i have a mk2 fiesta XR2 with an escort RS Turbo engine in.

recently had it rolling roaded at 190bhp but the clutch was slipping like mad due to all the power, so fitted a paddle clutch, so hopefully should see more than that when i go back.

it was setup on 15psi and has a big front mount intercooler and is chipped running a stage 1 turbo.

now last nite i was driving and when it hit boost it would cut out for a asecond then id have control back. spoke to some ppl and they said its "overboosting"

what i want to know is what EXACTLY is this, and what are the causes...and how can i stop it?

i have a bleed vave to control boost.

thanks for any help

Ry xxl