tonywrx

evening everyone i recently looked up my engine code on the sidc faq and its states my wrx wagon is a my98 model 280ps but i was wondering why it was on a p reg, the engine code is gf8e58d. i just thought it should surely be on a later reg or am i missing something. regards

Subaru Impreza FAQ

tonywrx

anyone!

jonny gav

iTrader: (1)

the MY98 was actually brought out in 1997, i had a MY95 wrx that was a 1994 car.

tonywrx

oh i see well all seems ok then quite impressed with the 280ps though

silent running

Mine is also a GF8E58D - a MY98 WRX wagon. 280ps is wrong. It's 250 with a compression ratio higher than the saloon for better low down performance, running basically a UK Turbo 2000 inlet tract - TD04 and the smaller MAF.

If it's any consolation, it's the highest powered classic WRX wagon that they made. The v5/MY98 had 240 bhp IIRC and previous models had as low as 220.

Mine's an S reg, by the way but that was imported new so presumably took a late registration letter.

tonywrx

how come sidc states 280ps i am quite confused. so can i fit the larger maf and the td05 as i have ordered the apexi pfc.

silent running

Because it's wrong. I haven't looked at the SIDC FAQ for quite a while, but the classic WRX wagons NEVER had 280bhp. The STi wagons had the same engine spec as the STi saloons, but the WRX wagons were different, a kind of halfway house between the UK and Jap saloons.

But yes, you can do what you want to the inlet tract if you like. You can stick with the same size MAF and change it to a Z32 if you really think you're going to max out the airflow, a Power FC is no problem, nor is a TD05. And I've done all three of those mods.

From Chris Rees' Haynes very comprehensive book:

'Impreza WRX Sports Wagon Sep 1997-Aug 1998
As 1996-1997 except:
Compression ratio 9.0:1
Power output 250PS@6000rpm (240ps with automatic)
Torque 306NM (225 lbft) @4000 rpm
Specific output 125PS/litre
Power-to-weight ratio 192PS/tonne'

THat's taken from another 8 pages of detailed stats on every single model...
Hope it helps!

tonywrx

crystal clear now, cheers sowould mods do yo recommend, cheers tony

silent running

Well I'm no authority on this, I can only tell you what I personally have done:
Apexi Power FC & TD05-16G mapped by Zen to 1.45 bar
Rebuilt bottom end
Rebuilt gearbox, API/Exedy clutch and flywheel
FMIC with K&N induction kit and insulated pipes
Yellow 440 injectors, Walbro fuel pump, SARD regulator@3.5bar, reverse flow
Wrapped and ported (by Harvey Smith) headers & uppipe
Wrapped sports cat downpipe & rest of system H&S/STi
Inlet manifold & header tank insulating spacers

There's loads more suspension mods and other tweaks but that's the basic engine spec at least. It goes well.