Bob, did you get my email.

Stuart.

 

Jeez Bob, talk about knowing your stuff.

MAFFA

 

Right i'm gonna look for that restrictor thingy. There are three pipes coming off the solenoid, two of which are at the bottom. Should the restrictor be in the one at the very bottom that exits straight down or in the one that exits from the side?

MAFFA

 

Very bottom pipe ...... is where the restrictor is.
The other end of this pipe connects to the induction expansion box (the big black thing)

 

Cheers m8 will look tomorrow.

 

Thanks for the post boys, I just put a scoobymania decat on my P1 and had bad overboost in 3rd and 4th (never got to 5th!).

I took part of the thread to my local dealer (as they didn't know what I was talking about) they showed me where the restrictor was, but they knew nothing about drilling it.

So I've bought a set of drills from 0.8 to 1.2 in 0.1mm steps, the old size was 0.8, it's now 1.0 and it seems to have solved all my problems!!

Thanks again all!!

 

I've just checked on mine & the restrictor is in the pipe so that's not it [img]images/smilies/mad.gif[/img]

Now let me get this right, to cure the problem on a UK MY95 i'm to get a smaller restrictor & not drill the hole larger?? Am I right??

MAFFA

 

To quote Bob :

Your car has a 2.0mm restrictor fitted into the pipe that exits the bottom of the solenoid, pull the pipe off the solenoid and check, it may heve been removed, if so thats your problem. Go to your dealer and get it replaced, this will solve the problem. If its there you need to reduce the size of the restrictor hole to lower overboost.

 

Cheers m8 I should really read my own thread more than once

 

Maffa

Sorry have been offline for a while. Guess our local dealer gave you my name - they fitted this valve for me on my MY00 to cure an overboost problem, and have just asked me for the details to try curing a similar problem on an EVO!

The valve is the one John Banks used, and I see he's already posted the details earlier in this thread. Makes adjusting the boost very easy, esp. if you have a SelectMonitor plugged in at the same time.

Good luck mate

Dave

 

Getting a bit p1$$ed off with it now coz I can't figure out what is wrong.

The car is fine when it's cold but when it gets hot the engine just keeps cutting out at between 4 & 5k everytime I boot it. It did it a while ago so I changed the sparkplugs which cured it. Since then i've added a downpipe & a K&N induction & the problem has returned. If I boot it the engine just goes putt, putt, putt & quite often ends with a loud bang (sometimes flames). It can sometimes make overtaking a bit hairy!!!!! I've cleaned the wastegate which hasn't cured it but as the engine just cuts out & the revs drop from 4-5k to zero & back again i've been told that it may be overboost. On the rolling road it was running at 1.1bar which admittedly is very high for a UK MY95 but could it have this effect? If so can it be cured easily? I've checked the coil packs & there's nothing wrong with them.

I did notice as well that the revs pick up incredibly quickly, but this could be due to the large amount of boost. Also if the engine isn't too hot & this hasn't started happening yet I can't get my car past 6k on the rev counter without it cutting out quite rapidly (not like hitting the rev limiter). This I find very strange as my redline doesn't start until 7k.

It really feels as though the engine just temporarily gets suffocated & gets no air but this can't be it!!!!!!!

Oh & I run on Optimax.

Any help for a cure would be greatly appreciated.

Thanks

MAFFA

[Edited by MAFFA - 1/6/2002 5:22:27 PM]

 

LOL, this sometimes feels like the blind helping the deaf I only know bits, and probably other bits than you do

No, cleaning the wastegate is not an issue, you did exactly what you had to do (connectors - pulsating solenoid etc)

The giant lolly is indeed the wastegate button. It's connected with a rod to the actual wastegate inside the turbo.

The MAF on a <MY99 can be cleaned with brake cleaner. But I would prefer someone else stepping in to give you the exact directions, as I have a later model car. The MAF is situated behind the air filter box (you can see the wires connected to it. I would assume liberally spraying some brake cleaner on it should do the trick.

