Carl Bentley

Hi people.

Replaced my boost solenoid today and im getting fuel cut's when reaching 1.0 bar, a friend of mine tested his ecu in my car. it was a Z4 and the fuel cut didn't happen. He advised me to change my ECU and that should solve the problem!!

His he leading me down the correct path or is there something more serious in this issue??

Any help/suggestions will help.

Thanks

Carl

dean_gti

Depends on the year m8?, dont think 1 bar would hit fuel cut.






Runs off to check lol.

joz8968

iTrader: (13)

Fuel-cut for a std 1993 WRX's OEM ECU is 1.0bar, so that bears out (should maintain boost at 0.8bar if everything's working fine).

So your car's obviously overboosting for some reason...

myblackwrx

iTrader: (1)

Does the bottom hose have the restrictor pill in it?

My old 93 wrx ecu used to fuel cut a lot in the cold but when i changed to the Z4 it has never done it since

Carl Bentley

restrictor pill???

btw it has a TDO5 turbo fitted. Full 3" decat. When the Z4 ECU was fitted it ran 1.2 bar OK

myblackwrx

iTrader: (1)

it shouldn't run 1.2 bar unless the ecu has been modified or you have a boost controller and fuel cut defender.

There is a restrictor pill in the bottom hose of the boost solenoid i just mentioned it as most people don't know that there is one.

Carl Bentley

it dont run 1.2 bar on standard ECU it was the Mines Z4 what i put in that it ran 1.2 bar

joz8968

iTrader: (13)

Yeah but I think mbwrx was getting at the fact that a standard Z4 doesn't boost cut at 1.2 - it's a shade under 1.1 bar (15.65psi).

But now that you've mentioned Mines, that implies that the Z4 has a Mines chip in it doesn' it? ... which prob runs at 1.1bar and, therefore, boost cut at 1.2bar (limit of your MAP sensor).

This is all getting away from your original problem (i.e. that Mines 'control' ECU is not helping in this troubleshoot), in that, for some reason, you're overboosting on your OEM fitment ECU.

Carl Bentley

Yes.. and i would like to know why its overboosting and cutting fuel.. Since changing the boost solenoid which was foobard it was running @ 0.8 bar fine. But why after changing the solenoid its boosting past 1.0 bar ??

Jolly Green Monster

iTrader: (4)

if it was running 0.8bar fine why was the boost solenoid fubar?

the restrictor pill as mentioned is probably missing.. the bottom hose off the boost solenoid should have a small metal restrictor in it.. smaller than a pea with a hole drilled in it.

Mines ecu is a bad move imho.. who would name a tuning company after a bomb?
They have iirc no fuel cut and run way too much ignition and usually an explosion occurs..

Simon

Carl Bentley

It wouldn't boost at all, so replaced and now it does, but cuts @ 1.0bar

How do i find out if the metal restrictor is missing? (and how do i get a replacement restrictor)

The mines ecu worked well @ 1.2 bar but cut after that.

For some reason it just keeps on over boosting.

myblackwrx

iTrader: (1)

Didn't realise you had a Mines ecu hence my comment sorry

Boost Solenoid Plumbing shows where the restrictor should be if it is missing you can buy them from a dealer but i think it has to be certain size which idon't know

Jolly Green Monster

iTrader: (4)

did you use any different hose or just swap the boost solenoid?

also have you connected the top hose to compressor cover, middle to actuator and bottom to inlet (which is the pipe the restrictor needs to be in)?

Simon

Carl Bentley

Don't know, he changed it and i didn't take much notice.

Gonna get my halogen lamp and take a look

Carl Bentley

Here is the solenoid pipes

Carl Bentley

Is this how it should be??? Please ring 07939419962 if you have time atm to discuss the location

ImageShack - Image Hosting :: p3012082141xh1.jpg
Little pipe inside

]ImageShack® - Image Hosting
connected to here

ImageShack - Image Hosting :: p3012082142co2.jpg
Connected to top of solenoid

Carl Bentley

OK just took of the bendy pipe that goes to the air box.. It don't feel like there is anything inside of it.

I'm guessing if this restrictor goes in there the fuel cut off won't occur. ? ?

Jolly Green Monster

iTrader: (4)

first pic - that is just a connector adaptor from large to small pipe

last pic - the bottom pipe should connect into the pipe that goes to the inlet resonator with a restrictor in it.

there is a lot of horrible pipework in that engine bay.. copper pipe to blue silicone with no clips holding it on etc.. what is the brass item cable tied to the dump valve take off?

it could of course be be overboosting just because the weather is damn cold and damp air at the moment..

Simon

Jolly Green Monster

iTrader: (4)

yes

Carl Bentley

where can i get one from?

Carl Bentley

Its not a cable tie.. Just my crappy phone with my halogen lamp shining.. Its actually the blue pipe with a jubilee clip

joz8968

iTrader: (13)

Sorry, but that made me laugh .

But a fair point - as it reminds you of blowing up, explosions and stuff... Oh the irony of it!

Carl Bentley

Ok just rang the guy. He didn't change any pipe work. He said there's a wagon ECU in it, and thinks there was a problem before this and so they just stuck a standard ECU in to cure the 1.0 bar boost cut.

What can i do??? I'm confused

What bar does my turbo produce?? TD05

myblackwrx

iTrader: (1)

if they put a wagon ecu in it that's unsuitable as they were meant to run a TD04.
Your turbos boost is limited by the ecu and if the correct ecu is in place

WRX/STi Saloon ECU's 2C, U8, W6, W9 - As above, 11.47psi held to redline. Fuel-cut 14.57psi

Carl Bentley

All sorted. Lad who fixed knew what he was doing.. Have now got Z4 ECU and don't boost cut.

myblackwrx

iTrader: (1)

Good to hear