Re: [DML] RPM Drop When turning on AC

["Tom Niemczewski" <dmctom@xxxxxxxxx>]

On the properly working K-Jet it should not drop at all. The idle control 
module should keep the RPM constant regardless of load (to a certain point).
On Megasquirt you should have the A/C compressor connected to the ECU and it 
should bump the RPM up by about 200 rpm with the compressor running.

Are you sure the rpm are dropping? It might be just the tach gauge. When the 
A/C is running, both cooling fans are running with it. That causes a voltage 
drop and when the connections are not clean and perfect will cause a 
significant drop in the instrument cluster. With lower voltage the gauge 
might show strange things.... lower, higher, jumping around. So, make sure 
the rpm are really dropping before you start tearing things apart.

Greetings from Poland!
Tom Niemczewski
Vin 6149 plus 2418, 3633, 5030, 16473, 17086
Google earth: 52°25'17.66"N, 21° 1'58.40"E

--------------------------------------------------
From: "birdwell77095" <birdwells@xxxxxxx>
Sent: Friday, July 13, 2012 1:20 PM
To: <dmcnews@xxxxxxxxxxxxxxx>
Subject: [DML] RPM Drop When turning on AC

> How much should the RPMs drop when turning on my AC? A friend's car only 
> has a minimal drop, maybe 50 RPMs. My car seems to drop 200-300 RPMs as if 
> there is a large load on the engine. Bad electrical contacts? Not fully 
> charged? It blows cold so it seems to be fully charged.
>
> Shannon
> VIN 16113
>
>
>
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