2003 uk wrx / jap variations tuning
 

hi guys im looking for some info in regards to actually what the differance is between uk wrx and sti and jap spec wrx and sti ?

ie what makes jap have more power ?

are the engines the same ?
gearboxs same ?


do newer models ie 2003 model year engines fit into gc8 models etc

hopefully ive explained what im looking to find out

thanks

UK WRX don't have AVCS heads and JDM WRX have AVCS Heads and due this making more power and turbo spools better

Second difference is in the internals between the JDM STi and UK STi,cams are slightly hotter and not sure if is there difference between the ECU(i know difference is when you have ECU mapped via EcuTek and JDM STi can have LC and UK STi don't)

As i said engine difference between the JDM WRX and UK WRX in AVCS and few other bits

Gearbox think are same,only JDM come with 4EAT with tiptronic and only on v7 onwards.

Jura

i see

thanks for that

very informative

and do you know if engines and gearboxs from gc8 will fit straight into newer hawk eye 2003 version impreza ?

if you want more info on why im asking pm me and ill explain


cheers

Hi there

Gearbox will fit,but you will need matched diff etc,if you have will fit

About the engine,only short block with heads will fit,but not sure,someone this can confirm for sure there

Jura

To start with, as stated, the JDM wrx has avcs, is mapped for a higher octane fuel and has really crappy brakes (2 pots on the front, single on the rear, backwards step compared to the 4 pot subaru front and 2 pot rear on a UK wrx).

STI's are totally different, the shell is about the only thing similar, engines are twin scroll v single scroll, different uprated internals in the twin scrolls (though they do share parts like the rods), gearboxes are different, some are A-DCCD boxes, most have quick rack steering (those without A-DCCD will have fast rack), different rear diff, rear wiper etc, far too much to list really, but there are also differences in the ecu's (more features like the i/c auto etc).

I doubt it would be straight forward to drop a UK engine into a JDM car and vice versa, though you could get away with parts between the WRX's, the JDM twin scroll really wouldnt be an easy swap without replacing the engine, manifold and exhaust system due to it being different to the single scroll item(s)

Tony:)

is a complete transplant of a gc8 engine, box diffs and suspension into a newer shell possable ?

You could do the engine, box and diffs but I doubt the suspension would fit.