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Old 06-28-2001, 02:39 AM   #1
IBO
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Question How far can you take Impreza on N/A basis?

I've just got a MY02 2.5RS about a month ago. I am planning to save A LOT of money to modify it. I know there are quite a few turbos out there, but so far from what I know, Cobb Tuning is the only one that does N/A tunning on Impreza.

I know by getting turbo I can get a bigger gain of HP, but turbo engines are always harder to manage. So, from Cobbing Tunning website, it looks like I can only get about 2??HP at stage 3.

It would be really good if you guys would give me some ideas, like which mod should I go for, turbo? or N/A tune??

PS: Don't ask me why I didn't get WRX, because my parents think it looks ugly with the scooped hood...
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Old 06-28-2001, 03:56 PM   #2
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This is strictly your choice; however, if you want to talk to someone with an extremely fast (actually the fastest Ive heard of) 2.5 RS N/A, ask andreasRS01. He has every N/A goodie from cobb tuning on his car...and then some! I have done exhaust, cobb cams, headers, intake and pulleys and I am extremely happy with the power I have, but a turbo will be my next investment after I make the money. The cams I have are the cobb cams and they work fine with a turbo if you decide to take that route, but they are designed to give you more hp on an N/A car. I left my options open for as long as possible before obligating myself to a particular path so I dont end up wasting money in the future. Give this a lot of thought before you dive into it. Hope this helps and good luck!
Dan Coty
PS: For N/A power, look at the cobb camshaft selection, there are the turbo cams (strictly turbo), the "spicey" cams (strictly for N/A) and the intermediate cams (swing both ways), which is what I have. If you really like having a unique setup, continue with the N/A route and save up for the cobb heads, throttle body and anything else that is fitting. Maybe valves and springs with a tec II to raise the redline to 7000-7500 to use all the high-end power the cams and heads will give you. It is an expensive route, but if the means are there, then go for it!

Last edited by dcoty; 06-28-2001 at 04:01 PM.
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Old 06-28-2001, 04:11 PM   #3
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Default Re: How far can you take Impreza on N/A basis?

Quote:
Originally posted by IBO
PS: Don't ask me why I didn't get WRX, because my parents think it looks ugly with the scooped hood...
You let your parents pick your cars for you?? The WRX looks bad ass, and you know it so why you let yer parents push you around like that?
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Old 06-28-2001, 05:15 PM   #4
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omfg! IBO, that's one of the biggest reason why i didn't (or rather, couldn't) get the WRX. my mom hated that hood scoop.

well, in my case, my parents could cuz they were the ones buying it. i'm lucky enough that they wanna buy me a car... nevermind 3/4 of the car that WRX offers, so they get to have some input too.

back onto the topic, just wondering, isn't the only way the RS gonna make more power is by having more power up top and raising the redline? in that case, how much low end are you sacrificing? a lot, or just a bit?

fwiw, i think i'll still get turbo when i start making some real money

[edit] btw, Clegg, so why did you get the RS??? join the scoopless clan!
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Old 06-28-2001, 05:56 PM   #5
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I bought the RS for a few reasons:

1. Bigger engine = Better low end torque.
2. can put a turbo on later on ( more versitle in the long run), also I saw there are super charging kits coming out in the coming year.
3. Insurance was UNGODDLY for the WRX for me.
4. I got the 2.5RS loaded with most all the goodies available for less then the cost of a stock stripped WRX
5. 4 + week wait on a WRX, 2 day wait on my 2.5RS.
6. If I wanted a scoop all I would do is have a dealership order a WRX Hood for me.


So thats about it... do I wish I had a WRX.. sure, but I am really starting to like the stuff I can do to the N/A engine, and over all I am super pleased with the car... I even have an Automatic in it ( I drive down town to work daily and a stick woulda sucked).

I have a nice long 60K exteneded warranty so I figure in 4 years I will be ready to re-do the drive train to some super charged, Manual Tranny, COBB Tuned beast. But for now its comfortable, torq'y, looks bad ass, and can still smoke most all Civics

I will be putting a Cold Air Induction on the car in a few weeks, and doing some other stuff that I can remove if I need to get warranty work done.
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Old 06-28-2001, 06:17 PM   #6
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Cool Automatic tranny?!?

Don't think that having a stick makes it more tiresome when driving to work. I have driven stick on everything i have owned. Believe me you don't even know you are shifting most of the time, just when you are smoking the hondas!!!

