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06-16-2008, 10:17 PM
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#1
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Join Date: Mar 2008
Location: Somerset, NJ
Posts: 4,223
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who here believes this
a good friend of mine didnt put AC in his iroc because he believes it 'reduces power'...is this fact or fiction?
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Jon
1999 Trans am WS6
1996 Corvette LT4 6 speed
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06-16-2008, 10:51 PM
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#2
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,368
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ya thats true. plus its added weight. its more of a load on the engine, esp. with the a/c on.
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06-16-2008, 11:01 PM
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#3
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Join Date: Mar 2008
Location: Somerset, NJ
Posts: 4,223
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Quote:
Originally Posted by sweetbmxrider
ya thats true. plus its added weight. its more of a load on the engine, esp. with the a/c on.
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how much of a horsepower loss are we talking here though, guesstimate
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Jon
1999 Trans am WS6
1996 Corvette LT4 6 speed
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06-16-2008, 11:02 PM
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#4
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Meet Coordinator
Join Date: Jan 2008
Location: brick/pt. pleasant beach
Posts: 19,368
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no idea but with the a/c on, i can seriously feel the difference in power. with it off, its tenths of seconds off your et.
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06-17-2008, 01:58 AM
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#5
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2007 Member of the Year
Join Date: Oct 2004
Location: Seabrook, TX
Posts: 14,281
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On fourth gens its only a coupel hp.... but a big amount of weight and clutter.
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WF=DF
Kommandant of the ACL (Anti Canadian League)
Quote:
Originally Posted by LTb1ow
Junk the pos, spend the money on beer, acquire headache.
Same result cept this headache doesnt last months.
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06-17-2008, 11:53 AM
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#6
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Banned
Join Date: Mar 2007
Location: coumbia. nj
Posts: 1,317
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and gas mileage.
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06-17-2008, 12:04 PM
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#7
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2007 Member of the Year
Join Date: Oct 2004
Location: Seabrook, TX
Posts: 14,281
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Don't just take our word for it, I'll break it down.
The engine's internal combustion cycle makes power and moves the crankshaft
Any pulley-driven accesory is spun by this movement of the crankshaft
It takes energy to spin these other pulleys
Therefore, when you take away the resistance/drag of, say, the a/c pulley, you free up that much energy that the crank was using to turn it
__________________
WF=DF
Kommandant of the ACL (Anti Canadian League)
Quote:
Originally Posted by LTb1ow
Junk the pos, spend the money on beer, acquire headache.
Same result cept this headache doesnt last months.
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06-17-2008, 12:07 PM
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#8
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Your A/C unit should have a magnetic clutch that allows it to free-wheel when it's not in use. So it may be 1-2 hp loss (I guess?).
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06-17-2008, 02:09 PM
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#9
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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Quote:
Originally Posted by WildBillyT
Your A/C unit should have a magnetic clutch that allows it to free-wheel when it's not in use. So it may be 1-2 hp loss (I guess?).
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Wooooo..that's cat like HP savings!
Race car - kill the AC - it's more about the ~50 pounds (if you get it all out) then the parasitic loss
Street car - save it if you can - and it helps resale.
JMO.
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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06-17-2008, 03:24 PM
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#10
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Join Date: Mar 2008
Location: Somerset, NJ
Posts: 4,223
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Quote:
Originally Posted by BonzoHansen
Wooooo..that's cat like HP savings!
Race car - kill the AC - it's more about the ~50 pounds (if you get it all out) then the parasitic loss
Street car - save it if you can - and it helps resale.
JMO.
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thats understandable...but it sucks because "my friend" is the dude that actually that car and that's the one that i bought. So its more of a "weekend warrior", so its half for driveability and have for racing. But i can live without ac, the only thing is my girlfriend hates it when her pretty hair gets all frizzy in the summer
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Jon
1999 Trans am WS6
1996 Corvette LT4 6 speed
Last edited by madness410; 06-17-2008 at 03:24 PM.
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06-17-2008, 11:30 PM
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#11
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Join Date: Feb 2008
Location: Brick
Posts: 415
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I hate using the a/c. ttops and windows is the way to go.....cept when ur sitting in traffic. waiting for some free time to rip mine out.
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06-18-2008, 12:24 AM
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#12
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Resident Camera Guy
Join Date: Aug 2004
Location: North Jersey
Posts: 10,971
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Only reason mine is out is because the core leaked and I was unable to re-charge it without it costing an arm & a leg. T-Tops rule anyway.
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07-16-2008, 06:07 AM
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#13
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Join Date: Aug 2004
Location: Hawthorne, New Jersey
Posts: 516
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Two words, **** that.
;[
Seriously, have been down that road and done that with the 89. "ohhh saves horse power" "ohhh less weight". Well yeah.. All true facts..weight being the better of the two sattements.
Will you notice the difference in power with the ac ON? Yes. Will you notice the difference in power with the ac OFF and the pulley freewheeling? NO. I know you dont, since I went that route with my 89.
Also if you have a later model 3rd gen, or a 4th gen that has one belt you have two options for deleting the AC..buying a delete pulley OR trying to find a new belt routing to bypass the AC. Using stock accessories that may or may not be possible. If you go the delete pulley route it is the same as having AC and just not turning it on. Again the only true savings would be the weight
In the end IMO having no AC on a car that is anything but a all out race car is pointless. If it works, keep it. If you want to have it and it doesnt work,f ix it. T-tops ROCK, I wont lie. Windows down are fun too, its one thing i miss from my third gen, as the 93 is a hardtop. BUT..I dont care who you are..when your driving along on a 120 degree day with the tops off and windows down its ok to say the least..however once you stop..sayyyyyyyy sitting on the parkway in shore traffic..it SUCKS.
