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Old 05-04-2002, 04:02 PM   #1
latinskllz
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Question GC8-2002 WRX turbo project downpipe question

I was searching on i-club for owners who have gone the turbo route on their gc8 for custom downpipe fabrication and came to none.

I will be acquiring the finishing parts for a complete 2002 WRX exhaust to slap onto my gc8 for my turbo project.

I was looking at the Scoobysport design on the downpipe, and noticed a very nice design on it. Having a cat, twin-dump type system appealed to me.

What i'm wondering is, you think it will be cost efficient if I get a high flow cat in the midpipe instead and just run a custom downpipe with a straight-thru design instead?

What I mean by straight thru is in the sense of getting a IHI downpipe flange to fit a IHI VF23 turbo and:

- make 2.5" exit piping for the turbo exit hole on the flange utilizing same bends as the stock WRX downpipe

- make a _?_" exit piping for the wastgate and have it merge up about a foot downstream into the downpipe.

Now for the rest of the exhaust, custom 2.5"midpipe with a high flow cat and o2 sensor bung welded before the cat? That can be my second placement of a 02 sensor.

These are just some ideas i'm throwing in the air for later when I upgrade my exhaust system.

You think it will be ok to use a IHI VF23 turbo with a Complete WRX exhaust system?

I do have a TEC-II, vishnu fuel rails awaiting install by the way, if it helps with your analysis on my custom exhaust set-up.

The very nature of this custom fabrication is not to spend much money vs. a full cat back exhaust for a WRX Application, downpipe and up-pipe.

To all that are wise in this area, please provide enlightening comments/suggestions.

Thank you,
Kevin
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Old 05-04-2002, 11:52 PM   #2
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you live in Florida.. there is no need for a cat.

you could go with venturi desing but I'm not sure what type of differense it will yield at lower boost levels. have you thought about venting to atmosphere...

I will be venting the wastegate to atmosphere but having my BOV go back to intake... I like the wierd noises

Brad
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Old 05-05-2002, 07:19 PM   #3
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Outback Motorsports has the flange that you need to make the downpipe(the one with two ports that bolts to the back of the turbo).

Chad makes a downpipe already if you want to save yourself some engineering. I just took my first ride in my RS with a 2002 WRX turbo in it. I used Chad's pipes so I didn't have to replace my crossmember with a turbo crossmember.

Good luck! John
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Old 05-05-2002, 11:25 PM   #4
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Quote:
Originally posted by Rovah
Outback Motorsports has the flange that you need to make the downpipe(the one with two ports that bolts to the back of the turbo).

Chad makes a downpipe already if you want to save yourself some engineering. I just took my first ride in my RS with a 2002 WRX turbo in it. I used Chad's pipes so I didn't have to replace my crossmember with a turbo crossmember.

Good luck! John
What is the link to Outback Motorsports?

Does Subachad make a matching up and downpipe?

Larry
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Old 05-06-2002, 03:02 AM   #5
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yes he does. but he does not add a flange to the bottom of the down pipe that will bolt up to stock pipes so you have to get an extra flange and take it to an exhaust shop... but hey for what it cost to get a flange welded on.. no biggie...

Brad
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Old 05-06-2002, 07:00 AM   #6
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Not sure of a link for outback, but they're registered here, so search and PM them. They've always been good about getting back to me, although they can be a bit hard to reach by phone. They just messaged me that they also have fuel rails with threaded ends for Subaru. Not sure of price.

Chad's pipes are nice. The up and down pipes are matching, but I had to do a little extra work to my up pipe because I have an auto tranny.

Cheers! John
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Old 05-06-2002, 09:40 AM   #7
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STITuner, I could add a flange to the bottom, but a 3bolt SS CNC flange will set you back $30... thing is you need 2, plus the gasket. I'm thinking about only selling the down pipes with the flanges and just bumping the price accordingly. Some people would rather not have a flange at the bottom though.

Do they match? That's a good question that a lot of people don't think about. Yes the two match. I'll sell the up pipe by itself, but the down pipe can only be sold if you have already bought an up pipe.

At any rate, I need to call Steve and order some down pipe flanges too, his number is 714-994-5222. They won't answer the phone "outback motorsports" since Steve uses someone elses shop. He's a good guy though, tricky to get a hold of, but he'll get out the parts quick.

Chad
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Old 05-06-2002, 06:31 PM   #8
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Arrow has anyone used subachads with their 2002 wrx intercooler

and stock turbo location to fit?

