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Thread: RPM drops when turning A/C on
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07-08-2007 #1
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- Join Date
- Sep 2004
- Location
- Fresno, Ca
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- 379
It's wired up so that when the A/C clutch is engaged, the positive feed also engages the solenoid. It seems like GM used a diode across the clutch to control feedback/spikes, but you can experiment. Look at a 70's/80's carbed GM for inspiration.
BTW- the solenoid grounds through the body, so it only needs a positive feed.
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07-08-2007 #2
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- Dec 2005
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- 60
The A/C dragging the idle down is normal and is especially noticeable with a big cam.
I ran a setup exactly as PonchoJohn describes and it works like a charm. The solenoid is adjustable so you can set the idle to suit you best with the A/C on and use your regular carb settings with it off.
Since my LT1 swap, I haven't got the A/C plumbed in yet but I see a table in my tuning program that compensates idle speed as a function of A/C high side pressure. Should work even better.
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