Recent Topics
FJC Foaming Evaporator Cleaner Review
by Reddy45 - 07/04/20 12:10 AM
Ford 351W oil filter best value
by alex16 - 07/03/20 11:12 PM
Super tech euro 5w40 - Canada
by Johan1 - 07/03/20 10:19 PM
Strangers show up for vet's funeral.
by simple_gifts - 07/03/20 09:44 PM
Troybilt tb22ec refuses to run correctly
by Dogred08 - 07/03/20 09:43 PM
Harbor Freight Nitrile gloves
by 1978elcamino - 07/03/20 09:04 PM
Did anyone get a 25% coupon for July 4th?
by 1978elcamino - 07/03/20 08:58 PM
05 4.6 Northstar crank sensor re learn?
by cknight49090 - 07/03/20 08:40 PM
In the year 2049...
by eljefino - 07/03/20 08:05 PM
2-year old oil 124 Spider
by DAC17 - 07/03/20 07:57 PM
New to us van
by ram_man - 07/03/20 07:22 PM
original '05 Chrysler trans pan gasket material ?
by visitor - 07/03/20 06:16 PM
rock auto can't ship to Calif????
by 928 - 07/03/20 06:04 PM
2001 Silverado 1500 T-Case Fluid
by Blang - 07/03/20 05:53 PM
Nasty Car wreck
by ford46guy - 07/03/20 05:53 PM
Best style of condenser?
by ddeflyer - 07/03/20 05:17 PM
Advance Auto now selling Die Hard Batteries
by Kira - 07/03/20 05:01 PM
Ontario Nuclear update - Part 2
by OVERKILL - 07/03/20 04:36 PM
Is this totaled?
by NoNameJoe - 07/03/20 04:23 PM
Newest Members
Johan1, MrMoneyMcLube, JeffAR, ThaKid22, Speedeuphoria
71843 Registered Users
Who's Online Now
41 registered members (alphadog, BigGeo, BLND1, agpatel, 4 invisible), 1,113 guests, and 32 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics307,396
Posts5,310,310
Members71,843
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
Page 1 of 2 1 2
A/C Compressors #5459389 06/21/20 07:36 PM
Joined: Dec 2014
Posts: 660
2
2010Civic Offline OP
OP Offline
2
Joined: Dec 2014
Posts: 660
Does anyone know why in newer cars you don't feel a power loss when the a/c kicks on but older cars you do? In my 05 accord I can definitely feel a power loss but in my 08 and 10 Civic I feel nothing. Is it that newer compressors are more efficient or does the electronic throttle compensate for it?


2010 Honda Civic LX
Valvoline SynPower 5w-20 - Napa Gold oil filter
59,992 miles
Re: A/C Compressors [Re: 2010Civic] #5459393 06/21/20 07:46 PM
Joined: Mar 2013
Posts: 6,912
S
skyactiv Offline
Offline
S
Joined: Mar 2013
Posts: 6,912
Depends on the make & model, 4 cylinder Accord vs V6. Newer vehicles have more efficient AC compressors but many vehicles will turn off the AC compressor under high throttle demand like flooring it to pass a vehicle.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: A/C Compressors [Re: 2010Civic] #5459395 06/21/20 07:51 PM
Joined: Jun 2003
Posts: 21,050
C
Chris142 Offline
Offline
C
Joined: Jun 2003
Posts: 21,050
Many new cars use a variable displacement compressor. Only pumps as much as needed instead of full throttle all the time. Others are clutchless and always on so you wont feel it or hear the clutch click.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: A/C Compressors [Re: Chris142] #5459398 06/21/20 07:58 PM
Joined: Mar 2013
Posts: 6,912
S
skyactiv Offline
Offline
S
Joined: Mar 2013
Posts: 6,912
Originally Posted by Chris142
Many new cars use a variable displacement compressor. Only pumps as much as needed instead of full throttle all the time. Others are clutchless and always on so you wont feel it or hear the clutch click.


I think newer VW's are always on.


Wife: 15' Audi A4 quattro 6 speed manual
Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: A/C Compressors [Re: 2010Civic] #5459402 06/21/20 08:02 PM
Joined: Nov 2009
Posts: 6,009
M
motor_oil_madman Offline
Offline
M
Joined: Nov 2009
Posts: 6,009
You feel it in my truck, especially when the engine fan kicks on 100 percent and my truck has 350hp and 650 ft lbs of torque.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: A/C Compressors [Re: Chris142] #5459434 06/21/20 08:39 PM
Joined: Oct 2014
Posts: 1,497
K
KGMtech Offline
Offline
K
Joined: Oct 2014
Posts: 1,497
Originally Posted by Chris142
Many new cars use a variable displacement compressor. Only pumps as much as needed instead of full throttle all the time. Others are clutchless and always on so you wont feel it or hear the clutch click.


This is the best answer.


