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Old 11-23-2003, 07:02 PM   #1
quest
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Default upgrades for an 02 RS

ok...so I've gone through every thread I can find on parts and upgrades, to see what the best options are for the most performance at a reasonable price.

I was just wondering what kind of hp gains I could expect from the following additions (to a stock 02 RS)?

-Cobb CAI
-Brullen headerback
-perrin pulleys
-exedy lightweight flywheel

I was guessing around 5 for the CAI, 20 for the Brullen, another 10 or so for the pulleys, and 5 for the flywheel.

If anyone has any better ideas, feel free to post em too.

Thanks!
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Old 11-23-2003, 07:12 PM   #2
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if i understand it correctly...the pulleys and fly wheel wont add hp but free up hp
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Old 11-23-2003, 10:20 PM   #3
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Quote:
Originally posted by Brad Pittiful
if i understand it correctly...the pulleys and fly wheel wont add hp but free up hp
your right, less rotational mass to suck away at the hp being made in the engine, same as gettin lighter wheels/tires
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Old 11-23-2003, 10:35 PM   #4
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i'd say your right about everything but the pulleys, pulleys are good for about 4 whp it seems, so maybe 10 between the pulley's and flywheel

but remember, your mods just don't add up on each other, the intake will help up high, but you'll have small loses down low, and the pulley/flywheel combo will have more benefit down low
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Old 11-24-2003, 01:41 AM   #5
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On a "brake dyno" the pulleys and flywheel wont give you as much as is theoretical. You should get performance gains equal to adding 2.7hp per 1lb lost from the crank, so dropping 4lbs off the crank pulley would be 10.8hp but it shows up on the dyno as 4hp.

Gtech testing by iON Performance shows the RS drops to 14.9 qtr mile and 6.9 sec 0-60 with cold air fender intake, pulleys and Brullen headerback - normally high 7's and high 15's. I would guess that would be about 30-35 fly hp to get that much gains. My Brullen distrubuter tells me claims 20-21hp from the headerback system, and we've seen as much as 9hp on a road dyno with the GanzFlow intake.
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Old 11-24-2003, 01:52 AM   #6
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Sounds like a good setup to me.
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Old 11-24-2003, 02:33 AM   #7
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Perfect! Thanks everybody! That definitely helps.

These parts actually sound like a good mix, because the gains from one will make up for the losses from others (if I understand how this all works correctly).
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Old 11-24-2003, 08:58 AM   #8
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a big for 02 rs threads!

i would say you are definately on the right track. Im not sure about adding up the horsepower numbers because i have never had my car dynod and i am simply not shooting for high horsepower numbers. My goal was to improve on an already nice car. I think i have done just that. Your car will not be "fast" with all these mods unless you get into a serious NA build or turbocharge it. However you will have a quick, fun car and notice a very nice improvement over stock.
with that said,

I have the Cobb CAI, Borla Headers( i believe you will see greater gains with your full brullen setup), stock cats, custom unresonated 2.25 midpipe, scoobysport axleback. GFB Pulleys, Exedy LW flywheel and exedy sport clutch. (You should do the clutch aswell if you are in there doing the flywheel, might as well not pay the labor twice.) SAFC2(not Tuned) ITC (in shipping).

The car is clearly quicker than it was stock, and it is much more fun to drive but it is no monster!
I threw in a bpm short throw shifter and a momo jet steering wheel and driver imputs feel great!

dont forget to focus on suspension mods aswell! i have eibach springs, cusco rear swaybar, cusco front and rear strut bars, toyo 225 fz4 tires. (The FZ4's did not grip as well as i thought they would in the wet, however they are much better than stock). Overall I am very happy with this setup.

goodluck
Pat

Last edited by Pat L.I.; 11-24-2003 at 09:04 AM.
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Old 11-24-2003, 11:53 AM   #9
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Yes, I am definitley going to get a new rear swaybar, but I'll probably leave out the springs and struts. I don't want it to be too stiff, and prefer the extra clearance of the stock springs. If I ever get a set of 17s, I'd definitely lower it, but I'm happy with it looking stock (or stockish at least) for now.
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Old 11-24-2003, 01:00 PM   #10
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Hey Pat L.I.

were did you get your borla headers and also how $ di you pay for them?

Also how do they sound?

I am thinking of going for the borla headers to 2.5 in borla piping and high flow borla cat to a greddy cat back?
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Old 11-24-2003, 01:53 PM   #11
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I got my borlas from my dealership. Metric Subaru. they have a performance shop there. i believe i paid about 230 for them.

when i first had them on i was not too thrilled because i felt a loss in power and had a horrible in cabin rumble. a different rumble than i expected!! if you come across any of my old posts about them, i almost sold them!

within a week or two the sound changed and it sounded so much better. I also started to feel a power increase. I guess they needed to break in or something? i dont know! But i love them now, and i am glad i held on to them. They sound increadible combined with a scoobysport. Makes the 2.5 sound like a wrx with a turbo back exhaust. each exhaust pulse is much more spaced out than they were before the headers.

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Old 11-24-2003, 04:25 PM   #12
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I have a catback custom exhaust with magnaflow muffler and I just installed the Cobb Cold Air Intake yesterday. I love the sound and feel of the car now and I would definitly recommend those.

As per advise given to me though, I would definitly consider investing in new tires if you are riding on RE92's like I currently am. That will most likely be my next investement as well.

