Boost Reduction with AC on? Options

[Geddes]

It was a fairly hot day today (over 30 degrees celcius) and I was cruising down the highway with the ac on which I don't normally have on.. and noticed that the car was not boosting as per normal..

I know the TSVS setup will reduce boost levels if it thinks its seeing knock, so with the very hot air im assuming it was pulling a bit of boost for that reason, but having the ac system turned on drops the boost even more (I have no actual numbers to give you as I dont have my boost guage hooked up yet), but for comparison, the car with the ac off will peg the boost needle near the top (on a colder day it will hit the plus sign above the top of the guage) but when i turn the ac on, it only makes it to about bar 4 of 6 on the guage..

TLDR version: any one else with a GT-4 with no boost controller installed notice a reduction in boost with the ac on? or is mine just doing something odd..?

for reference, I checked between ac on and off in 3rd gear every time.

[stephen_lee]

from BGB:

"WHEN THE VEHICLE SUDDENLY ACCELERATES FROM LOW ENGINE SPEED, THIS SYSTEM CUTS OFF AIR CONDITIONING (AIR
CONDITIONER) OPERATION FOR A FIXED PERIOD OF TIME IN RESPONSE TO THE VEHICLE SPEED, THROTTLE VALVE OPENING
ANGLE AND INTAKE MANIFOLD PRESSURE IN ORDER TO MAINTAIN ACCELERATION PERFORMANC"

[Geddes]

from BGB:

"WHEN THE VEHICLE SUDDENLY ACCELERATES FROM LOW ENGINE SPEED, THIS SYSTEM CUTS OFF AIR CONDITIONING (AIR
CONDITIONER) OPERATION FOR A FIXED PERIOD OF TIME IN RESPONSE TO THE VEHICLE SPEED, THROTTLE VALVE OPENING
ANGLE AND INTAKE MANIFOLD PRESSURE IN ORDER TO MAINTAIN ACCELERATION PERFORMANC"

hmm.. pretty similar to most cars really.. a lot of manufacturers will turn the comperessor off if the car is at WOT.... mine is not doing this.. which doesnt matter really.. I had just never seen a turbocharged car actually physically lose boost pressure due to the ac being on (after talking to a fellow gt-4 owner in my city, his acts the exact same way as mine).. my car only builds about half its normal boost pressure when the compressor is running.. as does his.. kind of weird but apparently its normal for them..

but hey, when its above 40 degrees celcius, I'd rather have the ac than the horsepower