I have a '88 ERST with a problem.

Boost is fluctuating and drops off about 0.15/0.20 bar.

The AMAL valve is acting up again (replaced it once already about 2 years ago) but i don't want to replace it again as it costs about 70 euro/50 pounds.

I thought the actuator spring was a bit dodgy also.

I had a new -31 actuator lying about so I put that on.
I disconnected the AMAL valve (just straight on the turbo now)

It's running 0.45 bar constantly now but the factory setting is 0.45 to 0.55 bar so I need to adjust it some more.

HERE'S THE QUESTION!!

What is the boost limit on a standard ECU without it cutting out?

I want to dial in as much boost as possible now as I'm now running without overboost control