However if you still want to take out your AC for watever reason..(and remember..chicks dont likeeee ittttttt) do yourself a favor..pull it ALL out and bring it to the scrap yard, the price of alum is high enough right now that with the condens/evap/lines and the insides of the compressor if your crazy like me are all alum. Might get ya a few bucks. I use the guy on midland ave in garfield just as a suggestion.
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07-16-2008, 08:36 AM
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#14
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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+1 AC good for resale, too. If you don't remove it all then the 'savings' is nill. It's purely a weight thing. The EFI cars even shut off the AC at 80% TP (or something like that)
And old cars have big heavy brass condensors...the one out of my 77 must weigh 3x more then a 4th gen one. the little R4 compressor is probably the heaviest thing in the 4the gen AC system.
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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07-16-2008, 12:23 PM
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#15
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Join Date: Jul 2005
Location: Woodbridge
Posts: 595
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At highway speeds I think the A/C is more efficient than windows or t-tops on account of the drag that the open windows produce. Something to think about.
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~Joe
95 3.4L Firebird
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07-16-2008, 12:29 PM
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#16
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Join Date: Mar 2008
Location: Somerset, NJ
Posts: 4,223
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Quote:
Originally Posted by jola
At highway speeds I think the A/C is more efficient than windows or t-tops on account of the drag that the open windows produce. Something to think about.
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ive heard about that too...does anyone know if ac restricts gas mileage? i drove from my house to mountain creek yesterday with the windows up and ac blasting and i got terrible gas mileage
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Jon
1999 Trans am WS6
1996 Corvette LT4 6 speed
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07-16-2008, 01:04 PM
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#17
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,165
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It is commonly accepted theory that at highway speeds AC on/windows up is more efficient than windows down/no AC due to aerodynamic drag. Of course windows up/AC off is the best bet!
Still though, the #1 roadblock to good MPG is the skinny pedal on the right.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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07-16-2008, 06:36 PM
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#18
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Join Date: Dec 2005
Location: Boston/North
Posts: 9,214
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I've heard that the best thing to go by is AC at 35-40+ and windows down at anything below that
but don't hold me to it
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Quote:
Originally Posted by BonzoHansen
dumbass.
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07-16-2008, 08:11 PM
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#19
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Join Date: Nov 2004
Posts: 3,530
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Didn't they do a test on mythbusters on this subject a while back?
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07-19-2008, 11:57 AM
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#20
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11 Second Club
Join Date: Aug 2004
Location: Pitman, NJ
Posts: 587
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Quote:
Originally Posted by camaro2you
Didn't they do a test on mythbusters on this subject a while back?
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Yes and they proved that the car with no AC and windows down got better gas mileage, by far. I suppose you could also take into factor that various cars/trucks may get different results. Another vote from me on keeping the A/C if it works... I pulled mine out because it didnt work right and I was frequently messing with the motor and it always got in the way.
I did a similar experiment last week with my power steering. Surely the pump robs HP, right? I bypassed it and the car ran exactly the same ET.
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07-19-2008, 07:51 PM
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#21
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,476
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Quote:
Originally Posted by Slow Z
I did a similar experiment last week with my power steering. Surely the pump robs HP, right? I bypassed it and the car ran exactly the same ET.
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From what I've read, the pump doesn't have much of a load on it when you aren't turning the wheels, so for drag racing the parasitic loss is the pretty much nothing. But a manual box is lighter than the power setup
- Justin
__________________
1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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07-21-2008, 09:55 PM
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#22
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Stalker
Join Date: Aug 2004
Posts: 12,082
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my SS will always have AC. currently it isnt charged and theres no belt for it. One of the idler pullies got wasted whn my balancer came off and i havent gotten around to replace it yet. but evetually i will and then put the belt on and recharge the system and enjoy ice cold air while violating other cars on the road
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07-21-2008, 10:06 PM
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#23
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I <3 sheep
Join Date: Mar 2005
Location: Belmar
Posts: 4,907
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Quote:
Originally Posted by Tru2Chevy
From what I've read, the pump doesn't have much of a load on it when you aren't turning the wheels, so for drag racing the parasitic loss is the pretty much nothing. But a manual box is lighter than the power setup
- Justin
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and I think manual steering in a race car gives you a much better feel of the track, and a slightly better chance of you not over correcting if the car gets a little loose.
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Quote:
Originally Posted by Tru2Chevy
Steve has a thing for sheep....
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'78 Big Wheel- 2FWFP
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07-22-2008, 09:44 AM
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#24
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Join Date: Jul 2008
Location: NJ
Posts: 819
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I pretty much always use the a/c in my truck. I can feel a difference in power, but oh well. It restricts gas mileage as well. I think its worth it to be cool in the summer and not sweating. My r-12 system is very cold which I like. I almost removed a/c, but i realized it was worth maybe 1-2 mpg for not using it so its not worth the effort
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07-23-2008, 12:02 AM
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#25
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12 Second Club
Join Date: Aug 2004
Location: West Milford
Posts: 8,373
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hmmm my question is.... is keeping it on reg AC or MAX AC better for gas milage?
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88 Camaro
95 Impala SS
97 Trans Am WS6
98 Blazer ZR2
00 Corvette
04 CTS-V
04 Grand Cherokee
06 GMC Sierra
07 Sublime Charger Daytona
12 Tahoe LT
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