Gambit Posted September 25, 2015 Share Posted September 25, 2015 In std form they are 220bhp give or take and have boost atabout 0.95 bar. The boost profile in the std map is pretty tame and doesn't comein til 3500 rpm 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 andhold higher boost levels for longer but the map will be geared to running muchmore efficiently ( which is also more economically) as it wont be possible topush too much boost with all 3 cats in place. Typically aGreen/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 tothe lower back pressure and hold much higher boost levels. The remap will alsoaim to get it running much more efficiently ( which is also more economically). Typically a Green/K&N/Cosworth air filter and probably a3 port solenoid are fitted at this stage (on top of the sports cat downpipe andexhaust 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 theequivalent of the turbo running around the garden naked shouting “look at meI’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 fullboost at around 2700 rpm and hold higher boost right through the rev range. Theremap will also aim to get it running much more efficiently ( which is alsomore 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 andexhaust 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 theroad. 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 forthe pub after all. So .. how ? The std TD04 turbo will not do it unless you areon a dyno that reads very optimistically. It will need a turbo off its biggerbrother 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 otherchanges 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 themoment and should hit a nice safe 320-330bhp. This is pretty much an ideallevel for the WRX keeping it within the capabilities of the engine, gearbox andclutch. Some other info: – a vent to atmosphere dump valve will not improve theperformance 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 thewrong mod to do on a WRX. – an induction kit will most likely not improve performanceas the std airbox is very good. If you do want more induction noise then go fora cold air induction kit such as the K&N typhoon where the filter islocated away from engine bay heat. Anyway … hope that is useful. The information was provided by Duncan http://www.racedynamix.co.uk/ This information is provided as a guide and not to be used to argue who's the best mapper As we're a non biased club :) Mappers contact details for some reputable mappers: Racedynamix mobile : 07540 185754 email : duncan@racedynamix.com http://www.racedynamix.co.uk/remap/ Scoobyclinc Tel: 01246 590807 Email: info@scoobyclinic.com Nether Farm Stubbing Court Wingerworth Chesterfield S42 6QX http://www.scoobyclinic.com/ Area 52 Autosport Unit 2 Park Court Park Lane Business Park Kirkby-in-Ashfield Nottinghamshire NG17 9LE http://www.area52autosport.com/ Andy Forrest Performance CONTACT sales@andyforrestperformance.co.uk Payments via paypal@andyforrestperformance.co.uk Tel 01875 811811 AFP Harbour Garage Port Seton East Lothian EH32 0DS http://www.andyforrestperformance.co.uk/4436.html 3 Quote Link to comment Share on other sites More sharing options...
2004wrx Posted February 1, 2016 Share Posted February 1, 2016 For point 3 what exhaust would you recommend? Quote Link to comment Share on other sites More sharing options...
GeoffLeggy Posted February 1, 2016 Share Posted February 1, 2016 http://www.haywardandscott.com/subaru.html All the way baby! Quote Link to comment Share on other sites More sharing options...
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