Full Boost then Low Boost?!

[TheCombover]

Sounds like I have my next upgrade sorted then!

Having boost for less than 2k rpm isn't much fun

[2mad]

Sounds like I have my next upgrade sorted then!

Having boost for less than 2k rpm isn't much fun

Yeah that doesnt sound fun


Keep us informed

[TheCombover]

Finally I got a replacement OEM BOV and its working. I'm not hearing the wooshing noise when I boost and it holds at 13psi nicely.
However...
It does not feel like its producing the full 13psi of boost
The boost pressure is there but the power isn't.

[2mad]

Finally I got a replacement OEM BOV and its working. I'm not hearing the wooshing noise when I boost and it holds at 13psi nicely.
However...
It does not feel like its producing the full 13psi of boost
The boost pressure is there but the power isn't.

Still might have a leak .. eg. the turbos pushing a very hot 20psi then because of the leak your getting 13psi .. bad for the turbo , bad for performance ... hope you see what im getting at ... had this problem it stresses the turbo and kills performance

[TheCombover]

Ahhh right so the turbo is basically working way too hard to produce a lot less boost? That could be why I see 13psi on my gauge but don't actually feel the power since the turbo is under strain?

[2mad]

That my theory .. its happened to me , my bov leaked like a siv .. coursing the problem

[TheCombover]

Might fiddle with the MBC a little and check the turbo and See if the car is kicking out any codes

[2mad]

Might fiddle with the MBC a little and check the turbo and See if the car is kicking out any codes

Good idea but remember a strest turbo will not through a code .

[TheCombover]

I'm going to take the intake hose off and have a little poke at the compressor wheel and pray there's no movement

[2mad]

I'm going to take the intake hose off and have a little poke at the compressor wheel and pray there's no movement

Great idea mate ... look for side to side and in and out .

[TheCombover]

Basically any unwanted movement also could a knackered knock sensor retard the timing and therefore stopping the car from producing that turbo oompf?

[2mad]

Basically any unwanted movement also could a knackered knock sensor retard the timing and therefore stopping the car from producing that turbo oompf?

Yes mate ,and knock sensor, i suggested this earlier , its not an easy problem to fix .


You can check a actuator movement by attaching a foot pump to it .

Ill post a vid if needed.

[TheCombover]

I'm running a stock downpipe so actuator shouldn't be a problem. Unless the actuator itself isn't doing its job properly?

[2mad]

I'm running a stock downpipe so actuator shouldn't be a problem. Unless the actuator itself isn't doing its job properly?

From your description off boost power seems to be the problem .. you said on boost its fine .


Like i said my car is pretty lame under 3.5k-rpm .. comes alive after that .

[TheCombover]

It's producing full boost perfectly. However the power isn't there. I remember the first time I drove it with 13psi. The difference was mad. Since I got the BOV sorted it doesn't have that boost kick anymore and the turbo whistle is very very loud. Which does indicate to me that there's a boost leak somewhere still

[2mad]

It's producing full boost perfectly. However the power isn't there. I remember the first time I drove it with 13psi. The difference was mad. Since I got the BOV sorted it doesn't have that boost kick anymore and the turbo whistle is very very loud. Which does indicate to me that there's a boost leak somewhere still

Yes sounds that way to me too .. check the bov (remove and blow in to it) and check for leaks mate .

And check codes if knock sensors goosed that would enplane it .

[Major combover]

Okey so, i checked for error codes. None at all!
Unless the knock sensor is causing the issue but the error is not coming up?
Did a quick check of the turbo, just took the intake pipe off and had a little poke with my fingers, there is no play in the shaft at all

soooooo.. im guessing that perhaps timing is out for some reason?

Orrrr there is an annoying boost leak after the turbo.. after the boost gauge since the gauge is reading full boost.

[TheCombover]

Finally got my new intercooler fitted, so far it seems like it has cured my boosting problem!

Must have been leaking from the intercooler

[2mad]

Ow good stuff !!!!