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Old 04-29-2001, 09:28 PM   #1
IMPREZA GUY
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Post 200+ HP in an NA impreza

does anyone know if this could be possible, with cams, and headers, and CAI with exhaust and such???, because Cobb tuning list all these engine parts that make it seem like an impreza can go past 200+ before turboing it
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Old 04-29-2001, 09:34 PM   #2
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How much money do you have? If you want to play, you've got to pay! So to answer your question, yes it is possible to stay N/A and have over 200HP. Whether it remains streetable or (emissions) legal is another question.

LaterZ!
Darren!!
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Old 04-29-2001, 10:01 PM   #3
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A CAI, headers, cat-back exhaust, SAFC and Cobb Cams will put you just over 200 hp. A lightweight flywheel/underdrive pulley combo helps in the real world, although they don't really show up on the dyno, especially in higher gears. Internal engine mods can put you right around 250 hp, but they get pretty costly. I'm planning on staying NA and currently have the bolt-on stuff listed above. Cylinder heads are next on the list, which should take it to around 230-235 hp. So yes, it is pretty easy to make 200 NA hp.
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Old 04-29-2001, 10:15 PM   #4
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One of the old issues of Sport Compact Car showed that by adding and intake, exhaust, and S-AFC you can get to 200 hp (or pretty darn close.)

They used the Minnan intake, Stromung dual tip, and the Apexi (I think; correct me if I am wrong.)

Wasn't it even Shiv's car that did it? I think it was...
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Old 04-29-2001, 10:16 PM   #5
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yup i have calculated about 6000 in engine bolt on mods, and that is just power and not the other internal engine mods to help it run better, but so far i just have a ganzflow, and a underdrive pulley that i can't seem to install since i drive an Auto
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Old 04-30-2001, 03:16 AM   #6
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Underdrive pulleys work on auto cars as well.
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Old 04-30-2001, 06:29 AM   #7
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sorry lemme refrase, the pulley, i know it works for my car, but unfortunately the do it yourself install, i got stuck 3/4 of the way because i couldn't get the last belt off, and i didn't have a 22mm socket head or wrench
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Old 04-30-2001, 12:20 PM   #8
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FWIW the SCC issue only dynoed ~20hp for the exhaust, intake and SAFC. Far short of 200.
200 hp NA take quite a bit to do NA, far from impossible, but if you think you're getting 200hp without changing the head or cam, you're kidding yourself.
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Old 04-30-2001, 03:12 PM   #9
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umm who are you refering to? did you read my first post???
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Old 04-30-2001, 03:46 PM   #10
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Take a look at the most recent SCC. There is something called Brake Specific Fuel Consumption. Without going to larger injectors, even with an optomistic BSFC, we will max out around 196hp w/o head work( Headwork would change that #). The examples Shiv uses in the article, while they refer to a civic, are actually true numbers for our 2.5RS's. He mentioned this once before in one of his project Impreza Articles as well.
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Old 04-30-2001, 04:13 PM   #11
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200hp with a stock redline? Probably not.

200hp with a 7000rpm redline? Sure.

Hope you have money.
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Old 04-30-2001, 04:26 PM   #12
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wait doesn't the WRX redline at like 6??? with 227hp?
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Old 04-30-2001, 04:40 PM   #13
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Okay.. first of all the WRX is Turbo.. whole different ballgame, secondly it redlines at seven.

Thirdly you CAN get past 200HP with less than a 7000 redline, AndreRS01 has done it.. he ran a 14.46 1/4 mile.. Look in this forum for it.. he talk about all his mods.

*shrug*
Korey
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Old 04-30-2001, 04:46 PM   #14
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directed mainly at rs25.com
-B
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Old 04-30-2001, 08:45 PM   #15
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2.5RS + Cobb Tuning stage 1 kit = 200HP

easy yet expension equation
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Old 04-30-2001, 09:27 PM   #16
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went to the cobbtuning website, looked up the info on the cobb tuned special edition 01RS,
Cold Air Intake System
Cat-Back Dual Tip Exhaust
185 HP @ 5600 RPM , 181 Ft-Lbs TORQUE @ 4000 RPM
ADD:
Stainless Steel Performance Headers
Power Pulley Kit
192 HP @ 5600 RPM , 190 Ft-Lbs TORQUE @ 4000 RPM

don't know how acurate the info is, just cut and pasted it from cobb's website. seems like a nice way to go (at least to me).

