545i idle quality comparision with A/C ON and OFF
10-21-2006, 09:24 AM
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My Ride: 2004 545iA - Built date 09/03, Sport Package, Alpine White III, Grey Interior, Cold Weather Package, PDC, Rear Electric Sunshades, Comfort Seats, Logic 7, Chromed BMW Style 124 18x8, 18x9 Wheels, M-Tech Aero Kit, Rear Trunk Decklid Spoiler, Tinted Windows, Valentine One
Modifications: RDSport Quad Exhaust, 20x8.5 and 20x11 HRE 943R, Vorsteiner CF Decklid, Dinan CAI
How many 545i drivers always drive with their air condition ON? If so, do you notice a significant difference in the idle quality when the car is idling in Park and Drive with the air condition ON and OFF?
I notice my car's idle quality is much better with the air condition ON when it is idling in Park and Drive as opposed to when the air condition is OFF.
Thanks in advance for your feedback!
I notice my car's idle quality is much better with the air condition ON when it is idling in Park and Drive as opposed to when the air condition is OFF.
Thanks in advance for your feedback!
10-21-2006, 09:59 AM
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My Ride: 2008 - M5 - Alpine White - Portland Brown Full Merino - Madeira Walnut - Manual Trans - Enhanced Premium Sound - HD Radio - Sirius- iPod - Sun Shades - Soft Close Doors - Comfort Access
My idle speed jumps almost 100 rpm when A/C is on.
BENIFITS: Idle seems smoother.
BENIFITS: Car can make smoother (less jerk) full stops.
DOWNSIDE: Car wants to idle away from stop with no accelerator pedal to 5MPH on it's own.
BENIFITS: Idle seems smoother.
BENIFITS: Car can make smoother (less jerk) full stops.
DOWNSIDE: Car wants to idle away from stop with no accelerator pedal to 5MPH on it's own.
10-21-2006, 10:15 AM
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My Ride: E61 535d Apr 05. UK spec + Media Pack, Luxury Pack & Visibility Pack
Not a 545i, but...
On my E39 535i (smaller V8; never made it to the US), putting a/c on meant idle went from ~470 rpm to ~600 rpm. I did not like it, as the engine was noticeably "running", whereas it was very smooth and unnoticeable without. "Creep" was also much stronger, so heavy foot on brake or engaging neutral at lights were absolutely compulsory (useless parking brake on E39). This seems very consistent with wmhandy's observations.
On E61 535d, idle speed or smoothness (
) does not change, but then again it's a diesel, so torque at low rpm is very very high.
On my E39 535i (smaller V8; never made it to the US), putting a/c on meant idle went from ~470 rpm to ~600 rpm. I did not like it, as the engine was noticeably "running", whereas it was very smooth and unnoticeable without. "Creep" was also much stronger, so heavy foot on brake or engaging neutral at lights were absolutely compulsory (useless parking brake on E39). This seems very consistent with wmhandy's observations.
On E61 535d, idle speed or smoothness (
) does not change, but then again it's a diesel, so torque at low rpm is very very high.
10-22-2006, 03:08 AM
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My Ride: 2004 530i 6-speed Titanium Silver/Black Interior
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Not related to your original question (as I have a 530i and 6MT) but I have noticed that with the A/C ON, my car loses RPMs much faster making it harder to shift smoothly (and it does idle a little bit higher)
10-22-2006, 08:12 AM
#5
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Iceman has his A/C on all the time. He can walk in the winter park with only T-shirt on. That's why he and his friend calls him the "ice man" 
I don't like to have A/C on because the fan noise is excessive sometime.
I don't like to have A/C on because the fan noise is excessive sometime.
10-23-2006, 08:03 AM
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My Ride: BMW 545iA Black Sapphire
Model Year: 2005
Engine: 545i
a/c not always on. Idle quality same for both...smooth.
rpm @ 800 during a/c operation - but not always, goes back to 500rpm when cabin has reached desired climate conditions...
agree with some, creeping power is obviously higher when working @800rpm which makes for a heavier braking foot when idle - don't really like that.
rpm @ 800 during a/c operation - but not always, goes back to 500rpm when cabin has reached desired climate conditions...
agree with some, creeping power is obviously higher when working @800rpm which makes for a heavier braking foot when idle - don't really like that.
10-23-2006, 11:34 AM
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My Ride: 2015 535D M Sport
Originally Posted by andy545' post='347936' date='Oct 23 2006, 11:03 AM
a/c not always on. Idle quality same for both...smooth.
rpm @ 800 during a/c operation - but not always, goes back to 500rpm when cabin has reached desired climate conditions...
agree with some, creeping power is obviously higher when working @800rpm which makes for a heavier braking foot when idle - don't really like that.
rpm @ 800 during a/c operation - but not always, goes back to 500rpm when cabin has reached desired climate conditions...
agree with some, creeping power is obviously higher when working @800rpm which makes for a heavier braking foot when idle - don't really like that.
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