|
|
|
|
Thread Tools | Display Modes |
12-10-2001, 04:19 AM | #1 |
Scooby Newbie
Member#: 12968
Join Date: Dec 2001
|
How many HP does air-conditioning "take away"?
Hi all,
Does any of you know how many HP and torque does the air-conditioning take away when you turn it on? Has this been verified by dyno runs at all? Since the first day I got my car, I notice the A/C takes away NOTICABLE power from the car. Boost response is slower, shifting is 'rougher' (revs dip down more quickly). My A/C is installed by the local dealer. Could this be the problem? Thanks all in advance!!!
* Registered users of the site do not see these ads.
|
12-10-2001, 04:37 AM | #2 |
Scooby Guru
Member#: 6551
Join Date: May 2001
Chapter/Region:
MWSOC
Location: Carol Stream, IL
Vehicle:'01 GC8 Dinged STM '09 Concours 14 ABS Black |
the average number is 15...but why turn it on when you are racing?? A/C always takes HP to run...and you'll notice it more on a smaller engine wether it be turbo or NA.
So don't turn it on. and for those of you who say take it of...tell me what the coefficient of friction of a sealed ball bearing is. Jeremy |
12-10-2001, 04:41 AM | #3 |
Moderator Member#: 922
Join Date: Feb 2000
Chapter/Region:
MWSOC
Location: Schaumburg, IL
Vehicle:16 WRX (white) 04 FXT (red) |
I might be mistaken, but I thought that the WRX incorporated the same as the 2.5 RS's had, which was that it electronically disengaged the AC while at WOT (the light doesn't turn off, you just get the power). Maybe you're having phantom power anxeity attacks.
|
12-10-2001, 06:35 AM | #4 |
Scooby Newbie
Member#: 9295
Join Date: Aug 2001
Location: Friendship, MD
Vehicle:2002 WRX WR Blue w/paint chips! |
yep
8complex is right. look in your owners manual under AC..it should say what 8complex said.
|
12-10-2001, 08:45 AM | #5 | |
Scooby Newbie
Member#: 12968
Join Date: Dec 2001
|
Quote:
First of all I'll admit I don't know what WOT stands for. I assume it's something like "full throttle acceleration"? If so, then perhaps the AC is disenganged, because at such high-G pull, the difference at full-throttle acceleration could be attributed to psychological. HOWEVER, at lower RPM's I still firmly believe that with the AC on, the turbo/throttle response is reduced significantly (I really wish you guys can try out my car, it's really disappointing with AC on). While crusing for e.g., then I want to overtake the car in front (NOT blow him away), I'd press the accelerator gently (NOT full throttle), and wait (and wait and wait and wait) for the turbo to spool up to around 3.5 - 4 K rpm if the AC is on. I try turning the AC off if I can. But, living in a tropical country, I sometimes find the weather gets too unbearably hot. |
|
12-10-2001, 08:55 AM | #6 |
Scooby Newbie
Member#: 12968
Join Date: Dec 2001
|
Just found out WOT = wide open throttle (did a 'search' function: I've seen enough 'fires' aimed at people who don't do search)
So anyone cares to define when a wide open throttle occurs? <This question might be stupid to some of you; I'm not exactly technically informed> When I press the accelerator down fully ("pedal to the metal") at 1,000 rpm, does that count as WOT? |
12-10-2001, 09:13 AM | #7 |
Scooby Newbie
Member#: 12620
Join Date: Nov 2001
Location: Des Allemands, La
Vehicle:2004 STi Aspen White |
WOT = WFO
So anyone cares to define when a wide open throttle occurs?