I'd like to use my 2002 wrx intercooler i have. I also have a IHI VF23 turbo that I will be using....so it is essential that the intercooler and turbo meet at their location.

I'm wondering if i could save myself 335 bucks from buying the crossmember and use that money to invest in a good downpipe and up-pipe.

Thanks,
Kevin
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Old 05-06-2002, 07:35 PM   #9
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Kevin,
I don't think that the stock WRX intercooler(2002)will fit in an RS. Not enough room between the intake and firewall from what I had read in the past. I know there had been some threads about this in the past if you want to do a search.

Of course, you could get a used JDM WRX intercooler and that will fit. Don't know about the plumbing between that and the turbo though. Anything you do will involve fabrication at some point, so be ready! :-)

Cheers! John
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Old 05-06-2002, 07:54 PM   #10
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Default bro, i have acknowledged this fact.

that i will have clearance issues....i'm ready to do some trimming.

i already have the intercooler so if anything, just get my custom exhaust done to mate with the turbo.

I just need ideas...i'm not so sure if i want a bolt on turbo kit with 2002 wrx exhaust components anymore right off the bat.

Thanks,
kevin
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Old 05-06-2002, 08:28 PM   #11
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the big problem with the way the stock pipes work IMO

is fabrication of the charged pipes and fabrication of the intake pipe. there is not a whole lot of room for the intake pipe where the stock WRX pipes sit since they are ment for the intake to run under the intake runners. that is simply not the easiest thing in the world to do on our cars

I believe from pics I've seen of chads pipes you have a bit more room to work with for your intake and you charged pipes.

Brad
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Old 05-06-2002, 09:37 PM   #12
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Kevin, the turbo-back WRX exhaust will fit, but it takes some work to fit it. If you are looking for a place to do fabrication and exhaust installs, I can recommend one. He does AWESOME work (just take a look at my car), but he costs money too.

Depending on what uppipe you use, I would/wouldn't recommend the WRX downpipe. I am using the Legacy uppipe, which sits the turbo quite high compared to other kits. My downpipe is STILL to low (about 1-1.5") and consequently I have a little sagging under the car, but nothing too bad.

A custom midpipe is an excellent idea, as the cat in the WRX midpipe doesn't like the configuration of the exhaust cut through routing under the car.

Graham
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Old 05-06-2002, 10:17 PM   #13
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I'm not sure I'd do it the way you originally planned either. After having recently installed my WRX turbo and parts, I'm very happy(much tuning to be done), but stuff doesn't just, "bolt up."

That's a running joke with my mechanic and I(although i did my turbo install with the help of a friend). He always says, "so this is another part that just bolts up!?" ;-)

I'd either go the way that Chad and I have done, do a Legacy conversion, or buy a kit that's been on someone's car. The luxury you have is that many people have done turbos in their RS in many different ways, and there is generally good documentation on the club and web.

Not sure if you've see the pics of my install, but here's the link. www.lastditchracing.net/imprezaturbo.html/

BTW, took a 10-15 mile ride tonight just to make sure nothing was going to break on my car, and the Saab intercooler I'm using wasn't even warm to the touch.

Best advice I can give is to check out all the options, analyze what you want out of the car, and then get ready to lay out some $$ and have your car out of commission for a few days...

Cheers! John
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Old 05-06-2002, 10:35 PM   #14
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can all of the IHI turbos and other WRX bolt on turbos be easily clocked or rotated?

what if I want to upgrape my turbo later I don't want to have to go out and have a new charged pipe when I upgrade.

Brad
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Old 05-06-2002, 11:08 PM   #15
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The issue with the stock IHI WRX turbo and rotating the housing is that you are unable to use the stock internal wastegate and have to go to an external unit.

The compressor housing of all turbos can be rotated. The stock turbo(and I imagine most) has a very large snap ring that you must remove to rotate the housing.

The flange on Chad's pipe will fit most IHI turbos(correct me if I'm wrong Chad), so upgrading to a different turbo later on shouldn't be a big deal. It may require some fitment(trimming intercooler pipe/intake pipe etc), but it shouldn't keep you from going that route down the road.

Cheers! John
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Old 05-07-2002, 08:56 AM   #16
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Johns right, the up pipe will fit just about any IHI turbo so long as it has the IHI style of inlet flange. You'll notice the obround hole in the flange that allows you to fit the old turbos and the new TD04's.

