A/C is killing my engine power

[pepsihatman]

Just wanted to ask:

When the air conditioning is on in your tegs (specifically GSR's) do you really feel a huge power loss? I am talking one that almost doesn't allow you to accelerate before 2,700 or so. It seems to bog the engine down so much when I use the a/c. It really doesn't pick up til 3k.. and I hate reving to that during daily driving. Normally (no a/c) I rev to 2,700 or so and shift. Can't do this with the a/c on. It's getting really annoying, so I was wondering if it was normal. Thanks.

[boosted k20]

i had that problem when i tuned my car for nitrous with the timing retarded and had the AC on. car felt like it had no power at all. check ur timing. advance it a bit on the dizzy if u cant do it from the ecu. set it to like 18 degrees

[pepsihatman]

What do you mean advance it on the ECU? I have a stock ECU only intake and header mods. I'll check the timing sometime tomorrow probably, have to borrow my friend's timing light.

[boosted k20]

if u had a chipped ecu u could advacne the timing with a program like uberdata, but since ur run n stock, just advance the dizzy

[pepsihatman]

What's the normal timing supposed to be... 16, 15, 12 degrees?

[boosted k20]

16*, timing should be at the red mark on the crank pulley btw the two white lines. u want to set it on the white line closest to the front of the car when u turn the dizzy to set it at 18*

[Ace$nyper]

Not that much in my car but I feel a tiny bit i'm also moving about 800 lbs less, and have little more work.

[pepsihatman]

Originally Posted by boosted k20

16*, timing should be at the red mark on the crank pulley btw the two white lines. u want to set it on the white line closest to the front of the car when u turn the dizzy to set it at 18*

Roger. Thanks.

[CRXGRETH]

its normal for it to feel like it is lagging power due to the fact that wit the ac on it is now spinning the clutch inside the ac and when it is off it is not spinning the clutch but when u hit 2700 the computer turn that clutch off so u have the power. have u ever felt the ac get a lil warm when u jump on it that is because it turn that clutch off so u have power.

[xblastxb16]

if your engine bogs down its most likely not your ac if it only happens when you at a certain rpm it might be bad sparks or plugs, fuel filter, IAC valve or one of your cylinders isn't hitting check for wierd exhaust sounds hope i helped

[pepsihatman]

The sound coming from the engine is like me pushing the gas hard, but it's not moving the revs. Kinda gets a low groaning tone, and pushing the gas farther slows it down more, but letting off makes it better.... it's really weird. It sometimes happens when I'm cruising at 40 mph with a/c on, I push the gas, and at a certain point it starts to slow down, and I let off and it gets a little more powerful.... any idea what that is?

[xblastxb16]

i've heard a few times it may have something to do with the computer but start small an inexspensive an work your way up so you dont replace stuff that doesn't need to be replaced but i myself, would disconnect the ac an see if the problem is still there. it would suck but at least you'll know for sure. GOOD LUCK THOUGH !!!

[AngelsHolocaust]

yeah i just dont use the a/c because it just robs me of power so much

[pepsihatman]

Originally Posted by AngelsHolocaust

yeah i just dont use the a/c because it just robs me of power so much

I live in NC, and the temperature for the past few days has been 90+... can't go without it.

[AngelsHolocaust]

yeah its been like that too for the past month here in chicago..and im telling you that black leather is NOT forgiving