Gambit Posted September 25, 2015 Share Posted September 25, 2015 2.0 litre STi from 2001 – 2005 …. In std form they are 265bhp give or take and have boost atabout 1.2 bar but this varies according to model. The boost profile in the stdmap is pretty tame and doesnt come in til 3500rpm assuming the car is std. so… choices .. (allbased on using vpower) 1. Keep the car std but just remap for more oomph and betterfuel 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 both cats in place. Typically a Green/K&N/Cosworthair filter and a backbox are fitted at this stage. With a simple remap on the standard car typically this wouldget the car to about 290bhp (blob eyes may make slightly more) 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 is fitted atthis stage (on top of the sports cat downpipe and exhaust system). A walbro 255fuel pump is essential. It is also advisable to change to NGK PFR7B spark plugs. This would get the car to about 320-340bhp but a huge boostin torque figures in the mid range. 3. Fully Decat Exhaust The low back pressure from removing all the cats reveals thetrue characteristics of the boxer engine. A remap is needed to bring it undercontrol and stop overboosting. The remap will bring boost in as smooth aspossible and most likely get full (and higher ) boost at around 3300 rpm(depending on turbo surge point) and hold higher boost right through the revrange. The remap will also aim to get it running much more efficiently ( whichis also more economically). Typically a Green/K&N/Cosworth air filter and possibly a3 port solenoid are fitted at this stage (on top of the decat downpipe andexhaust system). This would get the car to about 330-350bhp but I have seenthem up to 365bhp on the std turbo but a huge boost in torque figures in themid range and transform the way the car drives on the road. A walbro 255 fuel pump is essential. It is also advisable to change to NGK PFR7B spark plugs. 4. 350bhp – 400bhp You may be one of the lucky ones and have a car that wantsto produce power with the std turbo but if you want to gtee over 350 there area number of turbo options and rather than list them all here – gimme a shoutand see which of the many turbos around could fit your requirements. There arelots of suppliers of turbos and they are changing all the time. The car’s engine and gearbox can cope with this power well. 5. Getting to over 400bhp The std STi engine has been proven to up to 450bhp but itcan be an expensive step going from 350 to 450 so again get lots of advicebeforehand and decide whether you really want to chase the big numbers as itbecomes a diminishing return for the money outlayed. 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 but can be a goodimprovement on the STi tmic when above 350 – the sti tmic can support up to 400ish bhp though for road use. – 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. It may be that the time you ‘need’ to changeto an induction kit then a FMIC may be being fitted so it would need to be onethat works well with your chosen fmic. 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.andyforre...co.uk/4436.html 2 Quote Link to comment Share on other sites More sharing options...
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