Couple of Questions, Before Making The Switch...
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This is a discussion on Couple of Questions, Before Making The Switch... within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; I currently drive a 2004 Mazda RX8. Before this, I had a 1988 RX7 Turbo2...and, to put it simply, I ...

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    Couple of Questions, Before Making The Switch...

    I currently drive a 2004 Mazda RX8. Before this, I had a 1988 RX7 Turbo2...and, to put it simply, I caught the "boost bug".

    The RX8, while it is a TON of fun, and I love the looks, is not the car for me. I'm looking for something that I can have fun in, is turbo, and yet can be daily driven (hint: AWD).

    I have a couple of cars I'm looking at right now, but for the most part, the WRX is at the top of my list. I would just like to ask a few questions, sorry if they've already been answered, I'm horrible at searching :-P!

    -On average, how long would you say the typical WRX engine would last? I only ask because, within my price range, I am only finding WRX's with 40,000 and up on the odometer. I'm not familiar with Scoobie's at all, so I'd just like to get an idea of what I'm up against.

    -What is the most power that can be made on the stock WRX, or STi, turbo? Also, what do the terms "VF34" and "VF39" mean? Are those the stock WRX and STi turbo models? I have seen them thrown around a lot on the forum, and am just wondering.

    -When doing full flow-mods (read: intake, exhaust) what mods must be performed to avoid..a bad situation? I know with RX7 turbos, when doing full intake and exhaust, wastegate porting + fuel mods are necessary. What about on the WRX/STi?

    -This goes along with the above questions. What driveline modifications must be done with uping the power output? I've heard a lot (possibly just rumors, but I'd rather put them to rest or hear the truth) about the transmissions and clutches in the WRX being a very weak point. If this if true, what is the fix for this? The obvious choice for the clutch is to upgrade..but what of the transmission? STi swap, etc?

    Thanks for taking the time to answer my questions, I hope to be "officially" joining the club very soon

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    Registered User D0WNxSH1FT's Avatar
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    Quote Originally Posted by adrock3217 View Post
    I currently drive a 2004 Mazda RX8. Before this, I had a 1988 RX7 Turbo2...and, to put it simply, I caught the "boost bug".

    The RX8, while it is a TON of fun, and I love the looks, is not the car for me. I'm looking for something that I can have fun in, is turbo, and yet can be daily driven (hint: AWD).

    I have a couple of cars I'm looking at right now, but for the most part, the WRX is at the top of my list. I would just like to ask a few questions, sorry if they've already been answered, I'm horrible at searching :-P!

    -On average, how long would you say the typical WRX engine would last? I only ask because, within my price range, I am only finding WRX's with 40,000 and up on the odometer. I'm not familiar with Scoobie's at all, so I'd just like to get an idea of what I'm up against.

    -What is the most power that can be made on the stock WRX, or STi, turbo? Also, what do the terms "VF34" and "VF39" mean? Are those the stock WRX and STi turbo models? I have seen them thrown around a lot on the forum, and am just wondering.

    -When doing full flow-mods (read: intake, exhaust) what mods must be performed to avoid..a bad situation? I know with RX7 turbos, when doing full intake and exhaust, wastegate porting + fuel mods are necessary. What about on the WRX/STi?

    -This goes along with the above questions. What driveline modifications must be done with uping the power output? I've heard a lot (possibly just rumors, but I'd rather put them to rest or hear the truth) about the transmissions and clutches in the WRX being a very weak point. If this if true, what is the fix for this? The obvious choice for the clutch is to upgrade..but what of the transmission? STi swap, etc?

    Thanks for taking the time to answer my questions, I hope to be "officially" joining the club very soon
    1) Welcome to the club, post pics of your RX-7/8

    2) A properly maintained, unmodified Subaru EJ motor will last well past 100,000mi. Modified ones, well, that is dependant upon if they they were properly modified or not.

    3) Stock STi Turbo can make around 300whp. Stock WRX turbo can make around 240whp MAX.

    3a) Turbo Codes:
    • WRX = Mitsubishi TD04-13T
    • STi = IHI VF-39
    • STi Type RA (japan) = IHI VF-34 [despite # it is larger than VF39]


    4) Get a catless Downpipe, catless Up-pipe, and reflash the ECU for Stage 2 (55whp over stock on the WRX).

    4a) You dont need an intake unless you get a Front Mount Intercooler. The stock Intake is perfect.

    4b) Fuel upgrades arent needed until a turbo upgrade.

    5) 02 WRX had a weak Transmission. All other models (especially 04+) have a beefed up Tranny. You could do an STi swap, Type RA gears or PPG gears but it is not necessary. The stock clutch, might be old if you want high mileage, is good for most power upgrades unless you hit 300whp +.
    Last edited by D0WNxSH1FT; 11-08-2006 at 10:39 PM.
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    Registered User Aerophyre's Avatar
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    downie covered most of the points very well but ill just elaborate on a few:

    VF 39 is the stock STi turbo, and alot of WRXs like to upgrade to the 39 for good power. The VF-34 is a very common turbo upgrade for WRXs because it gives almost stock spool up with improved power and response.

    As far as bad mods, BOVs and MBC's (blow off valves and manual boost controllers) are generally avoided like the plague, and aftermarket intakes are usually only allowed with dyno tuning. When upgrading the turbo, you must have at the very least a bellmouth downpipe and catless uppipe, upgraded fuel pump, and larger injectors. A larger intercooler is also highly recommended.

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    they got it all covered so.... Welcome
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    What more can I say ... it has been all said very well above.

    Greetings and welcome to the club!
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    Alright so, just to clarify...

    On the stock WRX turbo, I can do..full exhaust (completely catless), with ECU flash, and not worry about any lean conditions?

    Also..with an electronic boost controller, and the above mods, what would be the maximum boost I am able to run?


    Sorry for all the questions. I'm just coming out of my RX7 stuff..where all this stuff is different. Fuel upgrades are needed for intake and exhaust..can only run 12-13psi on stock turbo reliably, etc..

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    Registered User D0WNxSH1FT's Avatar
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    Quote Originally Posted by adrock3217 View Post
    Alright so, just to clarify...

    On the stock WRX turbo, I can do..full exhaust (completely catless), with ECU flash, and not worry about any lean conditions?

    Also..with an electronic boost controller, and the above mods, what would be the maximum boost I am able to run?


    Sorry for all the questions. I'm just coming out of my RX7 stuff..where all this stuff is different. Fuel upgrades are needed for intake and exhaust..can only run 12-13psi on stock turbo reliably, etc..
    Stock Turbo, Catless Exhaust (you could run 1 cat since stock we have 3), ECU flash...you wont have any lean conditions unless you got a tune that was leaner.

    If you got a Cold Air Intake you would create a Lean condition.
    If you get a blow off valve you will create a RICH condition.

    If you get an 02-03 WRX you can use a Boost controller. *not recommended tho.
    If you get an 04-07 WRX you cannot use a Boost Controller safely.

    Advice: Cheapest, safest, best bang/buck = Cobb Access Port Stage 2 ($695 AP [cheaper if you get a Version 1 that is used] + any Catless DP). 55 whp over stock, air/fuel ratios adjusted, timing changed, 14.5psi (13.5 stock on 02-05), all CEL cleared, and you will pass inspection [***you may require 1 cat in your state like CA and NY]
    2008 Satin White Pearl WRX Sedan w/ Navi
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    Registered User WRXED06's Avatar
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    welcome to the club

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    Quote Originally Posted by WRXED06 View Post
    welcome to the club
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