scottlammas

HI EVERYONE OUT THERE IN SCOOBYLAND
I HAVE A LOW BOOST PROBLEM(6PSI)& CHANGED EVERYTHING APART FROM ECU.
IS THERE ANYONE OUT THERE WITH A ECU TO PLUG IN TO SEE IF CURES THIS ON GOING PROBLEM

David_Wallis

have you tried checking error codes?

scottlammas

No error codes??

Delboy2

Under the steering column there is the facility to reset and read ECU faults (By plugging the connectors together)

Read this :-
http://www.saxonfields.freeserve.co.uk/Scooby%20Page/ECU%20Diag%20Page.htm

scottlammas

HI DELBOY2
TRIED THE CONNECTORS UNDER THE COLUMN (NO FAULT CODES, ALSO BEEN CONNECTED TO SELECT MONITOR & THE LATER SCOOBY FAULT CODE READERS & GUESS WHAT -NO FAULT CODES-)

Delboy2

Do you know whether the car had been previously modified? Check to make sure the pipe from the 'nipple' on the turbo outlet goes to the 3 port solenoid in front of the drivers side suspension turret(Behind Airbox) The bottom of the solenoid should go back to the bottom of the black chamber between airbox and turbo, the remaining pipe should be connected to the turbo Actuator (Wastegate) Also in this pipe there should be a small restrictor.

Cheers

[Edited by Delboy2 - 11/25/2003 1:04:08 AM]

Scott.T

iTrader: (2)

On this MY the restrictor is in the pipe to the air intake expansion box. NOT the pipes to the Turbo or Actuator/Wastgate.

It sounds like the solenoid is stuck closed or the pipes from/to is are block with oil.

Stick your head under the bonnect and open the throttle by hand. As the throttle/butterfly comes of it's resting position the Boost Control Solenoid should start ticking (on drivers side strut top)

scooby@goole

scott.t, when the solenoid ticks, does this mean that it is blocked? or this is what it should do?

Scott.T

iTrader: (2)

Ticking is good.
Silence when throttle open is bad.

However, really loud ticking can also mean bad or that it's rubber mounting bushes are shot.

I have heard of some ECU failing in this area in particular the ealry one (which a W6 is). The Solenoid drive cicuit packs up altogether.... Solution = New ECU or a Dawes valve to by-pass the solenoid.

scooby@goole

CHEERS. mine ticks so thats ok. i heard that using bleed valves makes the car run lean. if not how do you no how much to open it by.

Scott.T

iTrader: (2)

If fitting a Dawes or a Bleed Valve then you really need to have a boost gauge fitted as a minimum.

The Standard W6 ECU boosts to 11.47psi, with fuel-cut set at 14.57psi.
You could run a Dawes set to 13psi without too much of a problem.

jonny gav

iTrader: (1)

i have a U8(240bhp from MY94 wrx) ecu here you can have for £50 + p&p

scottlammas

TESTED TO SEE IF BOOST SOLENOID TICKS WHEN LIFTING THE REVS (NO TICKING NOISE)

scottlammas

COME ON FOLKS THERE MUST BE A W6 ECU TO TRY?????????????

Scott.T

iTrader: (2)

Get a Z4 it's alot better and also boost to 12.7psi rather then 11.47psi.

Pavlo

Are you sure the solenoid is plumbed in correctly?

Top feed should go to the turbo compressor housing
Middle should go to the wastegate actuator
Bottom should do to the inlet resonator in the engine bay, and be fitted with small restrictor

Paul

scottlammas

The pipes have been checked(ok).Also been to Central Subaru & they cannot find whats wrong.Is it ok to fit a Z4 ecu as its a WRX-RA 93(i have been told they are different as it a 5th injector is this true)

Scott.T

iTrader: (2)

It has a fith injector yes but AFAIK it is not used on the road car.
I have fitted a Z4 in a 93WRX RA before and also mapped it to 16.5psi without any issue.

If it is really a WRX RA then the W6 ECU is the wrong one anyway. I think a 93 RA should have a W9.

There are no 'performance map' differences between a W6 and W9. Although the W9 is slightly newer with the Knock Correction maps in the usual/later location (W6 and U8 are earlier and have different map locations).

The fuel/ignition/boost maps between a W6 and W9 are identicle.
A Z4 is much better/smoother and gives more boost.

scottlammas

I have ordered my dawes device (arriving later this week)does this mean that if i get hold of a Z4 ecu i can set boost at 16psi or is that fuel cut off limit

Pavlo

fuel cut is 15.something (15.34?) psi on z4 which will spoil your fun.

Paul

scottlammas

15.34psi i would be well chuffed with that as it currently running at 6psi (very depressing) any idea on where i can find a Z4 & how much

Scott.T

iTrader: (2)

Put a post in 'Wanted' or get in touch with Grade A Subaru breakers or TownEnd Garage.

Don't let them bluff you with another ECU tho'. It's a Z4 you want not a W6, U8, 2C or W9

Certainly not a V5, V9 or 1C as these are from WRX Wagons

scottlammas

Thanks Scott the search has begun (what boost limit can i run safely with Z4 & dawes device)

Delboy2

Under 15.34psig as you will initiate fuel cut as Pavlo has said. Probably need to set it to about 14.5psig

scottlammas

ANYONE OUT THERE KNOW WHERE I CAN GET HOLD OF A Z4 ECU

scottlammas

located a Z4 ecu + fitted it this morning, goes very well now.Coming out of the casing are 3 wires,what are they for? i just had to remove the cover to see + found another circuit board on top of the EPROM.

Scott.T

iTrader: (2)

Take a piccie and we may be able to tell you what it is. Are there any markingd on it.

It may be a good map, it may be a Jap map which isn't good on UK fuel.

2 of the wires coming out of the ECU will go to location labelled 'J1' on the board. If you join these 2 wires together it will run the standard Z4 12.7psi map rather then the additional and at present un-known map.

scottlammas

Hi Scott
sent 2 pictures to you by email (attachments)