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Old 08-22-2020, 12:09 AM   #1
typeZero
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Join Date: Oct 2017
Location: Las vegas,nv
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2004 Forester XT
Black

Default Need possibly some advice

Hey guys so..I have the STi bug again, I recently sold my genesis coupe last month. Went and picked up an 04 Forester XT, that I want to do an STi swap to. Currently having misfires not sure if due to fueling or tuning issues right now, I need to get to a tuner to tell me if this sputtering I have is from the tune or possibly a fuel pump or something. I went the route of getting an XT so I could have more space and can take my time building it but thinking now I need something more turn key and with a Little bit better gas mileage.

So basically option one, the motor I have in the XT is healthy, I was thinking I could get myself a 6 speed swap hopefully with everything working and get that done.(kinda been hard to find everything since covid).

Option 2
Buy a 2017 STi for 30k its CPO and has 36k miles or buy a 2015 WRX for 20k 64k miles or a 2018 WRX for 24k with 20k miles.


More info


So I bought an 04 Forester XT with mods on it. I can't figure out why it's misfiring. I took it to a local shop they told me I had no boost leaks, compression and leak down came back fine. I have an issue where when I go to accelerate in 2nd-5th around 2500rpm the car stutters bad like the engine is choking and is about to stall. Once it gets past around 2800 rpm it is fine but when when boost starts to come on its like my turbo is having trouble. I the accessport doesn't show it going past 8psi in 5th and the other gears it barely makes it past 4 psi. I noticed this after getting it back from the shop.

From what I know it has
1000cc injector dynamic injectors
Injector dynamics side feed to top feed conversion
18gxt-R 10cm turbo
K+n Short ram intake
Grimmspeed up pipe
Grimmspeed 3" catted downpipe .

The car came from Utah it was fine accept the 5th gear it had that stuttering issue but driving the car in Las Vegas it performs worse.

I have a tuning appointment set up but I'd like to get some ideas of what I may need to replace before then. Because right now it seems like the turbo isn't breathing properly.
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Last edited by typeZero; 09-06-2020 at 04:02 AM.
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Old 08-23-2020, 07:40 PM   #2
scoobiestevie
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Well is this car going to be a daily, or more of the weekend car? If it's for a DD it's always nice to have something covered by warranty and the weekend car can be more the fun project car in my opinion. I don't follow this rule but its what I always advise
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Old 08-24-2020, 12:37 AM   #3
subaru_gc8
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2004 WRX wagon
silver

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Sti is great, but for utility the forrester is going to be alot better. I would fix the misfire and just drive that. wait til the 2021 STI comes out and go after that

BTW I would start with coils
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Old 08-26-2020, 08:45 AM   #4
typeZero
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Well I'd drive both cars, probably an even split. The STi sold, so I'm pretty much in the waiting stage to find another one. I'm set on getting a 2018+ the front end just looks more aggressive to me. I also did replace the coils and spark plugs it still does the same thing. Can't source this issue the shop that looked at it thinks it is the tune.
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Old 08-26-2020, 11:42 AM   #5
Samurai Jack
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Quote:
Originally Posted by subaru_gc8 View Post
but for utility the forrester is going to be alot better. I would fix the misfire and just drive that.
^^^^ This

I specifically bought a WRX Wagon for the utility of it over a sedan. Have never regretted it.

If the coil and plug swaps have not changed anything, did you make sure the coil connectors are secured? Sometimes the connector breaks or comes loose.

Could be the tune or the timing. I'd find a good tuner and have it re-tuned.

As always, if you fill out your profile, people will see where you are and be able to suggest tuners in your area.
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Old 08-27-2020, 08:08 PM   #6
typeZero
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So I winded up deciding on going with snail performance for my tune after a couple of hiccups I just realized I may have given them the wrong information for my base map. The previous owner said it was a bpt 18gxt-R but looking at the maps and description it says 16gxt-r would that have a big impact on the tune as well as why it's been driving so rough? The connectors look fine, I did see the accessport needed an update though so I got that squared away.

Last edited by typeZero; 08-27-2020 at 08:23 PM.
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Old 08-28-2020, 11:58 AM   #7
Samurai Jack
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You would be best if you check with your tuner.
Was this an e-tune or did they tuner the vehicle at their shop?

I don't know how they make all their corrections during the tune but, a good tuner will see the air flow and make adjustments accordingly.

If it's an e-tune, I would presume they use the flow characteristics of the designated turbo and work their magic with what you provided.

A simple phone call should get you your answers.
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Old 08-28-2020, 01:46 PM   #8
Max Capacity
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FWIW, the stuttering issue is common on Legacy GT's in the same rpm range.

Most of us have had good luck, putting a T in the small vacuum hose off the blow off valve on the tmic. then remove the vacuum hose from #4 intake runner and attach it to the T. Plug the port in the intake runner.

Reset the ECU and drive the car.

I have done this on both my cars.
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Old 09-03-2020, 11:48 PM   #9
speedyHAM
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Quote:
Originally Posted by subaru_gc8 View Post
Sti is great, but for utility the forrester is going to be alot better. I would fix the misfire and just drive that. wait til the 2021 STI comes out and go after that

BTW I would start with coils
This is solid advice. At that mileage the coils are likely going bad, or already bad.
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Old 09-06-2020, 04:10 AM   #10
typeZero
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2004 Forester XT
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Yeah I already changed the coils and plugs before I got the leak down, compression, and smoke test. I did notice a split in the hose on the bypass valve on the inter cooler duno if thats the issue but the hose seems tight. Been through like 5 different revisions with the my tuner and the same issue is happening. not sure if I should start looking to seeing if the Timing is correct or if my headers could be my issue. I'm pretty much stumped unless the hose is the issue.

Also just popped a p1312 code driving this morning hopefully this helps me source the problem now.

Last edited by typeZero; 09-06-2020 at 03:34 PM.
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Old 09-07-2020, 09:38 AM   #11
Samurai Jack
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Quote:
Originally Posted by typeZero View Post
I did notice a split in the hose on the bypass valve on the inter cooler duno if thats the issue but the hose seems tight. I'm pretty much stumped unless the hose is the issue.
That is a good sized split. Although it may seem tight, very good chance this is leaking.

Strongly suggest you replace this. At the very least, you will eliminate a possible issue. If it's not an issue now, it very soon will be.
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Old 09-12-2020, 11:09 PM   #12
typeZero
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2004 Forester XT
Black

Default

I'm going to get another hose for it, I'm in between buying another FXT stock or just starting off with a new motor, sensors and hoses etc, on this one. I know I popped a p0171 code as well yesterday. Was thinking maybe the 02 sensor was dying when to test it with a multimeter and seems to be functioning. Taking the car back tot he shop Tuesday, hopefully they can check on the 02 and MAF and see if those are my issues.

I think I may have figured it out, I noticed cracks in my up pipe, I'm suspecting since it looks pretty rusty because it was driven in the snow this is the cause of my issue? I'm going to be pulling the down pipe and the rest of the exhaust as well later this week. Anything I should look out for that could have caused damage to the turbo or anything else?

Last edited by typeZero; 09-13-2020 at 10:13 AM.
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Old 09-20-2020, 02:19 PM   #13
dadscruizzzer
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Second reply just for quota.
I’ve enjoyed my 04FXT since 04. I can’t seem to let it go.
It’s a fun utility sleeper. I hope you get the issues fixed. Enjoy!
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