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Old 05-14-2001, 10:26 AM   #1
RaceCarRiot
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Post 1.8 mods...

as soon as i get my 90K service, it'll be mod time

i'm shooting for around 140hp...how much more will the usual bolt ons net me? i'm probably going to start on the intake/exhaust route...who makes a decent intake? the only one i've seen is weaponR...but i kind of have my doubts about their products. call me crazy, but most of the cars i've seen that are "tuned by weaponR" have those nice high performance stickers and pedals.

as far as exhaust goes, i was thinking about a tanabe racing medallion since they sound really nice on a flat 4. any ideas what that'll give me to start with...i'm guessing 10-15hp?

i dunno...any other ideas? just trying to turn my new (well, it's newer than anything else i've owned by 20 years) humble little car into the commuter from hell...

(adam)
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Old 05-14-2001, 10:49 AM   #2
oldpreza
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i think you are looking at turbo-charging for 140 hp. Plus a lot of decals.
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Old 05-14-2001, 11:00 AM   #3
Kevin Thomas
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110hp/110lbs of torque stock to 140hp. *Twiddling thumbs*

Get these:
Do you have AWD or FWD? I think the pulley mod will have the most noticable affect all around, especially in the lighter FWD. If you have the same weight pulley as the 2.2 and 2.5ltr in your 1.8ltr engine, ridding it of turning that pulley should make that car noticably (seat of the pants) quicker. Do the pulley mod first if you can.

Also, call Cobb Tuning to see if your compression can be up'd slightly. I would hope that you would have gained 20-25hp by then. Being optimistic, 26-34hp. Good luck!




[This message has been edited by Kevin Thomas (edited May 14, 2001).]
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Old 05-14-2001, 11:36 AM   #4
ins8ibl
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ok, I also have a 1.8 L. I don't think you will get anything but a sound increase out of changing the exhaust, because it is the same as the 165hp RS exhaust. Although maybe a RS muffler would help. There is no economical way to make much power out of the 1.8. If your shooting for 140hp just get a 2.2 liter engine. Or get a 2.5 liter, there were 2 for sale for $500 each in the classifieds here. A 2.5 liter will make more power than a 1.8 with thousands in mods.
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Old 05-14-2001, 12:17 PM   #5
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if you can actually get it, the JC sports intake is a dierct bolt on, you can also use the 2000 or newer style tube intakes....A friend of mine has a 1.8 AWD L wagon, with a 2 1/4 cat back exhaust, K&N cone on the end of the stock intake tract and it makes a racket, but its pretty quick too... Combine an intake, exhaust, pulleys and something like an SAFC or a JCS Torque chip (yet again, if you can get anything from them) and you'll be happy. Swap in some good new plugs, throw an oil cooler on it and figure out someway to duct cold air to the intake....
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Old 05-14-2001, 04:50 PM   #6
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Save up and go Turbo, with a 1.8l you have more turbo options, you can steal some Honda and Nissan parts to piece together a turbo.
I have a 2.2l and I can't get it over 150 HP, and it's pissing me off.
So save up, or just wait til' 2003 and get a WRX-STi (276 HP turbo) DROOOOOOOOOOL.....
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Old 05-14-2001, 04:55 PM   #7
BrysImpreza
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If you're looking for intakes for the pre-2000 Impreza check out a JCSports http://www.jcsportsinc.com
Weapon-R is ok, nothing too special.
Cobb tuning makes one, kinda pricey though.
For a the least amount of cash, do a Kartboy MAF Filter Mount and a cone filter. I liked mine alot, but went to an intake thinking it would be better... I ended up just getting louder and losing alot of my low end power, already sold the Kartboy, so now I'm stuck.

As for exhaust I just bought an Arospeed dual tipped Stainless muffler for $99.95 on sale. I'm putting my piping to 2.25"

The Pulley is next after that, Unorthodox makes one, but you have to change the belts for it.
JCSports makes one "N1" type, you can use stock belts with it.
That's all I got for ya...
Good luck
Bry
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Old 05-14-2001, 07:15 PM   #8
AudioFan
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I have a 1.6 L, and I already installed kartboy short shifter, shifter bushings, ganzflow CAI with k&n filter, Planning to buy Jc sport N1 aluminum pulley (same size but lighter, my stereo wouln't like a smaller one) and stromung for the moment, then suspension, rear sway bar, etc.


hope it helps

You can see it at sounddomain.com look for impreza, then DIY kenwood....1998...etc.

