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Have a read here about the spec and what you can and what not to?.......http://forums.turbobricks.com/showthread.php?t=171576

I had the `89 model and when fitting the MBC to around 14/15psi it...

I think you can simply fit a Manual Boost Controller which overrides the standard boost setting on beast, which is set by the diaphragm device on the turbo. Dead simple to fit, BUT - get an...

Increase the turbo boost pressure, standard is 6-7psi so up it to 10-12psi. It will make a huge difference.

I'd be tempted to just fire some boost into it and enjoy it. If I breaks then fix it!

camshafts with overlap can give a lower reading,
Dave

What is the mileage on the car? Any history with it? Did you test with the engine warm or cold?

Compression ratio on the B230ET should be 9:1 so should be at least 132psi (simply multiplying...