B series boost guru's, I need your help.


Crouchy

Crouchy

Member
Joined
Apr 27, 2012
Messages
76
Hello.
So it seems since I've decided to sell my car it now wants to break, probably my fault for not driving it in a long time.
My issue is, I'm lacking boost. A while ago my low boost setting on my boost controller stopped working, I'm thinking this maybe linked. (Greddy profec b spec 2)

I've changed my actuator to a forge one because it seemed as if my old one was seized, now I have less boost so maybe the old was alright lol!?
On a serious note I'm quite pissed off, I lost the love for this car a while ago and now it's just sitting there looking like some sort of expensive driveway ornament.

Can anyone give me any advise or has had this happen before?
Before I changed my actuator it was alright but I had nothing apart from (what felt like) the usual power I had when the boost controller is off, which is what I ran 99% of the time.
I think the next thing to look at is the boost control valve but air can flow though it I've checked but maybe the valve is seized?
Maybe the intercooler is blocked? Not letting enough air through to help create the pressure needed for the actuator to push the wastegate open?

Any help appreciated before I get angry and break it lol.

Max
 
do you know what the actuator Spring pressure is?
Does the car reach this pressur without the boost controller?

Can you hit highest setting on boost controller?
 
Sounds like you may need to adjust your actuator shaft to restore your normal boost with the controller off.

With the greddy boost controllers there is a small vac/boost line the goes to the controller with a small valve/filter in it, worth checking this is not blocked or leaking
 
jesse888 said:
do you know what the actuator Spring pressure is?
Does the car reach this pressur without the boost controller?

Can you hit highest setting on boost controller?
Click to expand...

17-20 psi rated.
Haven't tried it without the boost controller, I take you mean bypassing the valve?
I Max out at around 0.5 is the highest I've seen on the gauge.

robthedoc said:
Do you have a buyer?
Click to expand...

Nope took the advert down until it's all sorted.

b16 mini said:
Sounds like you may need to adjust your actuator shaft to restore your normal boost with the controller off.

With the greddy boost controllers there is a small vac/boost line the goes to the controller with a small valve/filter in it, worth checking this is not blocked or leaking
Click to expand...

It's the same length as the old one but yeah It probably needs setting up, I was hopeful this would fix it and I could see how much is boosting and adjust it accordingly.
I've had both vac pipes off and air can pass through the valve (with the car off) not sure if it moves when powered up haven't tried it running.
 
So what was the original issue?
Wouldn't make more boost with the controller? So stuck on low boost all the time?
 
I know someone that would be interested in buying it as it is mate. Save you the hassle. Pm me if your interested. If not now worries.
 
jesse888 said:
So what was the original issue?
Wouldn't make more boost with the controller? So stuck on low boost all the time?
Click to expand...

The most boost I can get on any setting is 0.5 bar. Controller done nothing.

Maybe it's either the controller not opening the valve at all or i haven't got enough flow in my intercooler pipes to create enough pressure? Possible blocked intercooler? Just a though, quite unlikely I would have thought thoigh.
 
Ok.
So you swapped actuator and it's had no effect or?
No effect would cause me too think you've got a leak somewhere.
Quite a leak if your turbo can only reach 0.5bar.
 
jesse888 said:
Ok.
So you swapped actuator and it's had no effect or?
No effect would cause me too think you've got a leak somewhere.
Quite a leak if your turbo can only reach 0.5bar.
Click to expand...

Double yes. Suppose the next thing would be smoke test to check for leaks?
 
What boost pressure would it hit before with the boost controller turned off?
 
Try turning the controller off and see if you reach your 0.8bar.
I still think you've got a leak but for you not to manage anymore boost with the controller on could be boost solenoid playing up.
 
jesse888 said:
Try turning the controller off and see if you reach your 0.8bar.
I still think you've got a leak but for you not to manage anymore boost with the controller on could be boost solenoid playing up.
Click to expand...

Doesn't make any difference, 0.5 is maximum on any setting.
I think I'm going to smoke test it to check for leaks and then maybe try and new boost valve.
 
Update: bypassed the boost control valve and the fitted my old actuator, no difference.
Next step, MAP sensor?
And I will smoke test for leaks when I get the chance to use my mates smoke machine.
 
drop downpipe and check the penny valve isn't sticking open or something.
 
The valve that's attached to the actuator. If that's stuck open you won't make much boost
 
jesse888 said:
The valve that's attached to the actuator. If that's stuck open you won't make much boost
Click to expand...

Okay, will have to give that a check then, take it just need to operated the wastegate is if the actuator would make make sure it's opening the wastegate?
Because it's moves free as a nothing from the outside (where the actuator attaches)

I'm out of idea's now, just want to sort it out.
 
Yeah man if you disconnect the actuator from the turbo and you can operate the wastegate easily with your fingers then it should be ok.

If thats the case... might be worth pulling the turbo off and really checking it carefully for cracks in the exhaust housing. A mate of mine had a similar issue with a CT9 turbo on his Glanza, not making anything like the boost it should of, turned out there was a crack in the exhaust housing right across the wast gate opening.
 
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