The down pipe flange is different, but if you can get a TD04 on there, then you should be able to upgrade to any of the WRX Turbo upgrades in the future.

Chad
93 1.8T
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Old 05-07-2002, 10:33 AM   #17
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Default I have a IHI VF23

And this is what I plan on sticking with for a long time. I did the research on this turbo, and it fits all my needs that I can see.

After really sitting down and thinking about it, I could substitute in buying the legacy turbo x-member (saving $330 bucks), and just get a custom downpipe/up-pipe made to place the VF23 closer to the stock location while utilizing the EJ25 headers.

I just don't think it's logical to install a VF23 with a stock wrx downpipe/up-pipe configuration anymore.

Graham, when the hell you gonna have some time so I can see your setup???

I could really use some up close and personal visual insight on finishing my project.

Keep the ideas coming guys
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Old 05-07-2002, 11:09 AM   #18
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I personally don't really like the clearence on grahams set up. granted it is a very clean instal and the performance is great. but just with where the turbo actually sits does not appeal to me. didn't you have to have a custom spacer made to go into your uppipe somewhere? perhaps if you fiddled with spacer sizes you might be able to get a better location.

Brad
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Old 05-07-2002, 11:45 AM   #19
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Default STiTuner...who the heck are you?

Have I seen you around orlando?
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Old 05-07-2002, 03:45 PM   #20
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I had theo short blonde in my car at the lil500 meet. I did the FATF turn into your lane right in front of you.. I have "THE HAT" that the SCSO deputy wore... I thought everyone in orlando knew me...

no everyone knows the hat though.

Brad
drives a silverthorn GC8
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Old 05-07-2002, 04:44 PM   #21
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Alright, if I could go back and do it again, I would buy Chad's up/down pipes. I personally don't like where my turbo sits (it is very high in the engine bay), though it does work. I do have a custom 20mm spacer between the exhaust manifold and the uppipe, and this is for reasons of head clearance. I could probably have a larger spacer made to put the turbo further back away from the intake manifold, but it works right now. I could also have a custom uppipe reconfigured, but this would then conflict with the charge pipe I had made and probably the custom intake pipe. For me, going to a VF-23 would be a job, as I would need to have an external wastegate put on (and this would probably mean having a new uppipe fabbed), charge pipe reconfigured to suit new turbo location, turbo intake pipe reconfigured, and maybe put on a new downpipe.

The Legacy kit is cool and all, but I have run into some avoidable problems with this setup. I have to put a new WRX front swaybar on to compensate for the new configurations of the Legacy Turbo crossmember. Also, the waterpump was changed, though this might have been able to be skipped, I'm not sure. Chad's up/down pipes just seem like hours of work could have been avoided, and going back to N/A would not be NEARLY as much work as it would be for me. Although, I am not sure how well Chad's pipes fit, and might take some work to do so, I don't know. All I can say is the Legacy setup took me tons more time than I expected, but I and Alan didn't really know what we were doing.


Graham
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Old 05-07-2002, 06:39 PM   #22
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FWIW, Chad's pipes saved me a lot of time, although I did end of modifying the up-pipe(I have an auto tranny and the pipes were designed on a standard tranny).

With Chad making pipes that fit right the first time(almost in my case), it saved a lot of guesswork and local fabrication.

I'll echo Graham's comments that it takes a lot of time to put everything in. Then, factor tuning time and miscellaneous time, and time away from the project, etc.!

With Chad's pipes, the turbo sits in a perfect location. There's lots of other things to do, but pipes like this weren't available more than six months ago, so I feel pretty fortunate that I was delayed on assembling my kit.

Cheers! John
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Old 05-07-2002, 09:27 PM   #23
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Default So do chad's pipes utilize the EJ25 manifolds...

...or the ej20 manifolds and exhaust configuration?
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Old 05-07-2002, 10:24 PM   #24
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Chad's pipe utilize the stock manifolds. I'm using a Borla exhaust manifold with my pipes. No fitment issues whatsoever.

Cheers! John
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Old 08-19-2002, 01:52 AM   #25
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Bump

I have a two questions:

Rovah's setup is using an external wastegate mounted right under the turbo. I would prefer using an 35mm Tial myself. Did/Can Chad fabricate the uppipe like that?

Say I got a TD04 turbo, I want to go with an external wastegate. How do I disable the internal wastegate?

Thanks in advance.
I misplaced my Maximum Boost book

Marcin
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