[This message has been edited by AudioFan (edited May 14, 2001).]
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Old 05-15-2001, 01:12 AM   #9
RaceCarRiot
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Unhappy

wow...i didn't think getting 30hp would be THAT tough. i didn't realize the 1.8 was that unresponsive to mods...i figured if honda guys can find an extra 20-30 (flywheel of course) pretty easily in the SOHC 1.6...ah well. i'm looking to just make it quicker...i really can't complain about it stock for an "economy" engine, as it really does have quite a bit of pull once it's rolling.

so if 140 is completely out of the question, what can i realisitcally expect?

[This message has been edited by RaceCarRiot (edited May 14, 2001).]
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Old 05-15-2001, 11:00 AM   #10
RaceCarRiot
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stupid question, but how do racing pulleys work on liquid cooled engines? my only real experience with them is on aircooled flat 4's, and the smaller diameter basically reduces drag on the engine by making the engine fan turn slower (thereby giving you more power)...the only problem is the fan is an aircooled engine's only line of defense, so they're not something you really want to try for street use, especially here in FL.

although i remember the time my fan broke, netting my about 30 more hp, hehehe... of course then the oil cooler blew several days later...

i'm guessing by AudioFan's response, it has more to do with the alternator (?)
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Old 05-15-2001, 12:47 PM   #11
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Same thing as air cooled, it slows the accessories down which reduces drag, also since they are lighter it requires less force to turn them...less rotational inertia..
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Old 05-16-2001, 12:55 AM   #12
Greg Sharpe
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An RS exhaust is bigger than our 1.8L exhausts, and they're cheap too! You may also be able to swap in some new cats from an RS too, as they will also have a larger inlet/outlet size. Luckily, the 1.8L has dual exhaust ports, unlike the 2.2L NA engine. If you've got the money, an ITC can work wonders on NA engines, and combined with that low-comp head gasket from Cobb, you may be on to something!

Personally, I'm just waiting it out and not going to mod my 1.8L engine until I can get an imported turbo engine, or decide to build something from a domestic engine (2.2 or 2.5). A northeast 1.8L owner whooped on a few RS owners at an icerace this winter! These engines do have a use.
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Old 05-16-2001, 01:15 AM   #13
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Dont run a straight through muffler on a 1.8 I wouldnt run one on a 2.5 without turbo that will actually hurt more than help.

Pulleys and headgasket to bump compression would be real good run a lower profile tire to help acceleration.
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Old 05-16-2001, 09:37 AM   #14
RaceCarRiot
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so basically with the pulley, i'll be OK as long as i don't put a monster stereo in the car, right? i just don't want my headlights dimming everytime i hit the brakes, etc...

i'm looking at a kartboy MAF, but what "added hardware" do i need to install it, and which filter works the best?
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Old 05-16-2001, 11:48 AM   #15
oldpreza
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i believe the RS exhaust is exactly the same as the L exhaust other than the much bigger and more cosmetic exit tip. Saw it in previous threads. Correct me if i'm wrong.

EDIT: BTW, where to find the Cobb low-comp gaskets?

EDIT2: I think you'll only need the MAF adapter, a cone filter with the 3" diameter, and some support to hold the "hanging" filter cone. Some people recomended Pipercross foam filters as they don't need to be oiled.

[This message has been edited by oldpreza (edited May 16, 2001).]
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Old 05-16-2001, 02:53 PM   #16
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I also have a 1.8L, it's a FWD model. I figure nothing short of a turbo will give my car any noticeable power or speed. I'm not looking to spend hundreds of dollars for like 10-20HP. I'd be happy to get up to 200HP with a turbo,of course. Turbo or an engine swap, nothing else seems like it's even worth the money.

Kevin Thomas - my car gets really bogged down when I have the AC on. Wouldn't a lighter pulley absolutely kill the car while driving with the AC on?
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Old 05-16-2001, 06:07 PM   #17
RaceCarRiot
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DoinkMobb-- i know whatcha mean about the a/c...just don't drive with it on around town (of course that's easy for me to say seeing as how i've never owned a car with a/c until now). i tried, but the erratic clicking on and off of the compressor proved to be too annoying/whiplash inducing. i just save it for the highway.

with the 5 speed and the a/c off, the 1.8 is really pretty strong for such a tiny engine. i guess it's kind of like the VW 8V vs 16V engine war. almost everyone swears by the 16V (until it's time to take it to the shop, heheh), but i've seen quite a few downright nasty 8V engines that'll embarass all but the most heavily modded VR6's...and supposedly much like the 1.8, "you can't get any power out of a 2.slow"...

keep in mind too, Mobb, that the FWD 5-speed cars only weigh in around 2300lb...on par with the MKI MR-2 i almost bought...the desire to carry more than a change of underwear and a toothbrush if neccessary got the best of me.

oldpreza--thanks...i just wanted to make sure there wasn't some kind of widget/whatever i had to buy separately or something since kartboy.com didn't specify.
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Old 05-16-2001, 09:34 PM   #18
Kevin Thomas
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"Kevin Thomas - my car gets really bogged down when I have the AC on. Wouldn't a lighter pulley absolutely kill the car while driving with the AC on?"