2017.5 Nissan Rogue SV FWD
2013 Nissan Maxima SV
2009 Ford Flex SEL FWD
1984 Yamaha XJ750RL
Re: A/C Compressors [Re: 2010Civic] #5459449 06/21/20 09:07 PM
Joined: Nov 2011
Posts: 4,542
E
earlyre Offline
Offline
E
Joined: Nov 2011
Posts: 4,542
the a/c in my car is electric... keeps running even when the engine shuts off at a light, etc...

but then again, so is the water pump, power steering, etc...no accessory belt drive at all.

Last edited by earlyre; 06/21/20 09:08 PM.

Mine:
13 Ford C-MAX hybrid: Bulk Maxlife Full Syn 5w20,& Valvoline Jobber Filter
( I was Lazy and had a Groupon)
Re: A/C Compressors [Re: 2010Civic] #5459487 06/21/20 10:12 PM
Joined: Apr 2013
Posts: 6,614
G
gregk24 Offline
Offline
G
Joined: Apr 2013
Posts: 6,614
I'm not sure about your Honda's since they use a traditional compressor with a clutch. The compressor in my wife's VW is variable so you never feel it kick on/off.


2012 Honda Accord EX-L K24z3
61,xxx miles
PPPP 0w20 / Fram Ultra

2014 VW Jetta SE 1.8T ea888
54,xxx miles
Castrol Edge 0w40 / OEM filter
Re: A/C Compressors [Re: motor_oil_madman] #5459502 06/21/20 10:38 PM
Joined: Jun 2003
Posts: 21,050
C
Chris142 Offline
Offline
C
Joined: Jun 2003
Posts: 21,050
Originally Posted by motor_oil_madman
You feel it in my truck, especially when the engine fan kicks on 100 percent and my truck has 350hp and 650 ft lbs of torque.

Odd. Does not effect the 158hp idi in my f250. At least I can't feel it.


02 Wrangler Napa high milage 10w40
87 F250 Valvoline 15w40
07 fjcruiser Car lube plus 10w30
Z400 castrol T 10w40
Can am Maveric edge 5w40
57 case tractor Chevron sae30
Re: A/C Compressors [Re: 2010Civic] #5459516 06/21/20 11:40 PM
Joined: Nov 2009
Posts: 6,009
M
motor_oil_madman Offline
Offline
M
Joined: Nov 2009
Posts: 6,009
No offence but if the old 7.3 IDI is already slow as a snail are you really going to notice if it's a tad bit slower?


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: A/C Compressors [Re: 2010Civic] #5459608 06/22/20 06:25 AM
Joined: Mar 2017
Posts: 13,704
PimTac Offline
Offline
Joined: Mar 2017
Posts: 13,704
People get used to it any never notice the drop these days, especially if they use auto climate control.

A lot of this come from memories of old AC systems in cars. Those compressors were huge and the power hit was noticeable. It’s a lot more efficient today.


2017 Mazda CX5
Mobil 1 Annual Protection 0w20
Roki OEM filter.
Re: A/C Compressors [Re: 2010Civic] #5459705 06/22/20 08:58 AM
Joined: Jun 2002
Posts: 13,727
K
Kestas Offline
Global Moderator
Offline
Global Moderator
K
Joined: Jun 2002
Posts: 13,727
My 1991 Mercury Marquis had the quietest compressor I've ever experienced. I couldn't tell when it came on.

Re: A/C Compressors [Re: 2010Civic] #5459739 06/22/20 09:48 AM
Joined: Dec 2009
Posts: 836
C
circuitsmith Offline
Offline
C
Joined: Dec 2009
Posts: 836
It's possible that vehicles with DBW throttle open the throttle a little to make up for compressor drag when cruising as well as at idle..


2017 Hyundai Tucson SE FWD
SuperTech synth, 5w-30, 5000mi/12mo OCI
Re: A/C Compressors [Re: Chris142] #5459801 06/22/20 11:13 AM
Joined: Dec 2002
Posts: 44,214
J
JHZR2 Offline
Global Moderator
Offline
Global Moderator
J
Joined: Dec 2002
Posts: 44,214
Originally Posted by Chris142
Originally Posted by motor_oil_madman
You feel it in my truck, especially when the engine fan kicks on 100 percent and my truck has 350hp and 650 ft lbs of torque.

Odd. Does not effect the 158hp idi in my f250. At least I can't feel it.


Lets realize that the nameplate rating, and what the engine is actually producing at a point in time, are different.

Some is related to rotational inertia, some of it is related to how hard/fast the compressor engages.

I wouldnt doubt that there is some unloader valve in some of these, similar to newer easy to start OPE, to help it come on.

Quality and design of compressor, and number of cylinders or other compressor design surely makes a difference too.

Re: A/C Compressors [Re: 2010Civic] #5459831 06/22/20 11:49 AM
Joined: Feb 2003
Posts: 9,761
C
Cujet Offline
Offline
C
Joined: Feb 2003
Posts: 9,761
The post above gets it right. The electronic tuning is designed to make it not noticeable, and to disable the compressor at higher loads. Plenty of today's vehicles use a conventional compressor, that eats up the same amount of HP as always.


People who count on their fingers should maintain a discreet silence.
Page 1 of 2 1 2
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™