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Typical Upgrade Path – Newage Impreza 2.0 STi


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2.0 litre STi from 2001 – 2005 ….

 

 

 

In std form they are 265bhp give or take and have boost at
about 1.2 bar but this varies according to model. The boost profile in the std
map is pretty tame and doesnt come in til 3500rpm assuming the car is std.

 

 

 

so… choices  .. (all
based on using vpower)

 

 

 

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 both cats in place. Typically a Green/K&N/Cosworth
air filter and a backbox are fitted at this stage.

 

 

 

With a simple remap on the standard car typically this would
get 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 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 is fitted at
this stage (on top of the sports cat downpipe and exhaust system). A walbro 255
fuel 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 boost
in torque figures in the mid range.

 

 

 

3. Fully Decat Exhaust

 

The low back pressure from removing all the cats reveals the
true characteristics of the boxer engine. 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 (and higher ) boost at around 3300 rpm
(depending on turbo surge point) 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 possibly 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 330-350bhp but I have seen
them up to 365bhp on the std turbo 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 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 wants
to produce power with the std turbo but if you want to gtee over 350 there are
a number of turbo options and rather than list them all here – gimme a shout
and see which of the many turbos around could fit your requirements. There are
lots 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 it
can be an expensive step going from 350 to 450 so again get lots of advice
beforehand and decide whether you really want to chase the big numbers as it
becomes a diminishing return for the money outlayed.

 

 

 

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 but can be a good
improvement on the STi tmic when above 350 – the sti tmic can support up to 400
ish bhp though for road use.

 

– 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. It may be that the time you ‘need’ to change
to an induction kit then a FMIC may be being fitted so it would need to be one
that 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

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