Mods! Where do I start and what is safe?
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This is a discussion on Mods! Where do I start and what is safe? within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; Hey everyone, glad to be part of subaru team. I finally got my 2003 Black WRX wagon which I love. ...

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    Mods! Where do I start and what is safe?

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ID:	113375Hey everyone, glad to be part of subaru team. I finally got my 2003 Black WRX wagon which I love. It's a sweet little beast but I would like to make more power out of it without hurting it so much. Where do I start with mods? It already got a full straight pipe exhaust (sounds awesome). Tokico gas shocks with "fat" racing springs (I looked those up, I think they are not that bad), everything else is stock. I want to go for 300hp at this point. Planning to boost it up to 450hp later, with a bigger turbo.
    Is it safe to go 300hp on a stock WRX turbo?

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    Quote Originally Posted by elijah.smith View Post
    I would like to make more power out of it without hurting it so much... Planning to boost it up to 450hp later, with a bigger turbo.
    Those two are mutally exclusive. If you're dead serious about such a goal, include multiple engine and drivetrain rebuilds/replacements in your budget.
    See this: I want 400WHP!!!1!juan!
    If you're still serious, I'd give either Bobby at PRE or the guys Cobb Surgeline in Tualatin a call and ask about a custom build. That's going to be very costly, but you've gotta pay to play, and we're lucky to have two very highly respected Subaru tuning shops in the Portland area.

    How many miles on it?
    What part of PDX? I'm in the Tualatin area.
    Last edited by Rambo; 04-15-2013 at 02:56 PM.
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    Welp...you should start with figuring out what has been done to it. By straight pipe, do you mean it's just an open pipe from the turbo back? Or is it a DP and CBE (turbo back exhaust)? Either way, if it has some sort of aftermarket downpipe that has deleted the cats, then you should be tuned...that would be Stage 2 if so.

    Otherwise...you have to start doing a lot of reading. The stock TD04 turbo won't be capable of 300hp...you're looking at a swap to get to that number but you also need the supporting mods and a tune to do that as well.

    If you're looking at 450hp later...you're looking at a new car.
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    I got 135k miles on the body and 112k on the motor, pretty sure that it has a catback. What supporting mods will i have to do iif i swap in vf39? What approximate power gains will i have? Thanks for your help.

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    Mods you may need is a Cobb ap and vf39 a Sti tmic and fuel pump and injectors for the 2.0 boxer

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    Quote Originally Posted by jasontee1 View Post
    Mods you may need is a Cobb ap and vf39 a Sti tmic and fuel pump and injectors for the 2.0 boxer
    An STI intercooler isn't going help much, other than maybe some added knock protection against the 92 octane gas we're stuck with. Your money would be far better spent on a quality aftermarket TMIC like Process West. If you're going for a large engine build anyway, don't waste time on the STI intercooler.
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    Quote Originally Posted by jasontee1 View Post
    Mods you may need is a Cobb ap and vf39 a Sti tmic and fuel pump and injectors for the 2.0 boxer
    You only need at least 565cc injectors (fuel pump is suggested though), and an appropriate tune, whether it's an Accessport map, or a protune of some sorts. Doesn't have to be an AP. STI TMIC is negligible.
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    Quote Originally Posted by Mikie13 View Post
    You only need at least 565cc injectors (fuel pump is suggested though), and an appropriate tune, whether it's an Accessport map, or a protune of some sorts. Doesn't have to be an AP. STI TMIC is negligible.
    STi TMIC has better cooling capability by virtue of the thermal mass increase over the stock WRX intercooler. It IS an upgrade. However, the pressure drop across the core of the STi TMIC (tube-and-fin) is still around 3 PSI -- similar to the stock WRX intercooler. A quality bar-and-plate TMIC has more thermal mass (despite a smaller size) and considerably less pressure drop -- a quality piece will drop less than 1 PSI at 20 PSI manifold relative pressure. This is a considerable increase to the total volumetric efficiency of the motor.
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    Quote Originally Posted by zax View Post
    STi TMIC has better cooling capability by virtue of the thermal mass increase over the stock WRX intercooler. It IS an upgrade. However, the pressure drop across the core of the STi TMIC (tube-and-fin) is still around 3 PSI -- similar to the stock WRX intercooler. A quality bar-and-plate TMIC has more thermal mass (despite a smaller size) and considerably less pressure drop -- a quality piece will drop less than 1 PSI at 20 PSI manifold relative pressure. This is a considerable increase to the total volumetric efficiency of the motor.
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    One important distinction to make is if you are talking about wheel horsepower or not. A good stage 2 setup (downpipe and tune), should get you to 300 crank horsepower.

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    Thanks everyone for advice, i really do aprreciate every advice since i'm a noob at this for now. I was interested in opensource ecu tuning. What cable do i buy and what software do you recommend that works with my 03 wrx?

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