Z 2 8

I was just curious how much slower an LT1 is with the AC on. I personally can feel a difference. I was curious if anyone knew exactly how much of a change it actually is.

For instance, if I ran in the quarter with it on and then with it off. Would I see a different time?

Thanks for the help.

mike1500

iTrader: (3)

Of course you would! Its like adding a whole new accessory when your A/Cs clutch kicks in puts alot more resistance on the belt.

blind527

iTrader: (8)

I hear you won't feel much of a difference. I guess the A/C shuts off at WOT so you won't be losing any horsepower.

Z 2 8

I can definitly feel a difference at WOT. I just wanted to know if this was actually proven.

I personally believe the car is slower, but I would rather know that just guess...

Because if it didn't make a difference, I mine as well just keep the AC on at all times. (Even if I'm racing)

BlackBirdWs6Zzz

iTrader: (6)

My ac doesn't work anyways so I think i'm going to delete that and EGR and AIR

1SlowFormula

The AC turns off at WOT the difference you are probably feeling is the warmer temp in the cooling system after driving with the AC on, plus the drag change from part throttle to WOT before the clutch fully disengages. If you go to the track and cool down between runs there should be no difference with a run of the AC on vs off...

ec_nova

iTrader: (5)

the ac doesn't turn off during WOT. They started this i believe in 99 or 2000 on the fbody.

95_formula

With the ac on in my 95 I traped 3 0r 4 mph slower each time and I got the time slip to prove it.

blkchevyz

dont run the a/c at the track... the condisation will leak on the track and make it trouble for the rest of us.

on the street... it only take a second to turn the *** off.

buffman

iTrader: (9)

Wrong.... AC clutch disable happens at WOT, and if you have a tuner whatever TPS you feel like setting it to..

NHRAMAN

iTrader: (1)

You are right....They started this in the 99 LS1 F-body.

NHRAMAN

iTrader: (1)

I read it was started in 99...whatever..turn the damn thing off anyway..who cares..

1SlowFormula

Mine does it and looking into the tuning software I have (tunercat) you can change it too if you want...

Nevermind I just noticed somone else mention it...

urbanhunter44

iTrader: (1)

mine turns off at WOT in my '97. With it on I can definetly feel a difference at part throttle.. largely in my gas guage moving much quicker than it should But DAMN it blows cold

transam5.7lt1

iTrader: (18)

I did test mine on the 1/4 mile about a year ago, there was a difference of .35 more on the run.

ec_nova

iTrader: (5)

mine doesnt turn off but hey... got it tuned by pcmforless and the tune is complete **** so go figure haha

Sgt. Spuds

iTrader: (1)

Mine turns off with stock tune, as did our brand new 1993 camaro.

Captainofiron

iTrader: (1)

the A/C clutch kicks out when there is a major load on the engine so you wouldnt see a difference, now when the a/c is on the compressor usually uses any where from 20 to 40 horses depending on the compressor

jessmansweet

the WOT a/c cutout has been around since....well since they started computerizing! It certainly didnt start in the f-body in 99. As said before the differences in the Quarter times are from extra heat from the a/c and making the engine work harder to turn the a/c creating heat soak of the intake before it turns off. Not to mention the much higher underhood temps and running cooling fans. Next time you guys try the a/c quarter thing dont use the a/c until 1 or 2 seconds before the launch. this will keep the heat from building up before the run and give closer results.You may still see a small difference from the a/c being on right before WOT. I suppose if you were curious enough you could wire a temporary light to the a/c compressor to prove it. From looking at various year lt1 files all the LT1's were cutoff at 99.6% and the L99's were 92.2%. I checked both b and f body files. Dont know on the LSx. I also suppose that those of you that dont actually get the cutoff may not be getting 100% on the TPS. Might want to check that!

Shackleford

iTrader: (12)

20-40 horses? Wow.