DoinkMobb, I wish I could answer this question. Fortunately, I can cruise now with the A/C on full blast and still be thrusted into my seat. I can't remember how it used to be before the turbo kit. All I remember is a lot of painful butt-kickings being delivered to me....A/C or not.

Your A/C would probably not be as powerful as with your stock pulley but your ride certainly would not suffer. As a matter of fact, your acceleration should be faster with the racing pulley installed. You'd certainly have more power available to accelerate the car.
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Old 05-17-2001, 12:16 AM   #19
Greg Sharpe
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I can vouch for the difference between the exhaust size of a 96 1.8L AWD L and a 00 RS, the RS exhaust is definitely bigger. I'd say 1/8"-1/4" difference, just a guess without calipers handy.
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Old 05-17-2001, 12:37 AM   #20
DoinkMobb
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So the racing pulley would free up power for acceleration while draining power from the electrical systems? So that would mean dimming headlights when I had the stereo on at the same time?
Hmmm...better acceleration vs. less powerful AC and possible worse gas mileage.
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Old 05-17-2001, 06:00 AM   #21
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That's why the make a pulley that is the same size, but lighter, the result will be better acceleration and no side effects on a/c or alternator, dimming lights, etc. this is what I have been told.
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Old 05-17-2001, 08:21 AM   #22
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StiShawn, I hope you weren't referring to me? My car isn't that loud is it? I guess that's what happens when you throw a 2.5" pipe on it...

My 1.8 has the custom K&N, exhuast, Underdrive pulleys, blazeblah.. But it's definitely quicker than a stock 1.8! Still slow though

There's not much you can do. I'm looking at that $500 2.5L shortblock.. In fact, I just got of the phone with Rallispec and talked with them about their WRX conversions... didn't know it was going to cost $12K though..
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Old 05-17-2001, 09:13 PM   #23
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I also have a 1.8. I was wondering if any of us fellow 1.8 owners were to swap in a ej22 or ej25 would we have to convert it to awd or could we keep it that way? what about upgrading the transmission?(i know it would be better, but just wondering)
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Old 05-18-2001, 12:48 AM   #24
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tripl3s3v3n - you have a FWD Impreza too? I thought I was the only one.

An engine swap would be nice. Something bigger than a 1.8L to work with would make modding much easier. How high could a 1.8 be turbo'd before you'd be putting serious stress on the engine and tranny though? I'm not looking for ultra quick 0-60 times or 1/4 mile times, I want the car to be fun to drive.
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Old 05-18-2001, 01:16 AM   #25
redobs
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OK, here's my take on it, since I've looked for every conceivable mod for my 1.8L. There's no way your going from 110 to 140 without some serious mods or an engine swap.

Most noticeable mod will be the underdrive pulley. But, you have to do this in conjunction with at least an intake. I have a K&N cone filter and UD pulley, that's it. If you can get your hands on a whole intake like JC Sports', go for it. I was in the process of getting a Minnam intake tube from another member, but since that member was waiting for his JC Sports turbo kit, I still don't have it.

As far as exhaust, don't waste your money on Tanabe RM. It wouldn't fit anyway. Get a used stromung or something else from a member who is going the turbo route. Then get a custom midpipe done at a muffler shop. I wouldn't go over 2". You're gonna lose low end. As you said you want to make it quicker, and that it goes once it gets going. If you go over 2", it's gonna reduce your low end and take you longer to get it up to speed.

As far as the RS exhaust, it is the same exact muffler, but different tip. I've had them lined up, and they are exactly the same. The midpipe is different though. SO, it is possible for that to be bigger.

Something else that can be done is port and polish the heads. The 1.8 has thicker walls, so you are able to remove some of that.

As far as the pulley goes, it dims the lights when you are ideling, say at a light. Once you get the revs up, it runs normally.

To me a turboing it wasn't worth it. My engine has 119K on it, plus turboing a 1.8 would make it equivalent to an RS (at say 5 psi). I felt if I was gonna go turbo, I wanted to go faster than that.

Since the 1.8 isn't really a fast straight line car, you can make it fast in other ways. Suspension is one. I also have Eibach springs, whiteline bar, Cusco rear strut tower bar, and 16" RS rims with Dunlop SP 5000's on it. I race in STS, and this past weekend I almost beat a modded RS. I would've my last run, if I wasn't trying so hard and spun it.

BTW, the way I've made my 1.8 faster by more than 30 hp is I just bought a WRX. My 1.8 is for sale if anyone wants it.

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