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Old 04-30-2001, 09:44 PM   #17
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Cobb's numbers sound right.
192 with all the usual bolt ons before going with the heads and cams.

stage III (216-226)

Ready to break the 200HP barrier without running turbo or nitrous? With our Stage 3 package, we utilize our well-proven Street Performance Camshaft and Cylinder Head package to give you the performance you need without reducing your reliability or daily driven manners. On the dyno, this package provides an additional 50-60HP over stock, with equivalant torque gains. At the drag strip, cars running this package have typically run mid to low-14 second 1/4 mile times in full street trim.
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Old 05-01-2001, 07:09 PM   #18
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Longshot-

How are you measuring that gain? It sure ain't at the wheels...at least, not according to Cobb's graphs...
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Old 05-01-2001, 07:25 PM   #19
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Matt- Shiv's article on injector size in SCC is immediately followed by an addendum that notes that fuel pressure is also a factor. So while 192 bhp may be the limit on 280cc injectors at stock fuel pressure, a new fuel pump and fuel pressure regulator should give you a fair amount of fuel to play with

-Kurt.
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Old 05-01-2001, 09:54 PM   #20
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OH MY! headers, CAI and exhaust equal about 190?? that is where i want to be
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Old 05-01-2001, 11:42 PM   #21
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i'm sure andresRS01 will see this thread soon
andres is using stock fuel mngmnt syst.
i don't think he is at 200hp just yet but i'm sure it will come.(if tht kid doesn't buy the MY01 for 27K)
once he gets a a/m ecu (cobb's or techII) i'm pretty sure he will go 200hp+ maybe high 13's
figure 3K for every second lost in the 1/4mile-----excluding no2
steven
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Old 05-02-2001, 05:40 AM   #22
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Okay.. I don't know why my name was brought up or what "gain" I measured.. but measuring power to the wheels in and AWD care requires more math than most ppl really need to get into.

To put it bluntly and answer the original point of this topic.. yes its possible, you don't need to change the rev-limiter, and screw what you get at the wheels.. if you have a quarter mile of 14.46 you are past 200HP.

You guys need to not blow everything out of proportion or think you have the end all answer to tuning and HP numbers. I certainly don't.. but his question was simple, and obviously so...

*shrug*
..flame on..

Korey


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Old 05-02-2001, 09:18 AM   #23
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Cool

Just a couple of observations here:

A fully tuned Cobb model out of the dealer is rated at 192HP, which comes with CAI, Borla Headers, Full Catback system and Underdrive Pulley (not to mention the appearance and suspension enhancements included in the package).

Now if you add headwork and cams to the equation, how can you still be below 200HP. Even if the 192HP rate is a bit optimistic, you still have to be over 200HP.
The street cams along (Andres is running these cams) are good for 14 peak HP, and 19 max gain. The heads should be around 20HP. Of course we cannot just add these numbers together, but I think it is very realistic to estimate a good 205-215HP in Andres engine. Also, he has the timeslip to back it up.
Andres' best run was 14.46. If you think about the weight of the car and compare to other cars running similar numbers, the HP figures become very realistic. Remember that a stock RS will run high 15s to low 16s.

Just something to think about!

Cheers,
Marco
Aspen White '01 Cobb Tuned Impreza (#1)

[This message has been edited by Marco (edited May 02, 2001).]
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Old 05-02-2001, 03:06 PM   #24
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Darshu,
You are correct that those changes would change the duty cycle of injectors and without doing the math I couldn't tell you where that would put you. But if you are going to bother changing the fuel pump, why not do the injectors as well?

I guess I was a little too subtle with my original point which was larger injectors should be included on the list for a 200+HP NA build-up, not that it wasn't possible.

Personally, I would like to find an injector between Shiv's 550's and our stock injectors that would work on the stock fuel rails. I figure 400-450cc would help with the power without destroying daily fuel economy.
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Old 05-02-2001, 04:50 PM   #25
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OK, Longshot...no need to get upset.

The only reason I'm even arguing this point is that we seem to be trending towards a certain type of math...

You can't just add up gains from different graphs. That's not how it works.

Trey HAS tuned a car to the point where it's producing 170-180hp at the wheels. If you play with the numbers, that gives you "205"hp "at the crank." But that's making peak power way up there (relative to stock, anyway) on a car with a raised redline with EVERY N/A buildup possible. Oh, and did I mention the aftermarket ECU?

There's a reason I said, "probably not" instead of "no."

(BTW, drag racing has as much to do with gearing...and tires...and weight...as it does with engines. That's why it's hard to take actual HP numbers from a quarter mile time. LOTS of variables, some more important than others.)
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