Boost issue, max 11psi

[RallyRS]

Hi,

I have a old school 1989 Legacy RS. I have got a heap of Eprom chips which tune the car differently.

I have 14psi, 17psi and 21psi chips. That is what written on the chip anyway, I didn't program them.

Anyway no matter what chip I put in the psi only over reaches 11psi (normally 10psi). If I flick the switch back to standard ecu, it runs about 6-7psi.

Why is it peaking at 11psi?
Is it a turbo problem? I have vf8 (wastegate spring tension???)
Is it a fuel cut problem?
Is it just badly tuned eprom chips?
Plumback BOV not holding pressure?

Many questions!

I hope someone may be able to help!

Cheers
Hayden

[RallyRS]

Someone please help!

Any crazy idea

I have given some examples of what I think might be wrong but Im not mechanic and have no idea! Just catch words I pick up.

[dzx]

unplug the wastegate and see if that changes anything. I'd definately watch the boost while doing it tho.