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Message: <blockquote data-quote="rollakid" data-source="post: 1788041" data-attributes="member: 6588">agreed. engine 100hp will always be 100hp. the difference with aircond on and off is just that, with aircond on, maybe 5hp is eaten by the compresor to spin it, and you get 95hp left to run your car. but with aircond off, you get all the power to drive your car (ofcourse there's the drive train lose lar).this is true because long time ago toyota did "downgrade" the compresor cuz the customer is complaining that it is robbing too much power.there is theorically posible way to get cold air without using a compresor. That is to use your current blower and cooling coil, but instead of using aircond gas pump in by the compresor, use a tank of nitrogen or liquid nitrogen instead. just pump some into the cooling coil (assume it won't freeze too much and crack instead) and you'll get freezing cold aircond, and let the extra gas release to the atmostphere from teh engine bay like a normal aircond systemcatch is that you'll need an N2 or LN2 generator, and the extra weight carried in the car for the tank, all gonna cost you a fortune. i'd rather turbo or supercharged my car and pay for the extra petrol bill instead of using those methods.oh.. just for the record, i do have my aircond off 70% of the time because of my driving condition. all my trip is short and i usually try to get to the destination before the car cabin get too hot.it did saves me 10-15% in fuel consumption, but that is because my engine is not stock, and all the pulley is from a different car so it pulls much harder at low rev and rob alot more power. engine will die easily cuz the low end of my engine got no torque. so i adjust to idle valve for aircond on to crank the engine up 200-600rpm (engine will idle at 1400-1700rpm when still cold and aircond on, 1000rpm when hot, 900rpm when no aircond, anything below 800rpm engine jerk and die) to prevent engine dying. thats why i can get 15% petrol saving, and my car got no aerodynamic anyway so going fast with window down doesn't make anything noticable.</blockquote>

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