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JimD · 07-20-2012, 10:02 AM

Instead of cycling the AC compressor on and off BMW apparently changes the volume of what the AC compressor is compressing. That has the same effect of only giving you as much cooling as you need. So if your AC is just switched on but the car doesn't really need to be cooled, you will be losing very little hp. On a really hot day, the compressor will be going flat out and the car may also need to back off on ignition timing to avoid detonation.

Jim

07-20-2012, 10:02 AM	#61
JimD Brigadier General 368 Rep 3,547 Posts Drives: 128i convertible Join Date: Apr 2009 Location: Lexington, SC iTrader: (0)	Instead of cycling the AC compressor on and off BMW apparently changes the volume of what the AC compressor is compressing. That has the same effect of only giving you as much cooling as you need. So if your AC is just switched on but the car doesn't really need to be cooled, you will be losing very little hp. On a really hot day, the compressor will be going flat out and the car may also need to back off on ignition timing to avoid detonation. Jim __________________ 128i Convertible, MT, Alpine White, Black Top, Taupe Leatherette, Walnut, Sport Ordered 5/22/09, Completed 6/4/09, At Port 6/9/09, On the Georgia Highway 6/13/09, Ship Arrived Charleston 6/24/09 at 10pm, PCD 7/21/09
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