A/C & WOT
#1
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So it seems that Porsche engineers are fans of Star Trek...
Captain Kirk (me) says "I'm coming out of the apex, I need more power, take me to full warp" and Scotty (the computer that manages the car's systems) say's "but captain, I'm give'n it all she's got, the only way I can git chew more power it to start shutt'n down the climate control, and if I do that, it's gonna get hot in here (sounds better if you can read with a Scottish accent.) Captain Kirk says, "Scotty, I've got to have more power" as the Captain keeps his foot planted, and the warp drive begins to howl as it spins up toward 6,000 RPM. Scotty, eager to please the Captain, shuts down the A/C compressor so that max power is available. The Captain, seeing the next curve ahead, gives the command to "take us out of warp" and Scotty, reengages the A/C compressor...
Thinking this was some kind of malfunction, I took the car in to the dealer to be checked. Apparently, our cars were designed so that when max power is called upon (sustained WOT), the A/C compressor is temporarily shut down.
This may be common knowledge, but I had never seen it discussed here, so I figured I'd post. Now I'm just waiting for one of you to tell me that the service manager and the tech who read me the description from some Porsche manual are FOS.
Captain Kirk (me) says "I'm coming out of the apex, I need more power, take me to full warp" and Scotty (the computer that manages the car's systems) say's "but captain, I'm give'n it all she's got, the only way I can git chew more power it to start shutt'n down the climate control, and if I do that, it's gonna get hot in here (sounds better if you can read with a Scottish accent.) Captain Kirk says, "Scotty, I've got to have more power" as the Captain keeps his foot planted, and the warp drive begins to howl as it spins up toward 6,000 RPM. Scotty, eager to please the Captain, shuts down the A/C compressor so that max power is available. The Captain, seeing the next curve ahead, gives the command to "take us out of warp" and Scotty, reengages the A/C compressor...
Thinking this was some kind of malfunction, I took the car in to the dealer to be checked. Apparently, our cars were designed so that when max power is called upon (sustained WOT), the A/C compressor is temporarily shut down.
This may be common knowledge, but I had never seen it discussed here, so I figured I'd post. Now I'm just waiting for one of you to tell me that the service manager and the tech who read me the description from some Porsche manual are FOS.
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#5
Burning Brakes
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Anybody know if it's designed this way just in order to provide more power upon request, or is this somehow to minimize stress on the A/C system's parts? Is it tied to the throttle, or is it tied to the RPM?
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#8
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Curious to try this...
#9
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Been around for many 15-20 years, or maybe even more. In the older cars it was tripped by engine vacuum (directly related to throttle position) but I have to believe it is all electronics today. I seem to recall it was implemented sometime after emissions controls zapped all the horsepower years ago, and car manufacturers were trying to compensate under full throttle condition.
#10
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Why Porsche did this on a 408 horsepower car is baffling to me.
Michael
#12
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I doubt the compressor is designed for much use in the 6000 rpm range.
#13
Drifting
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I had to do this manually on my woefully underpowered 3.4L V6 Camaro. It was very noticeable difference, and was NOT automatic. If I had a passenger, I'd cry out "Engaging super turbo boost!" and reach up and turn off the AC before merging onto the highway and such.
#14
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