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Old 04-22-2003, 10:31 AM   #1
Davenow
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Default HP potential for 2.5RS with common bolt ons?

Just out of curiosity, is 200CRANK hp a reasonable goal without going to extensive mods? What about like 190?
I am thinking that if it starts out with 165, then headers/high flow cat/catback and a cold air intake should put you somewhere around 185/190 wouldnt it? Is there any chip solution? do they do a UNICHIP type thing for the 2.5 RS? What about adding an S-AFC?
I have a buddy that is thinking of picking up a GC8 2.5RS coupe, and he is looking for a bit more punch. 190HP would be enough, but 200 would be perfect.
What kind of times would you expect from that kind of HP level on an RS? I am thinking high 14's or more likely low 15's
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Old 04-22-2003, 10:59 AM   #2
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I think 175-180 is attainable with common bolt-on mods. I figure that's about were I am with my "power" mods:
Borla Header
Borla Cat-Back
Cobb CAI
UO UD Pulley
15.5 lb Flywheel

To hit 200HP I think you would have to do cams and possibly head work, in addition to the above mods. All that will be about 3/5 the price of a used mild turbo kit.
If you were to bring the HP to 200 you could expect to hit the 14's. I think that is a reasonable assumption.

Cheers,
Chad
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Old 04-22-2003, 11:01 AM   #3
Fred Zaplitny
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In Shiv's N/A installment of project 2.5 RS (Sport Compact Car) a few years ago he was able to get about 193 hp at the crank (est) with just a Stromung cat back, a Minnam intake and an SAFC. Keep in mind the SAFC is really only helpful on MY98-99 MAF equipped cars.

Right now I have Borla header, Borla cat back, Random Tech cat, Cobb cams, underdrive pulley and SAFC and I can bet I'm well over 200 hp at the crank. I need to get my intake situated, then I will get to the track to get some numbers.
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Old 04-22-2003, 12:11 PM   #4
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As for what I'm running, I think I'm getting around 195 estimated horsepower. I don't have any engine internals or fuel mods done... just bolt ons w/ stock ECU. Stock WRXs, in my area, are running consistent 14.6-14.8 1/4 mile times; stock RS' are running around 16.2; RS' with intake/exhaust are running around 15.5-15.8. My car runs around 15.25. I can guess my mods gives me the hp right in between 165 and 227. You can see my modifications on my small site.

Last edited by kickin_81; 04-22-2003 at 12:17 PM.
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Old 04-22-2003, 02:55 PM   #5
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IIRC, Cobb's original Stage II (Cobb CAI, Borla, Random Tech, Stromung, Pulley) was dyno'd at right around 190. That's with all bolt-ons.

I'd imagine that with their new equal-length header/cat design and their upcoming ECU reflash, that their Stage II would be inching towards 200.

Of course, that's all conjecture until the headers/cat and ECU are out...

~Paul
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Old 04-22-2003, 03:07 PM   #6
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I think with cams you can hit about 200HP (with the flywheel too)
When cobb comes out with the acsessECU reflash from cobb I hope to be at 210.
When I turn 18 I'm gonna take it to the track to see how I'm doing.
Only a month away
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Old 04-22-2003, 03:26 PM   #7
DanzBorin
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you guys realize you are talking about crank power...

and that a flywheel and crank pully do not affect anything other than wheel horsepower...

because so many of you are including it...
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Old 04-22-2003, 05:18 PM   #8
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Yes we know(At least I know), but since every dyno is different, and the wheel Hp numbers for a AWD car can be misleading (ie: 95 whp stock for an RS) We are guesstamating the whp equivalent to CHP.
Does tha make sense?
In other words in stead of telling people "My RS has about 130 whp" we can just say " I'm pushing about 200 ponines"
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Old 04-22-2003, 05:54 PM   #9
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I gotta think an RS with 130 WHP has to be close to as fast and easily as fun to drive as a stock WRX wouldnt it be?
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Old 04-22-2003, 06:06 PM   #10
Fred Zaplitny
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Quote:
Originally posted by DanzBorin
you guys realize you are talking about crank power...

and that a flywheel and crank pully do not affect anything other than wheel horsepower...

because so many of you are including it...
I disagree with the crank pully statemant. Please try to make me understand. The crank pully is not a piece of the driveline.

You are right though, the flywheel will only increase your wheel HP by reducing the leaching effects of the drivetrain. It is still a necessity for the RS if you are trying to get the full potential. WHP is everything in the real world.
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Old 04-22-2003, 10:01 PM   #11
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speaking of flywheels, what kind of whp if any would it add, or will it simply allow for quicker reving, and how hard it is to install one
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Old 04-22-2003, 10:57 PM   #12
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Quote:
Originally posted by Davenow
I gotta think an RS with 130 WHP has to be close to as fast and easily as fun to drive as a stock WRX wouldnt it be?
Yes it is!

From this post!