Shame search is off, because there are a limited number of reasons why you would see what you are seeing, and my memory is, erm... well, you can find me in Muppet most of the time these days

Edited to say : I mean spray cleaner inside the thing, not on the connectors LOL.

[Edited by EvilBevel - 1/6/2002 6:09:58 PM]

 

I think there are two problems here. The 4-5krpm cut out sounds like overboost, which will be exacerbated by fitting a downpipe and induction kit - basically the turbo boost is rising faster than the ECU can counteract it and when it hits a particular threshold it'll shut everything off. The sheer suction pressure of everything going through the system will suck some fuel through after the igntion's been cut, and hence the BANG when the fuel burns in the exhaust - i.e. it back-fires. You need a better boost controller or have it remapped.

As for not being able to go above 6krpm when cold - well, firstly you shouldn't be revving this high when cold anyway as the oil's cold and you'll get a massively increased rate of engine wear. Secondly, it sounds like something's unhappy in this state - perhaps a sensor or something. I have a vague feeling the MAF sensor doesn't work when cold, and the ECU works on a fixed set of settings? Or am I talking rubbish Basically, the cure is to be more sympathetic to your car and be gentle when she's cold

Also, the Optimax shouldn't be a problem - it actually has enabled me to hold max power from 5500rpm to 6800rpm instead of around 6300rpm on SUL. But then I have a MY00 and others seem to have varied results with Optimax on older cars...

Cheers
Richard

[Edited by Bitten Hero - 1/6/2002 11:36:24 PM]

 

Quick thought/question:

Maffa, I see your car is a MY95? Is that true ? It makes a big difference to whether you actually need a bigger hole or a smaller hole IIRC!

Bitten :

PS: can you believe I read his post 4 times and still missed it ? Muppet



[Edited by EvilBevel - 1/7/2002 2:58:59 PM]

 

Went into Subaru today & they've come across this problem before but mainly on newer models as the restrictor is apparently wider on a MY95. What they would do is just replace a newer model one with a MY95 one & the problem would be cured. On the 95 however they weren't so sure what to do.

If Dave McCulloch reads this thread - They said that you found a nifty piece of pipework on the net for about £11.00 that cured it. Please can you let me know where I may find one???

Cheers

MAFFA

[Edited by MAFFA - 1/7/2002 9:59:31 PM]

 

[EDIT
Cross posted with Bob. Please note I have only ever said that this is what to do on a MY99/00 and have often pointed out that earlier model years are supposed to be different. "If it is like later cars you need to very slightly enlarge..." is what I said. The valve I am referring to has around a 3mm variable orifice so should be suitable. Trouble is Bob you experts are not always about and in the meantime we muddle through. No offence meant or taken your help is as always most appreciated and I learn loads from your posts.
]

This is what I was referring to in my other thread m8. Give em a ring and get a valve - they already had about 20 orders from others through the above thread. Don't ask the boy about boost control he has no idea - he sells pneumatics. Tell him "Subaru Impreza" and he'll soon be onto the game and laugh a bit.... Can't guarantee this will work on your MY but worth a try. If you don't know one end of a valve from the other get the dealer to do it with restrictors or this valve.

"Pipemore Scotland Limited
3 Crompton Road
Southfield Inducstrial estate
Glenrothes
Fife
KY6 2SF

Phone 01592 630633
Fax 01592 630623

I had 1/8"BSP(M) x 1/8" Hosetail 2 x £1.57 +VAT
Metalwork 1/8"BSP Flow regulator 1 x £7.37 +VAT

Hose Clips from Halfords - 10/13mm 2 packs of 2 about £1.30 each pack.

3.5mm inside diameter vacuum pipe from Falkland Performance centre.

The hosetails will fit the 3.5mm pipe or the original Subaru vacuum pipe. To save you cutting your original pipes I would recommend gettting some vacuum hose. I have struggled to find it from motor factors/Halfords etc. Falkland are the only place I have been able to find it up here and I have looked hard."


[Edited by john banks - 1/7/2002 11:53:54 PM]