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Old 11-17-2001, 12:08 PM   #1
F355DUDE
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Default How can I get 200hp?

Hi, I have a 1998 2.5 RS and about $500 to spend on engine mods. What is the most HP/tourque I get for that amount? Are K&N airfilters good too? Thanks a lot
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Old 11-17-2001, 12:51 PM   #2
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For that much money, Intake, Air Filter (can't comment on the K&N as I have an Amsoil filter), lots of stickers(almost 200hp right there), and Underdrive pulley will probably use about all of it as far as straight line speed on a budget.

My suggestion, 18-22mm adjustable sway bar (corrects a lot of the understeer), intake and air filter, and spend the rest autoxing or at a performance driving school learning the limits of the car. (That last one is the best of all)

Now, for the 200hp, you are going to have to drop some $$$ to squeeze out 200hp. How fast you want to go depends on how much you want to spend.

Hope that helps

Dave

P.S. For gods sake, if you still have the RE-92s on your car then scrap all of this and get good tires.
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Old 11-17-2001, 01:28 PM   #3
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I figure that you can get close to 200 w/ a full exaust(header, hi-flo cat, midpipe, and hi-flo muffler), lightweight pulleys, and intake... that'll get you 190 or 195, I'd think... the power chip from imprezars.com might get you up to 200... I don't know for sure, but in any case, it's going to be more than 500 bux... you can also go w/ cams, but I don't know of any for a 98. for what you have, I would suggest, catback exhaust and an intake(but be careful of your MAP) that's where you'll see the most gains for that money...
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Old 11-17-2001, 01:35 PM   #4
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You are very very very very unlikely to hit 200 without exceeding your fuel injector duty cycles, or adding addtional fuel via higher pressure, etc. Mid 190's are possible apparently.

For $500... buy an intake. 98 intakes are sorta hard to find.
Go down to the mufflershop and have them make you a 2.25" catback with mandrel bends (you wont be able to afford a pre made one and get the intake) Either or cruise the private classifieds and hope stuff comes up.
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Old 11-17-2001, 03:31 PM   #5
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brian i would bet your car is pushing close to the 200 @ the flywheel with those cams alone.....we'll have to do a motor dyno day and see what those cams do @ the flywheel.
'
JEremy
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Old 11-17-2001, 03:43 PM   #6
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Cams.
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Old 11-17-2001, 03:52 PM   #7
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Keiho, it is a DOHC so that puts him at $799 for the cams. If he had a budget of $800 I would have said cams too.

edit: Sorry, just realized that you probably meant for how he would get to 200hp. All apologies.
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Old 11-17-2001, 05:13 PM   #8
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Thanks for the info. I would really like to know about the K&N air filters. I heard they give an extra 20hp to your car. thanks a lot.
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Old 11-17-2001, 05:22 PM   #9
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By January of 2002 I'll be pushing that much outta my 98 RS. I have the chip and intake for the 98 from www.imprezars.com . Larry sells good products. Then I have coming header from borla, pulley set, and the cat-back. I should be getting the cams in about a month. After that.... I'm not sure what I'll do. I'll either go nitrous... or more likely the expensive route and get either a turbo or new heads and pistons. (I think I'll go for the heads and pistons for the lack of lag and the durability and long life of the hp).

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Old 11-17-2001, 05:36 PM   #10
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Jeremy, BSFC says that Im unlikely to make 200 @ the flywheel without having the injectors go full open. (bad) Id love to find out what Im getting on the dyno. I just got a midpipe made today (2.25) and with the cams it made a noticable difference.

check out http://www.i-club.com/forums/showthr...highlight=bsfc
for a more involved discussion on the whol 200hp na thing.

Once the injectors go static(100% duty) you can get anywhere from 235-212hp (bsfc of .45-.50 the normal range for NA motors)

85% (about max before going static) at .45 BSFC (best case) you can get 200hp out of the stock system.

BSFC calc
http://www.rceng.com/technical.htm#WORKSHEET

stock 280cc
fuel pressue 43psi
normal range for a na motor .45-.50
have fun
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Old 11-17-2001, 05:43 PM   #11
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There is no lag on an EJ25 turbo with stock compression. It is also quite durable, assuming you tune it properly.