At wheels: 139.5 HP @ 5669 RPM
Estimated at crank: 188.3 HP

Power Mods:
Cobb CAI
GFB Pulleys
Borla Header
Random Tech Cat
Brospeed Cat-Back
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Old 04-22-2003, 11:11 PM   #13
Fred Zaplitny
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Opie,
How are you estimating the crank HP? Did you have a base line run stock?
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Old 04-23-2003, 03:32 AM   #14
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Default Go over to Cobb's site

If you go and look at the dyno's for their previous stages it'll be a good reference point. You can also send them an email. Better yet: http://cobbtuning.com/impreza/powerpackages.html
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Old 04-23-2003, 02:10 PM   #15
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Quote:
Originally posted by Fred Zaplitny
Opie,
How are you estimating the crank HP? Did you have a base line run stock?
Didn't have a base line, my estimate comes from using Cobb's average on a stock 2000 2.5RS. (I know, different car, different dyno, different conditions...)

Stock (Cobb) WHP = 122.5
My Modified WHP = 139.5
Approx. 14% improvement

Stock RS HP = 165
add 14%
Estimated HP = 188.1
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Old 04-24-2003, 05:26 AM   #16
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Quote:
Originally posted by Davenow
I gotta think an RS with 130 WHP has to be close to as fast and easily as fun to drive as a stock WRX wouldnt it be?
I can't help but think a 227 HP RS w/ our 4:11 gears would launch faster than a stock WRX, then the 'rex's 3:90 gears would end the debate quickly with the RS a looser...

ONLY if the WRX wasn't 300 pounds heavier! Just a guess
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Old 04-24-2003, 10:14 AM   #17
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Well, most sane races dont end up much over 100MPH, so I think a 227HP RS would tear a WRX a new one, but thats my opinion, and I wouldn't know because my only power mods for now are a Ganz CAI w/ K&N filter, PROECM Chip, Borla Header, Stromung Catback, and Mr Josh's Pulley. But I'm going to be doing something about my cats and buying street cams, an ACT clutch, and a Exedy Flywheel shortly. I may replace the Ganz with a Cobb Intake if my butt dyno results after all of this aren't very satisfying.
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Old 04-24-2003, 03:58 PM   #18
Andrew Bacon
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Keep us posted, I want those very items on mine
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Old 04-24-2003, 04:03 PM   #19
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i noticed a huge difference in power on my old ej18 powered legacy with a straight through exhaust and k&n and cold air intake
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Old 04-28-2003, 07:24 PM   #20
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I have a 4EAT (with modified Torque Converter and tranny cooler) but my power mods are:
Cobb CAI
Borla Header
Cobb cat-back exhaust w/mid pipe
Random tech hi-flow cat
Cobb Cams
GFB Pulleys
ProECM

Can anyone guess what my numbers would be considering my drive train loss?
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Old 04-29-2003, 01:51 AM   #21
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Cams are a must to reach 200HP. That's what I'm getting in a week or so.
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Old 04-29-2003, 02:26 AM   #22
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I also have a 4EAT (2002), and I have:

Stromung catback
Ganzflow w/ K&N filter
Lightened Crankshaft pulley
Ground mod!!!

I guess I'm not running much more than 175 HP to the crank and 120 to the wheels, but those are just estimations.
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Old 04-29-2003, 02:52 PM   #23
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Quote:
Originally posted by kickin_81
As for what I'm running, I think I'm getting around 195 estimated horsepower. I don't have any engine internals or fuel mods done... just bolt ons w/ stock ECU. Stock WRXs, in my area, are running consistent 14.6-14.8 1/4 mile times; stock RS' are running around 16.2; RS' with intake/exhaust are running around 15.5-15.8. My car runs around 15.25. I can guess my mods gives me the hp right in between 165 and 227. You can see my modifications on my small site.
just FYI, I pulled a 15.3 time with just my Rallispec intake and the SOA/Bosal exhaust (MY00 RS)

This year I'll see what I can get from that, but with a full 2.5" cat-back with Brullen muffler. Might take off 0.1 sec.

I also assume i'm pushing 175hp.
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Old 04-30-2003, 04:50 PM   #24
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New times with just my Injen intake. This time I removed my spare tire, jack, and the front plates that block the hood scoop and vents. Other then that, the car is stock. Also had 3/4 tank of gas.

Track conditions: Low 50 degree weather, medium humidity, 50-60ft above sea level In Portland, Oregon.

R/T--------.610
60'--------1.979
330'------6.039
1/8-------9.465 at 71.37 mph
1000'----12.459
1/4--------15.005 at 88.51 mph

@ Portland International Raceway on 4/18/03

So, no clue what kind of hp I have, but I drive my car well, and I think I got a happy one from the factory.
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Old 04-30-2003, 05:04 PM   #25
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Quote:
Originally posted by svxr8dr
I have a 4EAT (with modified Torque Converter and tranny cooler) but my power mods are:
Cobb CAI
Borla Header
Cobb cat-back exhaust w/mid pipe
Random tech hi-flow cat
Cobb Cams
GFB Pulleys
ProECM

Can anyone guess what my numbers would be considering my drive train loss?
SVX, I had a very similar setup and I made 147hp and 159 lb-ft on a Mustang dyno (FI-Systems, McKinney TX... Cobb's Texas replacement). With the 4EAT and the Borla I'd bet you'll come in a little lower on both hp and tq and your powerband will be very different than mine (area under the curve) due to the slushbox.
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