Rob
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Old 06-28-2001, 06:27 PM   #7
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hehehe I have drove stick before, and its just such a freaking hassle when you are dead asleep in the car going into work

Also I have a GPS in my car, and other toys I play with when going to work or going on road trips , I dont need one arm always in use shifting.

Some people love stick, some dont, I just happen to not like it. Give me a Sport stick auto anyday, then I can shift when I want and put it in auto the rest of the time
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Old 06-28-2001, 06:49 PM   #8
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I thought about an auto with Chicago traffic, but today I was leaving Chicago, eating a Big Mac and shifting all just fine. You really don't notice it. I was half was home when I finished my sandwich and realized that it hadn't been a hassle at all. Glad I went the way I did, but to each his/her own
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Old 06-28-2001, 09:01 PM   #9
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Dcoty: Thanks for the reply, that really helped me a lot, but I've just got a few questions... What else do you have on your car?? So far, I have only bored my throttle body, and I am putting a PDM or PRM(Undecided) intake within the next 2 weeks. I guess, from what you wrote, Cobb cam seemed to be a good choice. What else do you recommand? And how much HP do you have after the mods that you have done?

Sunny: Yeah, my mom thought that the WRX is too aggresive looking(Yeah right, look at the previous model...), so I had to go for the 2.5RS. On the other hand, I do agree with Clegg though, I think 2.5RS can be more versitle, and I think(If i am not wrong) a turboed 2.5RS might be more scary then the WRX due to the larger displacement.
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Old 06-28-2001, 09:23 PM   #10
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It will deffinitely pack more punch at the low end. if you look at what some people have done with the EJ25 engine. They got the power curve to peak at 240Hp with a Turbo at around 5000 RPM.. where the WRX needs to get to around 6000 RPM to hit 227

But at 6000RPM the 2.5 was down to like 210HP or something.. there was a drop off at that point, prolly cause of Fuel flow or Air flow restrictions. ( I am not a car guy... this impreza is slowly turning me into one... but from what I have read Air/Fuel flow's at those high of RPM's on the EJ25 seem to be critical.)

I want my 2.5 RS to look stock from the ouside ( minus the exaust,and slightly lowered springs ( .50" at the most... we get snow here).) That way when a Civic bitch, or a cocky WRX'r ( there are a few around this area it seems) want to give me a run, I can smoke em

Unfortunately in the end it will cost WAY more then a WRX would, but its something I did on my own so thats another plus. ( if you are familiar with the geek phrase - Overclocking for CPU's in computers... the 2.5RS is a GREAT overclocker
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Old 06-28-2001, 09:54 PM   #11
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hahah "overclocking" my ej25!!! give it more punch per cycle!
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Old 06-28-2001, 10:02 PM   #12
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I am a hard core geek.. hell I water cool computers and run the biggest site on the web for it ( www.procooling.com ) and thats the best term I could come up with to explain to a friend why I bought a 2.5RS
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Old 06-29-2001, 03:28 AM   #13
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Clegg: hey, watch it. the porsche crowd might get you for water cooling your cpu . anyways, my cpu is overheating constantly. maybe i *should* watercool it eh?

on the manual/auto issue, i'm a stick newbie, but for the most part i don't find it too bad. fwiw, i took the wrong bridge and ended up going thru downtown traffic on the first day i got my car. that said, i do find auto much easier to drive when you're dealing with mom in the back seat.

now for RS-T losing power at 6000, wouldn't Cobb's cam help quite a bit? i read somewhere on this board that the Cobb cam can raise the redline to 7200? with the TEC-II, it shouldn't be a problem should it? unless there's other restrictors...

i agree about the RS being more versatile. i never got a chance to TD the WRX, but apparently its not as torquey when your just tooling around. besides, there's not really anything on the rex that i can't get on the RS w/ a bit of aftermarket help (other than the leather steering wheel/shift knob. i'm still pissed that US RS gets those and i don't ). besides, nothing beats showing the big brother the 2.5RS badge on the trunk (ok, i'm getting carried away here).

that said, does any of you have problems with people coming up and said "hey, nice WRX there"? maybe i should make a big banner that says "NOT A WRX".

oh, jack, guess what? my mom hated the old style RS. i doubt there could've been a way that i can get that car unless it was dirt cheap, which at the time i got my car, it wasn't. lucky me
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Old 06-29-2001, 04:54 AM   #14
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Hehe, my mom likes the hoodscoops (She almost got a 2000 RS, but it was sold... so she got the Legacy GT :P)

