Isn't this the job of a wastegate?

I put a manual wastegate controller on my car because the spring was getting soft and this held it closed until a certain dialed-in boost pressure was reached. My turbo spools up a little quicker as a result...

The stock Garrett I'm sure is good for 2 bar...easy. If only I could deliver as much fuel as is needed for that...

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Cheers!
Scott McPhee

1987 300D