Random Boost Spike

[adamh]

Hi all,

I've just fitted an Apexi induction kit and Hks ssqv and seem to have a problem with boost control. It was running 1 bar(chipped Ecu) but now it's sometimes running 0.9 bar or it's sometimes spiking up to 1.4 bar.

Has anybody got any ideas whats happening with it ?

Cheers

Adam

[Big 'D']

Hi all,

I've just fitted an Apexi induction kit and Hks ssqv and seem to have a problem with boost control. It was running 1 bar(chipped Ecu) but now it's sometimes running 0.9 bar or it's sometimes spiking up to 1.4 bar.

Has anybody got any ideas whats happening with it ?

Cheers

Adam

What year of scoob have you got?

Cheers Iain

[Big 'D']

Ok I just found a pic of your car, nice green by the way

Assuming that you have just used the same pipe as what the std recirc DV used for the SSQV I will say its not that, what I do think it might be is to do with the boost solenoid pipework, if you have a 3 port boost solenoid fitted where does the very bottom hose go to? Also it should have a restrictor pill in it.

Cheers Iain

[adamh]

Ok I just found a pic of your car, nice green by the way

Assuming that you have just used the same pipe as what the std recirc DV used for the SSQV I will say its not that, what I do think it might be is to do with the boost solenoid pipework, if you have a 3 port boost solenoid fitted where does the very bottom hose go to? Also it should have a restrictor pill in it.

Cheers Iain

Hiya Iain,

I've connected the bottom hose of the boost solenoid via a t-piece into the hose that comes from the induction system and goes to the charcoal cannister. It still has the restricter pill fitted.

I've got a theory tho ............. When i first installed the chip and boost gauge the car was running 0.7 bar. I figured the actuator spring was a bit worn so i tightened the arm a couple of turns until it ran 1 bar. I'm wondering now that if the plastic recirc valve was leaking boost and i tightened the arm to compensate and new valve isn't leaking boost, i'll need to loosen the actuator arm off. Does that sound likely to you ?

Lol Army green FTW

Cheers

Adam

[Big 'D']

Hiya Iain,

I've connected the bottom hose of the boost solenoid via a t-piece into the hose that comes from the induction system and goes to the charcoal cannister. It still has the restricter pill fitted.

I've got a theory tho ............. When i first installed the chip and boost gauge the car was running 0.7 bar. I figured the actuator spring was a bit worn so i tightened the arm a couple of turns until it ran 1 bar. I'm wondering now that if the plastic recirc valve was leaking boost and i tightened the arm to compensate and new valve isn't leaking boost, i'll need to loosen the actuator arm off. Does that sound likely to you ?

Lol Army green FTW

Cheers

Adam

Can you take a pic of your boost control pipework please, I think the charcoal canister should be fitted to the MAP sensor line via a t piece, the solenoid should only be connected to the turbo, the actuator and the intake nothing else.

If the boost spike is random it is not likely that it would be due to the wastegate actuator arm length or the old DV leaking as this would of had a uniform change on the boost ie it would always run higher or lower boost than it was before you fitted the parts.

[adamh]

Can you take a pic of your boost control pipework please, I think the charcoal canister should be fitted to the MAP sensor line via a t piece, the solenoid should only be connected to the turbo, the actuator and the intake nothing else.

If the boost spike is random it is not likely that it would be due to the wastegate actuator arm length or the old DV leaking as this would of had a uniform change on the boost ie it would always run higher or lower boost than it was before you fitted the parts.

Hmmph it seems to have decided to fixed itself . It's now boosting to 1.1 bar in every gear .

I'll take a photo of the pipework on my next days off work. Just so i know i've plumbed them in correctly.

Thanks alot

Adam

[Big 'D']

Hmmph it seems to have decided to fixed itself . It's now boosting to 1.1 bar in every gear .

I'll take a photo of the pipework on my next days off work. Just so i know i've plumbed them in correctly.

Thanks alot

Adam

Isnt that always the way , ok mate I will keep a look out for the pics.

Cheers Iain