Boost spike on change up

Hi,

My car is an '88 9000 Turbo 16, auto 'box. I've noticed that when accelerating hard, the boost gauge 'spikes' briefly as the car changes up. Not a lot, but enough to cause pinking.

It's my first auto, and my first Saab, so is this normal behaviour? Or should I be looking at a new dump valve (BOV)?

TIA, Alan

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Alan Cole
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