ttaffyboy1978

Hi everyone, new to this so not sure if im even doing this right
I've got a 1994 impreza wrx import with a W6 ECU, car has a few mods like TD05 turbo, uprated fuel pump but not sure which one? HKS super powerflow induction kit, blitz boost control, blitz dump valve and full 3" decat with ninja backbox . The car was running at 0.9bar but after fitting induction kit went up to 1bar.
I know on a version 1 you cant remap ecu, can chip it though. does this boost sound normal for a W6 ecu with these mods? dont know if anything has been done to it. the guy i bought car off said it was about 300bhp, i dont think so some how. been looking at a chipped z4 on ebay and a k6 from a v2 sti. all the info i been reading on these are very conflicting and confusing. anyone suggest the chipped z4 or the sti k6?

Scott.T

iTrader: (2)

Boost creep will happen with the induction kit and 3" decat.
You may also hit the fuel cut safety limit if it peaks too high.

To control this you can reduce the size of the brass restrictor in the boost control solenoid return pipe, which normally returns to the large black plastic expansion box on the air intake.

This may of been removed as part of the induction kit, so check the boost control return hose is still there and still has the restrictor fitted (quite common fault is to remove hose or replace with silicon hose without the restrictor)

Standard boost for the early W6 ECU is 11.47psi (0.79 bar)

The above is all based on the car running ECU controlled boost and not boost controller controlled boost.

Chipped Z4 are OK depending onwho chipped it

The STi V2 6K ECU is the same map as the UK Prodrive chip and peaks at 13.64psi (0.94 bar) with a much better fuel and ignition map compared to the rather spikey W6.

FYI and your right it won't be 300BHP. you won't see this unless chipped/mapped to at least 1.15 - 1.2bar which is the absolute max for the standard 380cc injectors and Map sensor.

Oh....and the TD05 isn't a modification, it's standard........

ttaffyboy1978

oh! i thought a TD04 was standard as thats what was on my 2005 wrx, learn somit new every day. well my car already boosts at 1 bar so is there any point in changing my W6 ecu??

Scott.T

iTrader: (2)

Fuel map is better in later ECU.
I would also recommend you get fuelling and detonation check if running 1bar without any other adjustments.

marcevs72

iTrader: (5)

dont bother with the chipped ecu just get a z4 and get afr's checked.run a z4 on my 93 wrx with full decat system,walbro,induction and just over 270 bhp nice and safely.i had mines chipped z4 with manual boost controller on mine as well when i got it and was running well lean at top end so got rid straight away.

ttaffyboy1978

whats your take on the K6 then, some say its real good and others say its harsh?? i was told with my current mods i could get 300bhp with a K6.

marcevs72

iTrader: (5)

its a good standard ecu but thats for running sti spec and i think the sti has different turbo (might be wrong but thought sti had vf turbo not tdo5) 300 is also pushing it on standard injectors and slanty intercooler.i am happy running 270 nice and safe and waiting to have 2.1 stroker built to go for higher bhp nice and bulletproof but will be running simtek.

Scott.T

iTrader: (2)

It's 6K and not K6.
This can run on a WRX or UK Turbo and as mentioned above uses the same map as released to the UK as part of the UK model Prodrive ECU upgrade.

Similar map to the Z4 with a touch more boost (12.7psi raises to 13.64psi).

ttaffyboy1978

oops i meant 6K. Think ill just stick with my W6, it already boosts at 1 bar and i think to myself is there any point in it being any faster?? my wheels cant handle the power as it is, and not many cars iv come up against comes close to keeping up with me. could be my amazing driving though i just dont know.