davoid

Hello

I'm buying a jap import facelift estate WRX (Oct 1996), but I'm irritated to find out that the motor in the estate models produce considerably less power and torque than the equivalent sedan (240 vs 280 bhp). Does anyone know what it is that is responsible for this difference, and how I can rectify or otherwise fix it?

cheers
dave

scoobyman95

turbo in a import is a td04 in the sedan it is a td05 easy to change have done it to mine no need to change ecu or have a remap and I am getting 350 out of my wagon

coulty

if you have the wagon with the td04 and put the td05 in then you WILL need to change the map. It will run in completely different load zones and therefore there is a high chance it will det.

I will refer you to this post: https://www.scoobynet.com/general-te...questions.html

Here del (who can map incidentally) explains this very thing.

silent running

Subaru rightly assumed that people who bought saloons and wagons drive differently. A wagon which may well end up lugging a heavy load in the back or towing stuff needs a greater proportion of mid-range torque rather than top-end power. Seeing as you always use the smallest turbo you can get away with to give you your target output, because that keeps your turbo working in its most efficient zone, the WRX wagons (and UK Turbos) used a TD04 rather than a TD05.

IIRC, a MY98 WRX wagon which was at its time the most powerful WRX wagon that there had been until then (at 250bhp), made roughly the same torque as the 280bhp WRX saloon, and slightly lower in the revs. I will have to check that though. The wagon lumps also ran slighty higher compression ratios IIRC.

As far as tuning goes, assume you're starting from roughly the same point as a UK Turbo 2000 and you can't go far wrong. There are a couple of anomolies e.g. my MY98 wagon has a black STi4 intercooler with a WRX pipe. The WRX one had a smaller end tank.

5cby

early uk wagons had the TD05 fitted
mine has it and its a 1994 model

silent running

Yes they did. They switched to TD04 later on. I wasn't thinking of early classics with the weird turbo and intercooler layout really.

scoobyman95

you do not have to remap i have done mine and had it on a rolling road it is 350bhp and does not get fuel cut or detinet at all I have a standard ecu with a super chip it is fine but have fmic,induction kit, 440 injectors,and lots more

mafia_boyz

i swap my TD04 to a TD05... and i have not done a remap or anything other than a drop in K&N filter element and a de cat 3" exhaust... however i dun feel my ride has 350bhp.. why? and how to reach 300?

Sprint Chief

Scoobyman95,

Just clicked on your "view my scooby" - and that is one very nice looking scooby you have there!

However, on your list of mods it says you have an apexi pfc. This replaces the standard ecu and is (I presume) mapped to fit your mods. This is equivalent to a remap, and you would no longer have your stock ecu in situ (the pfc replaces it completely).

GazJenno

Look in the back of this month Japanese Performance mag and it even says in there you cannot just change the turbo's with out changing the ECU/Map