I know GM used to use solenoids on cars that had A/C to raise the idle speed when the air cond was turned on. What I`d like to know is to what wires do I connect it to and do I need to add a relay to it? Any help on this is greatly appreciated.

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Old 02-11-2011, 04:35 AM
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Edelbrock sells an idle speed compensator that may work with a Quadrajet. It mounts under one of the bolts for the carburetor and is adjustable (screws in and out) for how much compensation you need. It does not have enough power to push the linkage and raise the rpm from idle, but if its on when you let off the throttle it will keep the idle higher.

I just wired it in to the same wire as the one running to the compressor, without using a relay. It does not draw much current, and has not been a problem wired this way. When the compressor cycles on, the idle compensator kicks in also.

Bruce
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Old 02-11-2011, 07:06 AM
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Quote:
Originally Posted by 75gmck25
I just wired it in to the same wire as the one running to the compressor, without using a relay. It does not draw much current, and has not been a problem wired this way. When the compressor cycles on, the idle compensator kicks in also.

Bruce
This is exactly what the factory did. No need to buy an aftermarket kit.
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Old 02-11-2011, 07:57 PM
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Thanks for the info guys on where to connect the wiring to. Now I should be able to pull this off without much hassle. Thanks again.
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