ac idle up switch

[thesprocks]

Hi Gang,
I have a 1976 Porsche 912E that I have installed an air conditioner on. It works fine except for one thing.......everytime the compressor kicks on, the engine rpms drop by about 200 or 300 rpm's.
I am seeking a vacuum swithc that I can wire into the compressor so that every time the compressor gets a signal to turn on, it will create a vacuum leak, therefor causing my idle speed it increase.
Does any body have any ideas on this?
Please respond to jeffgill1120@gmail.com

[Discseven]

Sprocks... it's normal for rpm to drop when compressor kicks in. Any specific reason you don't want to let it be?

[dos531]

You could put a solenoid on a vacuum line that runs from before the tb to after the tb. It would be like a mini AAR. Kind of seems like more trouble than its worth though.

[wwest]

When you remove the oil filler cap the RPM drops....

You need to move the throttle plate in order to raise the engine RPM

[kuehl]

There are a few ways to raise the idle RPM's when the compressor clutch engages.
It can be an annoyance at idle, however I had a 73T 911 with carbs and it idled just fine at 550 rpms with the compressor clutch engaged (can't say it was a rocket pulling onto a highway though, lol).

What are you using for engine fuel/ignition management, Bosch L-Jetronic?

[ganun]

+1 on dos531 solution, that was the std way to bump the idle, it's simple if you already have ports before and after the butterfly. an idea is to use a fuel cut off solenoid from a carburetor,
but still need a needle valve to adjust the amount of air and set the idle speed. Now if you had a 3d printer you could make a custom valve holder with said provision.......
...the smaller the engine the more you need idle bump, how do I know? I put a decent a/c into my Fiat 128 wagon decades ago (with the BIG 1300, not the 1100 engine). hehe