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  • dynamix
    started a topic Typical Upgrade Path - 2.0 WRX

    Typical Upgrade Path - 2.0 WRX

    Again, a common question that I get asked about what should be done and what shouldn't etc so I will aim to do these for each significant model type.

    Firstly, a 2.0 litre WRX....

    In std form they are 220bhp give or take and have boost at about 0.9 bar. The boost profile in the std map is pretty tame and doesnt come in til 3500rpm assuming the car is std.

    so... choices

    1. Keep the car std but just remap for more oomph and better fuel economy.
    A full custom remap will bring boost in much earlier and hold higher boost levels for longer but the map will be geared to running much more efficiently ( which is also more economically) as it wont be possible to push too much boost with all 3 cats in place. Typically a Green/K&N/Cosworth air filter and a backbox are fitted at this stage.

    This would get the car to about 250-260bhp

    2. Sports cat in downpipe - remove centre cat
    A full custom remap will bring boost in much earlier due to the lower back pressure and hold much higher boost levels. The remap will also aim to get it running much more efficiently ( which is also more economically).
    Typically a Green/K&N/Cosworth air filter and probably a 3 port solenoid are fitted at this stage (on top of the sports cat downpipe and exhaust system).

    This would get the car to about 270bhp but a huge boost in torque figures in the mid range.

    3. Fully Decat Exhaust
    The low back pressure from removing all the cats is now the equivalent of the turbo running around the garden naked shouting "look at me I'm free". A remap is needed to bring it under control and stop overboosting. The remap will bring boost in as smooth as possible and most likely get full boost at around 2700 rpm and hold higher boost right through the rev range. The remap will also aim to get it running much more efficiently ( which is also more economically).
    Typically a Green/K&N/Cosworth air filter and probably a 3 port solenoid are fitted at this stage (on top of the decat downpipe and exhaust system).

    This would get the car to about 280-290bhp but a huge boost in torque figures in the mid range and transform the way the car drives on the road.

    A walbro 255 fuel pump is advisable but not 100% essential.

    4. Getting to over 300bhp
    A lot of people want to do this, it is a nice bhp figure for the pub afterall. So .. how ? The std TD04 turbo will not do it unless you are on a dyno that reads very optimistically. It will need a turbo off its bigger brother STi version.

    There are many many choices of turbo for this VF30, VF34, VF35, VF43, VF48, TD05 16G etc etc but all of these will need a couple of other changes to the car before hitting the mark safely.
    - STi Injectors - 550cc (Pinks)
    - Walbro 255 pump
    - worth changing the uppipe for a decat version
    - probably an STi TMIC although the WRX will suffice.

    It is also advisable to change to NGK PFR7B spark plugs.

    There is a lot of info around about the different turbos and what they are capable of - the VF35 makes the best upgrade in my opinion at the moment and should hit a nice safe 320-330bhp. This is pretty much an ideal level for the WRX keeping it within the capabilities of the engine, gearbox and clutch.

    Some other info:
    - a vent to atmosphere dump valve will not improve the performance but if you must fit one for the sound then stick to a good make - forge have always been good from what I have seen. (Baileys are less so)
    - a FMIC is not needed at this stage and tbh is always the wrong mod to do on a WRX.
    - an induction kit will most likely not improve performance as the std airbox is very good. If you do want more induction noise then go for a cold air induction kit such as the K&N typhoon where the filter is located away from engine bay heat.

    Anyway ... hope that is useful.

  • bogger
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    What money are we talking for a remap of 300+ based on that the turbo, injectors and exhaust have been done? Just as a rough guide?

    Leave a comment:


  • gary64
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    hi steve just vf35 550 injectors walbro 3 port solenoid du luck filter sti tmic scoop n undertray
    prodrive back box 2 1/2 decat pipe sti down pipe all decated
    had roll n roll came back as 307 bhp mapped by duncan he said should have made 325 probly
    due to me using tesco 99 so i now use shell v-power
    i would like an sti but the wrx is easier on the pocket ie tax insurance etc

    duncan would i need any other mods to fit vf48 ie fmic cold air induction new ecu
    gary

    Leave a comment:


  • dynamix
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    Originally posted by gary64 View Post
    hi duncan just wondered what you think of me putting a vf48 on my car?
    also if this is too strong for my wrx im looking at selling it and buying a type_r
    what do you think
    gaz
    Have mapped a MD321H on a wrx engine and box and got 411bhp from it so I think the VF48 will be just fine

    Leave a comment:


  • Steve
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    What other mods do you have Gaz.

    Leave a comment:


  • gary64
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    hi duncan just wondered what you think of me putting a vf48 on my car?
    also if this is too strong for my wrx im looking at selling it and buying a type_r
    what do you think
    gaz

    Leave a comment:


  • shane
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    Originally posted by gtrr32 View Post
    where are you based m8
    Duncan is based in Ely, But does travel all over the UK, Well worth it mate

    Leave a comment:


  • gtrr32
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    where are you based m8

    Leave a comment:


  • Steve
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    I never did change them.

    Leave a comment:


  • gtrr32
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    when would you need to upgrade the coil pack on a wrx. I would be going for 300 to 330 bhp

    Leave a comment:


  • Steve
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    Well said

    Leave a comment:


  • scoobaru
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    Leave a comment:


  • Jon
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    

    Leave a comment:


  • scoobaru
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    Originally posted by James View Post
    Your just jealous cause he'll be quicker than you
    Lol alot of people will soon have faster cars because I can't afford the 6 SPd conversion so I have to be happy with my measly 350bhp 360lbft and let it stay reliable, I can't imagine what 286 bhp is like probably similar to the kind of power Lance Armstrong produces (on a bad day pedalling into the wind)

    Leave a comment:


  • Steve
    replied
    Re: Typical Upgrade Path - 2.0 WRX

    Now now boys

    Leave a comment:

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