YorkshireSimon

Taking delivery of the STi 7 this coming Friday and removing bits and bobs today. On removal of the EVC 4 boost controller and having taken the car out for a quick run, 0.5 bar boost was the most I could hit???

Pretty sure I have got the boost solenoid pipes and the Turbo/Actuator pipes connected right. Could my problem be anything to do with the restrictors and their locations?

Would obviously like to get the car back to something like standard boost before I take the car back to the dealer on Friday.

Any help would be most appreciated.

Cheers

Simon

dmel

Is this the pressure of your wastegate actuator? If yes, maybe your solenoid is not working. Put the ECU on test mode and check if it clicking.

YorkshireSimon

Cheers, dark now so will try this in the light tomorrow. As the stock solenoid has not been used for a few months, maybe your right...

Cheers

Simon

john banks

There is a restrictor in the pipe that comes off the turbo nipple outlet before the T-piece which then goes off to the solenoid off the side port, and the straight ahead continues to the actuator. If the restrictor is missing OR the solenoid is not working as above you will get the boost you are getting now. More likely human error rather than component failure - it is tricky to remember how it went together after a while.

[Edited by john banks - 3/3/2002 6:51:11 PM]

Trout...

If the restrictor is missing it won't limit your boost to 0.5bar - however the boost will rise much more slowly than normal.

0.5 bar on a standard car sounds like the wastegate crack pressure which tells me the solenoid is not working or is not connected correctly!

Trout

john banks

I get 8 PSI on my car with no restrictor just the same as I would with the solenoid at 0% duty cycle - both give you wastegate spring pressure regulation of boost? Or have I missed something?

YorkshireSimon

Cheers guys

John, yes there is a restrictor in the pipe from the turbo to the T piece, there is also one coming out of the T to the solenoid.

Didn't mention that the last week or so, car as sounded like someone blowing over a bottle top, thought this was a possible problem with the BOV, but as boost never dropped and performance didn't drop, have just left it, now though with the EVC out, boost down. Don't know if the above is related.

Simon

Trout...

The boost pressure will rise very slowly - just like putting in a bigger restrictor or larger boost pipes. It should not give 0% WG duty cycle.

Why do you think removing the restrictor will stop you creating boost?


Simon,

bottle top noise is a classic BOV problem - check it out.


Trout

[Edited by Trout - 3/3/2002 7:10:41 PM]

[Edited by Trout - 3/3/2002 7:11:42 PM]

YorkshireSimon

And yes, you're right, it is hard to remember how to put it back together.

I can live with it until the car goes in Friday, but would be nice to get it back to normal for the dealer. I have the car going in the Scoobymania on Thursday for the Exhaust putting back to standard and the AP's taking off. If I have not resolved it by then, I will see if they can fix at the same time.

Than again, 4 days without decent boost will be a cr4p way to end my time with my luvley motor...

Simon

YorkshireSimon

Trout

Yes, thought so, as I said though, was gonna leave it as is for the dealer to resolve when the car went back to them. The car has warranty so should be covered.

Cheers

Simon

john banks

What Model year Simon?

Trout I am still puzzled. I've fiddled with this quite a lot whilst making the EBC. With no restrictor on my car it goes up to 8 PSI in the time it would normally take to reach full boost - so well under a second and then it just sits there - NEVER goes higher. A larger/no restrictor, or no duty cycle all present most of the boost from the turbo outlet to the wastegate resulting in equilibrium depending on only wastegate spring. With no restrictor on my car there is just not enough flow through the solenoid even at 65% solenoid duty cycle to give you much boost above 8 PSI. Maybe different model years are different?

YorkshireSimon

MY00 UK car...

john banks

"there is also one coming out of the T to the solenoid" I have never found one on my MY00. That might be the culprit? Where did it come from? AFAIK on MY00 there is only one restrictor.

YorkshireSimon

interesting then... This particular one was stuck in the bottom part of the T on the T piece, not in the pipe. Kind of sits in the plastic T. Does that sound right?

john banks

No it doesn't sound like mine at all. I wish I had a camera as I have my T-piece and hose right here in my hand.



The only restrictor on mine and his is the one shown.

This is from Harry Boy's site for a MY00 as well.

http://www.geocities.com/harryboy_scooby/ go to the Dawes section.

john banks

Have emailed the pic to you as it sometimes does not display properly.

YorkshireSimon

As mentioned in email, many thanks to John for his advice. Got the job done this lunchtime.

Turned out to be one to many restrictors in the pipes, or in the T bit that goes to the solenoid.

Thanks to Trout as well for your input.

Won't get blown away now like I did this morning by the diesel powered Merc. Ouch, that hurt like hell.....

Cheers guys..


Simon