Ben

Edit: By no lag, I mean that using a properly sized turbo on an EJ25 you get the advantage of the nice displacement and high compression when you are off boost, so any (minor) lag from the turbo is covered by the inherent torque of the motor.
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Old 11-17-2001, 06:32 PM   #12
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no no no....K&N filters don't add anything near 20 HP. I dropped one in my MY97 Legacy GT 2.5. with the stock paper filter, i was redlining 2nd at about 61-62 MPH. With the K&N, I'm redlining at 65-66 MPH....no where near 20 HP there....maybe 4 or 5
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Old 11-17-2001, 07:18 PM   #13
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For $500, I'd get a 50 shot of nitrous. That is the cheapest way to go fast, and 50 shot shouldnt be too harmful for the engine. Of course you should get an A/F and EGT gauge just to know what's going on inside your engine.

Danny
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Old 11-17-2001, 08:33 PM   #14
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Quote:
Originally posted by closure
Keiho, it is a DOHC so that puts him at $799 for the cams. If he had a budget of $800 I would have said cams too.

edit: Sorry, just realized that you probably meant for how he would get to 200hp. All apologies.
You were bang on in your deductions closure. I didn't take into account that he said MY98. But umm yea, I meant that cams will get an RS to 200hp. Yea...
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Old 11-17-2001, 08:39 PM   #15
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Default hmm.....this is how I see it.......

You can definately get to 200 hp, while staying NA.
It will take some money, though.
here is my list that would get your 2.5rs upto 200 hp:

1. Cold air intake (cobb intake)
2. Throttle body by Cobb tuning
3. Headers, preferably ceramic coated & equal length.
4. hi-flow catalytic convertor
5. hi-flow cat-back exhaust (brullen, stromung, Apexi, etc....)
6. N1 pulley set
7. Cobb tuning cams
8. Scoobyracing Chip or SAFC & ITC
9. ACT clutch & lightweight flywheel
10. Ignition, spark plugs, & spark plug wires......
11. Fuel regulator, fuel pump, & fuel filter.......


ok, now after all of that get an A/F ratio gauge and go dyno tune the car. It is alot, but I have no doubt in my little mind that that car could be over 200 horsepower with those mods and the proper tuning.

with all of that and some weight reduction, you would probably be runnning low 14's. i'm geussing?

you could also probably add port n' polish to the intake manifold.
I heard that UOR is coming out with cam gears, not sure when though.

am I close?

tell me whadya thinkin?
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Old 11-18-2001, 11:43 AM   #16
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200hp for $500....I dont thik so. Then again wait a minute isn't that Tornado thing good for about 50hp.


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Old 11-18-2001, 07:44 PM   #17
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i'd say save that $500 and get some Cobb stuff!!!

scubaracer listed pretty much most of what you'll need to get 200hp


FuJi

Last edited by FuJi K; 11-18-2001 at 08:41 PM.
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Old 11-18-2001, 08:06 PM   #18
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Yeah, Cobb's CAI is $269. That leaves you with $231 left over to buy around 20 more horsepower. Good luck!

--
Richard
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Old 11-19-2001, 05:36 PM   #19
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Thanks again, I will definitly check out the CAI's. One more question, are there any good chips that i could get out there that will help me with my 200hp goal?
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Old 11-19-2001, 06:06 PM   #20
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Quote:
Originally posted by 97legacygt
no no no....K&N filters don't add anything near 20 HP. I dropped one in my MY97 Legacy GT 2.5. with the stock paper filter, i was redlining 2nd at about 61-62 MPH. With the K&N, I'm redlining at 65-66 MPH....no where near 20 HP there....maybe 4 or 5

HOw did an air Filter increase your redline? Did you change your gearing while you were in there too?


-Kevin
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Old 11-19-2001, 06:09 PM   #21
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it won't change the redline, but what he's probably noticing is the needles momentum carrying them higher than they used to because of the slight increase in accelleration... remember, the guages can be up to 5% off I believe...
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Old 11-19-2001, 07:07 PM   #22
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either that or the meant it was sarcastic
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Old 11-19-2001, 07:43 PM   #23
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Quote:
Originally posted by 97legacygt
no where near 20 HP there....maybe 4 or 5

the little , was after he said it adds 4-5hp, not 20, so nothing do do with his previous statement of higher redline which he clearly meant that he thinks it actually did increase his redline(now who's rolling their eyes.....ahem), i know the speedo might be off, but being that the only thing he changed was to a K&N, then hopping back in the car and watch the redline climb higher=NO.
yes, it will possibly give you faster acceleration, but unless he changed the diameter of his tires or gear ratio's, then no, his redline would be the same as b4 he changed the simple filter


-Kevin
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Old 11-19-2001, 07:50 PM   #24
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Changing your tires won't change your redline, it will change the RPMs required for a given speed, which is probably what you meant.
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Old 11-19-2001, 07:57 PM   #25
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yes, thank you
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