This isn't a new one as the problem has been there since the boost controller was fitted. Basically the boost rises as it should and currently peaks at about 15psi but after hitting peak it drops a couple of PSI and holds at 13.5 - 14, this was highlighted at the last RR day (with UJCC). I've played with the controller (greddy profec B spec II) for a long time and no matter what I do with the settings I can't get it to level out so I'm wondering if there could be something else I need to look at.

 

Any thoughts appreciated.

 

I've searched all round the site and can't come up with anything and the settings that others have are quite different to mine?!?!?!?!?!

 

I was hoping to take it to the RR day on Saturday if I can get it sorted.

Could be a small boost leak

Are you running stock turbo's? If you are then they could be running out of puff at 15psi when you are on hard accelaration for a long period, and they are settling at a psi they can cope with.