Anyway, you guys might want to look into doing some suspension work too, cause the RS has some improvements it could use in that area too...
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Old 06-29-2001, 09:40 AM   #15
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hehehe, I was in a CompUSA and the geek who was ringing me up was like "Is that your WRX?" my reply was "Nope, better "

hehhehehe I got the kid to believe that the 2.5RS is the supperior car didnt meantion it's 50Hp less then the WRX hehehe
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Old 06-29-2001, 09:53 AM   #16
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Yeah, my gf's friend all think that I am driving a WRX, and every time I have to go tell them that it's not WRX... I mean, I don't even have a spoiler and fog lights.


-S-:

Quote:
oh, jack, guess what? my mom hated the old style RS. i doubt there could've been a way that i can get that car unless it was dirt cheap, which at the time i got my car, it wasn't. lucky me
Did you miss typed "hack" into "jack"? Because my name is Jack...
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Old 06-29-2001, 09:55 AM   #17
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my RS has the Fog lamps and the spoiler so it looks just like a WRX minus the hood scoop
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Old 06-29-2001, 09:59 AM   #18
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Ah... no wonder... Exterior mods would be the last midifications that I would do to it, I am spending all the money on the performance mods...

BTW, good morning.
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Old 06-29-2001, 10:08 AM   #19
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You can make the 2.5rs VERY fast w/o going with Forced Induction...
I have larrys intake, a custom made exhaust (2.25") and an apex'i N1 canister, along with an underdrive pulley. I have alot more mods, but that is all the 'speed' mods I have done so far...

Cobb pretty much says that the intake and exhaust put the rs to 185hp and 185ft-lb trq (look at the cobb version of the rs on their site). The UOR pulley adds I believe another 10-15hp to the flywheel...so now my car is around 195-200hp (I dont know what the whp rating is b/c there is no 4wd dyno near atlanta). Once you start looking at cams and heads for the 2.5rs from cobb, you get around 19hp from the mild cams and 30hp from the heads (thats at the wheels numbers)...close to 250hp at the flywheel..IMO you can smoke a wrx.

Down the line, I am getting the cobb intake and a larger midpipe for my exhaust....but I love the set up now. All I need now is my suspension and a new wing (ver VI).
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Old 06-29-2001, 10:56 AM   #20
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I think you may be exagerating a lil bit on how far you can take it with just N/A. I would say 220 - 230 but 250 seems a lil high.
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Old 06-29-2001, 11:14 AM   #21
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i would suggest a engine power package from cobb. i am saving over the summe rot buy the stage two kit. It says it will bump you up to about 200hp, after that i am saving for cams and heads. I want to match the hp of a wrx, then crush it, without going turbo.

clegg- cobb has proven you can get 250hp out of a N/A RS.... it will cost you about $4300 though...
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Old 06-29-2001, 04:30 PM   #22
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at a price of $4300, i'd rather boost it.

IBO: i know your name is Jack... i just didn't put cap on it. sorry

blindeye: you made one mistake in your calculation- you can't just add up the mod's HP and say that's your total HP. that said, i'm sure your RS is still pretty damn fast given the list of mods you've made.

how's the pulley btw?
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Old 06-29-2001, 06:45 PM   #23
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Quote:
you made one mistake in your calculation- you can't just add up the mod's HP and say that's your total HP. that said, i'm sure your RS is still pretty damn fast given the list of mods you've made.
I dont understand what youre saying...If a company gives a hp rating increase at the flywheel what diff would it make?

--and no I am not being an ass..

-justin
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Old 06-30-2001, 12:29 AM   #24
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no worries, i didn't think you're being an ass anyways

what i'm saying is, for example, you start w/ 160hp. if an intake gives you 10, catback gives another 10, it does not give you 180hp.
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Old 06-30-2001, 11:50 AM   #25
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Correct, they don't add up. Hell borla says you get an extra 30hp from their cat-back and headers. Whatever! The best I can do is compare my car to the cobb tuned model at 192hp and say it's about that. Trey's opinion is that with heads and cams tuned with a TecII it would be in the 220-230 range. That's enough power for me for now. Give me a few years and I'll have a 2.2l turbo EJ20 in there! Maybe I'll save up for a prodrive 6 speed tranny first
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