- MilleniX
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Old 11-24-2003, 04:43 PM   #13
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Get a stiffer front sway bar, then under throttle ur car acts like a fwd car so you can throw the back end around for faster turns. There's only one that I know of that fits our cars
Quote:
Originally posted by Swano
Whiteline have a solution for you guys.
Whiteline # BSF10
It's a 22mm front bar for the RS sedan.
They also have a 22mm for TS wagon BSF11.
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Old 11-24-2003, 05:14 PM   #14
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other way around i believe... get a stiffer rear sway to get the rear end out- more oversteer.

a front swaybar will promote understeer. Add in an adjustable rear swaybar and it allows you to dial in more oversteer again.

i think that would be a nice setup, and may be my next purchase.
I currently have my cusco rear sway on the middle setting, and i have nice controllable oversteer. If i get the whiteline front bar and bump my rear bar up to the stiffest setting. i should still be able to have a nice oversteer biased setup, while getting rid of what little body roll remains.

I havent heard anything about anyone using the whiteline bar though. Its fairly new and there arent any other front swaybars that will fit our cars. anyone have any other info on it?
hmmmmm-guinie pig
Pat

Last edited by Pat L.I.; 11-24-2003 at 09:29 PM.
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Old 11-24-2003, 10:15 PM   #15
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An inexpensive FHI 20mm rear sway bar and sticky tires will do wonders for the car - an expensive adjustable rear sway bar can be avoided to save $80.
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Old 11-24-2003, 10:15 PM   #16
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either me or u pat, we'll see who gets one first
I have the perrin adjustable rear sway and I'm lookin at gettin the Whiteline soon

the front sway bar makes it more of a fwd car because that is where our cars have the traction problem, having a stiffer front sway keeps the wheels on the ground
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Old 11-24-2003, 11:13 PM   #17
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our fronts have the traction problem because all the corning power is pushed straight to the tires with an already substantial 19mm sway bar, the rear with its anemic 13mm bar and plastic links folds like oragami under corning force

example, tonight in some slush, front end slides a little on a corner, back end sticks like glue why? cause no force was put on the back tires, the back end didn't come around at all, i could feel the car start to turn, but it just didn't go
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Old 11-25-2003, 12:43 AM   #18
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Quote:
Originally posted by ImprezaRS dot com
An inexpensive FHI 20mm rear sway bar and sticky tires will do wonders for the car - an expensive adjustable rear sway bar can be avoided to save $80.
very true, i was just commenting on the the ability to add oversteer back in once you neutralized it with a stiffer front bar.


blackandblue - be sure to make a post about it if you get it soon. i would like to hear your impressions.

the board ate my last post!!
Pat
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Old 11-25-2003, 02:53 AM   #19
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Here is oversteer with just RE730 tires and 20mm FHI sway bar for $100 or so, with stock suspension. And the car still finished 2nd Place Rookie in the state out of 126 Rookies, with just intake and catback to go with it

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Old 11-25-2003, 04:47 AM   #20
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w00t! A 2002-2003 RS thread!!!

I'm currnetly on H&R springs but want something with more of a drop. JDM STi 22mm RSB but I'm looking for some good Kartboy/strong endlinks. Had Whiteline Front/Rear strut bar but sold em...didnt' feel much of a difference. I have an Apex'i N1 catback exhaust off a GC, Minnam (ganzflow like) intake w/ greddy filter. I've been thinking about the borla headers but I'm not sure what the difference betwene the version1 and 2 were. Nonetheless, lightened flywheel and pulleys have crossed my mind. But how hard is install of the flywheel or how much shuold I expect to pay?

Good thread!



Let the 2.5RS' rejoice!
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Old 11-25-2003, 06:41 AM   #21
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My recommendation to you Is look into do-luck parts They have Loads of add ons From I/C's to Underbody braces......
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Old 11-25-2003, 06:42 AM   #22
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Here's a Link Sorry I forgot this Hope this helps you out it takes some time to find the Us Site off this one but you can do it......

http://www.do-luck.com/index.html
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Old 11-25-2003, 11:34 AM   #23
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thats all my 02RS (opinion) upgrade -
Engine bay:
AEM short ram (22-470) DIY mod with Apexi Air Filter.
WRX OEM front air dust.
HKS Circle Earth System.
GFB pulley kit.
STi engine mounts.
STi Transmission mount.
NGK Iridium IX spark plugs.
STi Radiator Cap.

Suspension:
H&R Springs (54456) F -1.5", R -1.4".
STi V7 shocks.
STi rear strut bar.
Cusco Type OS front strut bar.

Wheel/Tires:
FN01R-C + 215/45/17 Sumitomo HTR Z II

Exterior:
OEM front lips + side skirts replica.
Zreo/sports front grill.
Zero/sports Spoiler.
Zero/sports CF side air dusts.
WRX CF hood w/ scoop.
Raybrig twin fog/sport lamps. (for bad weather)
looking forward to have OEM rear lip set.

Exhaust:
Custom-build catback with 3.5" muffler.
looking forward to change either 5Zigen or Tanabe catback, still researching on them.

my RS is fun to drive, just good and enough for my driving style.

Last edited by windfactory; 11-25-2003 at 11:47 AM.
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Old 12-09-2003, 04:31 PM   #24
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I'm looking into getting headers for my car, but don't want that loud @$$ rumble in my car. Is there a particular brand I should get if I don't want it too loud? Between Borla and Brullen, which is less loud? Thanks guys.
BTW: I only have a cobb cai on my car for now.
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Old 12-09-2003, 06:05 PM   #25
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have you look at Cobb new header?
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