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Typical Upgrade Path - 2.0 WRX

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  • 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.
    Duncan Graham
    email: duncan@racedynamix.com
    tel: 07540 185754
    Custom Mobile Remaps for: All Impreza/Forester 2001-2012 | Classics 92-98 ESL | Ecutek 1999/2000 onwards inc RaceRom| Syvecs (Solaris) | Simtek
    Nationwide Road Mapping and Dyno mapping around various dyno centres in the UK


  • #2
    Re: Typical Upgrade Path - 2.0 WRX

    Brill write up Duncan

    Comment


    • #3
      Re: Typical Upgrade Path - 2.0 WRX

      about time someone posted that very helpfull fm
      Men never grow up, the toys just get more expensive.
      309.1 bhp 290.6ibf.ft wheels 261.1@6186 rpm average on 3 runs 306.1

      Comment


      • #4
        Re: Typical Upgrade Path - 2.0 WRX

        is this the same for a classic, esl hope to have a ecu ready for mine soon (he told me early new year) will you be able to do them as well j
        in my 140bhp t5 camper

        Comment


        • #5
          Re: Typical Upgrade Path - 2.0 WRX

          I will be doing one for the classics - it is a lot more complicated as so many differences in spec and capabilities.
          Duncan Graham
          email: duncan@racedynamix.com
          tel: 07540 185754
          Custom Mobile Remaps for: All Impreza/Forester 2001-2012 | Classics 92-98 ESL | Ecutek 1999/2000 onwards inc RaceRom| Syvecs (Solaris) | Simtek
          Nationwide Road Mapping and Dyno mapping around various dyno centres in the UK

          Comment


          • #6
            Re: Typical Upgrade Path - 2.0 WRX

            yes i know j
            in my 140bhp t5 camper

            Comment


            • #7
              Re: Typical Upgrade Path - 2.0 WRX

              Duncan have you been writing about my car again lol.

              Comment


              • #8
                Re: Typical Upgrade Path - 2.0 WRX

                Lol yeah

                Incidentally I did have a pm from someone with a little too much time on their hands saying that a 2.0WRX with the VF35 and pink injectors would never get between 320-330. Yours and Jims must have been flukes
                Duncan Graham
                email: duncan@racedynamix.com
                tel: 07540 185754
                Custom Mobile Remaps for: All Impreza/Forester 2001-2012 | Classics 92-98 ESL | Ecutek 1999/2000 onwards inc RaceRom| Syvecs (Solaris) | Simtek
                Nationwide Road Mapping and Dyno mapping around various dyno centres in the UK

                Comment


                • #9
                  Re: Typical Upgrade Path - 2.0 WRX

                  Originally posted by dynamix
                  Lol yeah

                  Incidentally I did have a pm from someone with a little too much time on their hands saying that a 2.0WRX with the VF35 and pink injectors would never get between 320-330. Yours and Jims must have been flukes
                  Name and shame Dunk, name and shame!
                  The Lord Lucan of Scoobycity, hasn't been seen in months.

                  Comment


                  • #10
                    Re: Typical Upgrade Path - 2.0 WRX

                    Originally posted by dynamix
                    Lol yeah

                    Incidentally I did have a pm from someone with a little too much time on their hands saying that a 2.0WRX with the VF35 and pink injectors would never get between 320-330. Yours and Jims must have been flukes

                    Well if this person would like to come and see mine and Jim's im sure we could comply with showing him lol.

                    Comment


                    • #11
                      Re: Typical Upgrade Path - 2.0 WRX

                      thank you duncan answered all my questions in one there m8

                      Comment


                      • #12
                        Re: Typical Upgrade Path - 2.0 WRX

                        Originally posted by oldscoob
                        thank you duncan answered all my questions in one there m8
                        when's the remap then ?

                        Duncan Graham
                        email: duncan@racedynamix.com
                        tel: 07540 185754
                        Custom Mobile Remaps for: All Impreza/Forester 2001-2012 | Classics 92-98 ESL | Ecutek 1999/2000 onwards inc RaceRom| Syvecs (Solaris) | Simtek
                        Nationwide Road Mapping and Dyno mapping around various dyno centres in the UK

                        Comment


                        • #13
                          Re: Typical Upgrade Path - 2.0 WRX

                          soon as ive finished decorating dunc got keep her indoors happy

                          Comment


                          • #14
                            Re: Typical Upgrade Path - 2.0 WRX

                            good man - got to keep the lady happy
                            Duncan Graham
                            email: duncan@racedynamix.com
                            tel: 07540 185754
                            Custom Mobile Remaps for: All Impreza/Forester 2001-2012 | Classics 92-98 ESL | Ecutek 1999/2000 onwards inc RaceRom| Syvecs (Solaris) | Simtek
                            Nationwide Road Mapping and Dyno mapping around various dyno centres in the UK

                            Comment


                            • #15
                              Re: Typical Upgrade Path - 2.0 WRX

                              Not that i am really intending to but will a dump valve do any damage at all i have heard they can damage the turbo?

                              Comment

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