Welcome to the North American Subaru Impreza Owners Club Thursday March 28, 2024
Home Forums Images WikiNASIOC Products Store Modifications Upgrade Garage
NASIOC
Go Back   NASIOC > NASIOC Technical > Factory 2.0L Turbo Powertrain (EJ Series Factory 2.0L Turbo)

Welcome to NASIOC - The world's largest online community for Subaru enthusiasts!
Welcome to the NASIOC.com Subaru forum.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, free of charge, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!

If you have any problems with the registration process or your account login, please contact us.







* As an Amazon Associate I earn from qualifying purchases. 
* Registered users of the site do not see these ads. 
Reply
 
Thread Tools Display Modes
Old 12-10-2001, 04:19 AM   #1
GDB
Scooby Newbie
 
Member#: 12968
Join Date: Dec 2001
Default 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.
GDB is offline   Reply With Quote
Sponsored Links
* Registered users of the site do not see these ads.
Old 12-10-2001, 04:37 AM   #2
HndaTch627
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

Default

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
HndaTch627 is offline   Reply With Quote
Old 12-10-2001, 04:41 AM   #3
8Complex

Moderator
 
Member#: 922
Join Date: Feb 2000
Chapter/Region: MWSOC
Location: Schaumburg, IL
Vehicle:
16 WRX (white)
04 FXT (red)

Default

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.
8Complex is offline   Reply With Quote
Old 12-10-2001, 06:35 AM   #4
100 watt warlock
Scooby Newbie
 
Member#: 9295
Join Date: Aug 2001
Location: Friendship, MD
Vehicle:
2002 WRX
WR Blue w/paint chips!

Default yep

8complex is right. look in your owners manual under AC..it should say what 8complex said.
100 watt warlock is offline   Reply With Quote
Old 12-10-2001, 08:45 AM   #5
GDB
Scooby Newbie
 
Member#: 12968
Join Date: Dec 2001
Default

Quote:
Originally posted by 8Complex
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.
Really? I didn't know that... I'll check my manual next time.

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.
GDB is offline   Reply With Quote
Old 12-10-2001, 08:55 AM   #6
GDB
Scooby Newbie
 
Member#: 12968
Join Date: Dec 2001
Default

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?
GDB is offline   Reply With Quote
Old 12-10-2001, 09:13 AM   #7
Curtis
Scooby Newbie
 
Member#: 12620
Join Date: Nov 2001
Location: Des Allemands, La
Vehicle:
2004 STi
Aspen White

Default 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
Curtis is offline   Reply With Quote
Old 12-10-2001, 09:14 AM   #8
4sfed 4
Scooby Specialist
 
Member#: 3319
Join Date: Dec 2000
Location: Tarpon Springs, FL, USA
Default

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.
4sfed 4 is offline   Reply With Quote
Old 12-10-2001, 09:23 AM   #9
JenisonWRX
Scooby Specialist
 
Member#: 6049
Join Date: Apr 2001
Chapter/Region: MWSOC
Location: Jenison.Doomhammer
Vehicle:
02 WRX & 99 RS
Black

Default

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...
JenisonWRX is offline   Reply With Quote
Old 12-10-2001, 10:44 AM   #10
GDB
Scooby Newbie
 
Member#: 12968
Join Date: Dec 2001
Default

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.
GDB is offline   Reply With Quote
Old 12-10-2001, 03:22 PM   #11
Evaider
Scooby Specialist
 
Member#: 12896
Join Date: Dec 2001
Location: Santa Barbara, CA
Vehicle:
02 Impreza WRX
Platinum Silver

Default

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.
Evaider is offline   Reply With Quote
Old 12-10-2001, 08:11 PM   #12
Division By Zero
Scooby Specialist
 
Member#: 7555
Join Date: Jun 2001
Chapter/Region: South East
Location: Charlotte NC
Default 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!
Division By Zero is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

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

All times are GMT -4. The time now is 06:22 AM.


Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Powered by Searchlight © 2024 Axivo Inc.
Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc.

As an Amazon Associate I earn from qualifying purchases.

When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission
Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.