('03-'05) 2004 FXT swap to VF39 and STI TMIC - Subaru Forester Owners Forum
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post #1 of 19 (permalink) Old 08-12-2015, 03:43 AM Thread Starter
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2004 FXT swap to VF39 and STI TMIC

Hi Guys

I'm in the process of doing swapping in a VF39 and STI TMIC into my 2004 FXT. And I'd like some advice / tips for the SWAP

I have
VF39
STI TMIC
Accessport V3 , I plan on running the VF39 MAP with 91.

Can I run this map with stock exhaust without hurting the engine?

Also I plan on ordering the following parts for the swap
Vaccum Hoses- 14447AA090 $18.83
Boost Restrictor Pill w/hose assembly does not come as a whole assembly the pill does come separate the price on that is $1.68
Oil line washers 803912040- $1.05 x2 803910050- $0.95 x2
Oil feed line Banjo bolt- 15194AA110 $11.72
Turbo to down pipe gasket- 44022AA180 $18.53
Oil filter- 15208AA12A $5.06
Oil pan crush washer- 11126AA000 $0.77

Is there anything else that should be done?

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post #2 of 19 (permalink) Old 08-12-2015, 04:29 AM
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I'd order a braided oil supply line, replace the hard pipe. Makes it sooo much easier. Don't know why you're replacing the banjo bolt itself. Also, the up-pipe to turbo gasket would be good to change. That one is more important than the downpipe gasket.


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post #3 of 19 (permalink) Old 08-12-2015, 04:59 AM Thread Starter
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Thanks Ozark08

Do you have a part number or size for the braided oil supply line. Ok I'll ask for a price on the up-pipe gasket
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post #4 of 19 (permalink) Old 08-12-2015, 02:34 PM
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If you are talking about using the Cobb map, read the release notes, it will tell you what hardware configuration it was designed for. Without bothering to look, I would bet you a paycheck that it is meant to use an aftermarket downpipe, which will be a significantly different tune than all stock exhaust.

Can you run it without hurting the engine? You could undoubtedly tiptoe around town staying out of boost, until you can schedule a proper tune, and be fine. If you want to really drive it to potential as a long term solution, I don't know if it will be dangerous, but it will definitely be sub-optimal.

The tune is so important with these cars, if you need to cheap out on any one area, this is not the one to choose. A good dyno tune is about $500, a motor rebuild might be $8,000, depending on local shop rates. Knock a couple grand off that number if you can do most of the work yourself.
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post #5 of 19 (permalink) Old 08-13-2015, 03:24 AM Thread Starter
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Thanks Northman,

Not trying to cheap out at all, there is nobody within 800 miles that could tune my car, so I ordered a Accessport.

Just wondering what to do because I'm going to have a VF39 installed and a STI TMIC, but for now will be using stock downpipe and stock exhaust.

Ryan
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post #6 of 19 (permalink) Old 08-13-2015, 04:17 AM
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Any of the turbo manufacturers will also sell the oil supply. Here's one example, but you may be able to find it cheaper. Products | Element Tuning

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post #7 of 19 (permalink) Old 08-13-2015, 05:41 AM
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I think there is a AP tune for just the turbo, and one with a different DP. You could always ask Cobb about a different map if you plan on running the stock exhaust. I would look into replacing the up pipe also if you have not done that yet.
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post #8 of 19 (permalink) Old 08-13-2015, 05:42 AM
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Way better price- Turbo Oil Feed Line SUBARU STI VF30 VF35 VF37 VF39 VF43

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post #9 of 19 (permalink) Old 08-13-2015, 05:47 AM
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I dont think its that one, thats for non-avcs (I made that mistake before)

Turbo Oil Feed Line SUBARU AVCS IHI VF40 VF46 VF52

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post #10 of 19 (permalink) Old 08-13-2015, 09:58 AM Thread Starter
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Thanks Joshua,

So that line should work on a VF39 as well I hope?

Also I just talked to Cobb about a VF39 STI TMIC Map and they said they didn't have one, and they were not very happy at all. Makes me think what is the sense of an Access port if there is only a couple of maps available.

I'm disappointed with Cobb might be 700 dollars wasted to have a glorified code reader.

does anybody have a good price on a turbo back exhaust?

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post #11 of 19 (permalink) Old 08-13-2015, 10:06 AM
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Even the OTS maps are really just a baseline. They need quite a bit of tweaking to be happy. An e-tune may be a good way to go.

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post #12 of 19 (permalink) Old 08-13-2015, 10:07 AM
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I see one for the STI TMIC on there
COBB Tuning - 2004 Subaru Forester XT MT Stage 3 VF39 Turbo Map

Quote:
DESCRIPTION

FXTVF39+STiIC 91MTv300, using 49 state 91 or 92 octane fuel. Requires VF39 turbo, STi TMIC, stock fuel injectors, stock intake or Cobb Tuning SF Intake, and turbo-back exhaust system. v300
I am not 100% sure on that oil line, as long as the hole coming out of it at the turbo is the same size the vf39 needs. It will screw into the turbo, but its the size of that hole that is important. I just know the other one didnt fit, its still sitting in my tool box to put on my impreza (no avcs) whenever I get it running now.

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post #13 of 19 (permalink) Old 08-13-2015, 12:47 PM Thread Starter
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Thanks

Yeah that's the map from Cobb that I planned on using , however they said not to run it with stock exhaust. However my good friend very knowledgeable with cars talked to a tuner in Arizona , and he said to just turn back the timing due to the stock exhaust and you will see a decrease in horsepower but everything will be fine.
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post #14 of 19 (permalink) Old 08-13-2015, 01:04 PM
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Downpipe has to come off to do the turbo swap, might as well do that since its off already :)

I got a CNT bellmouth catless for just over $100

To add to your list:
Rear donut gasket
Up pipe gasket
I'd replace the turbo drain line and clamps
remove the avcs filter
you'll need the STI BPV and a wrx BPV hose (when I tried to use the STI one it was too short YMMV)
Maybe a BPV gasket (STI)
also check your inlet for tares at the turbo (common problem)

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post #15 of 19 (permalink) Old 08-13-2015, 02:05 PM
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I would first figure out who will be tuning the car, then replace hardware.

AP IS a very expensive device and is pretty useless on it's own, but most tuners will need you to have it so they can write a tune for it using COBB's tuning software they already have.

Stan

Shocks > struts.
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