<This question might be stupid to some of you; I'm not exactly technically informed> When I press the accelerator down fully ("pedal to the metal") at 1,000 rpm, does that count as WOT? [/b][/quote] WOT is Wide Open Throttle. In other words, when you nail the gas (to the floor) , the throttle is fully opened. It's the G-rated version of WFO. Now, WOT, at 1000 rpm, will result in something less than exciting, unless you're driving a large-displacement engine with gobs of torque. Small engines (like ours) typically make power at higher rpms, so you've got to spin the engine to produce similar acceleration. Now, assuming you have a 5-speed, aquaint yourself with the engines characteristics. If you're looking for more passing power, try downshifting 1 or 2 gears. Of course, apply common sense here. If your speed is high, >100, I wouldn't recommend downshifting, but that will depend on your skill level. Take some time to learn what your car wants from you in order to perform the way you want it to. It is recommended that you experiment with high-speed on a closed course, IE: race track, abandoned highway, parking lot, etc. The WRX is a blast to drive, but it's not a big-block Chevy or a Hemi. (This is not a slam, just reality, so save your flames.) You've got to drive with the power in the right band to realize its full potential. Now, if you have an automatic, you have my condolences. Curtis |
12-10-2001, 09:14 AM | #8 |
Scooby Specialist
Member#: 3319
Join Date: Dec 2000
Location: Tarpon Springs, FL, USA
|
I dyno tested my VW VR6 about 2 years ago both with an without the AC on.
It lost 7 wheel hp across the board with the AC compressor on. |
12-10-2001, 09:23 AM | #9 |
Scooby Specialist
Member#: 6049
Join Date: Apr 2001
Chapter/Region:
MWSOC
Location: Jenison.Doomhammer
Vehicle:02 WRX & 99 RS Black |
The service manual makes no mention of the ac going out at WOT. The owners manual...I dunno...
but the service manual mentions the 7k ecu cut out (turns off the compressor). No other... and I've mentioned this before but people have reported slower 1/4 mile times with ac on... |
12-10-2001, 10:44 AM | #10 |
Scooby Newbie
Member#: 12968
Join Date: Dec 2001
|
Thanks everybody for the info so far.
Now I've got a ballpark figure of the HP loss (I'd say around 10HP, right?). More importantly, now my butt-dyno 'recognizes' what a 10HP loss/gain feels like I know the WRX would be more fun if I constantly shift to the 'torquey' RPM range. However, I use my WRX as a daily driver (like most of us I assume), not an all-out racer. I get stuck in a snail-paced traffic more often than I'd like to. It'll be really tiresome if I'm crawling at 2nd gear, and I need to shift lane, I'll have to shift into 1st. It's not very practical. Besides, I think in the long run it won't do the tranny any good if I do that 3-4 times a day, 5 days a week. Actually in an auto-tranny the process is simpler, no?? Just press on the accelerator and it'll automatically downshift. Moreover, today's auto tranny seems to have 'fuzzy logic' or something... it reacts to how hard you slam on the accelerator and adjust its shifting accordingly. |
12-10-2001, 03:22 PM | #11 |
Scooby Specialist
Member#: 12896
Join Date: Dec 2001
Location: Santa Barbara, CA
Vehicle:02 Impreza WRX Platinum Silver |
What is it that scares me about the words Fuzzy Logic and Transmission all put into one sentance? Does that mean its logic is fuzzy as in not completly sure what the freak its doing half the time? Or is it Logic and transmission? Are transmissions logical? I THINK NOT!
Sorry I just hate automatic transmissions they are retarded. |
12-10-2001, 08:11 PM | #12 |
Scooby Specialist
Member#: 7555
Join Date: Jun 2001
Chapter/Region:
South East
Location: Charlotte NC
|
AC on - Auto-x past Saturday!
Here's , my take on it: I had a total of 7 runs this past Sat at an Auto-x. My last run I put the defroster on so the engine fans would kick in and cool the radiator while I was staging. My turn came up and that was the smoothest damn run out of the day that I had and I was so happy.
After the finish of the run I was shocked that it was another 38 second run I just couldn't believe it! And then it hit me, I looked down and realized my AC and defroster buttons were pushed in and the radiator fan still running. Man was I pissed The AC on takes power for sure! |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
how many HP is a WRX turbo rated at? | Impreza94L | Normally Aspirated with bolt-on Forced Induction Powertrain | 1 | 10-25-2002 02:06 PM |
How many HP will this make? | setiawani | Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) | 17 | 09-06-2002 03:48 PM |
How Many CFM's of air does the stock WRX turbo put out? | BrysImpreza | Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo) | 0 | 09-02-2002 06:55 PM |
Take a look at this...How many HP??? | GreatStreets | Mid West Subaru Owners Club Forum -- MWSOC | 4 | 01-15-2002 11:18 AM |
How many HP does a stock MY99 have at the wheels?? | Xscreamer | Normally Aspirated Powertrain | 5 | 04-18-2001 12:17 AM |