Opinions please. Boost gauge shows that my '84 300Dt makes 7 or 8 pounds of boost at the 4,000 rpm/full load condition the manual calls for. I wanted to adjust the spring preload on the wastegate and bring boost up to about 12 psi but can't get that stupid cover off!

If I restrict the wastegate hose with a needle valve I can get the boost I want.

Question is...is restricting the flow to the wastegate accomplishing the same thing as adjusting the wastegate spring. Gauge says yes, but I'm just curious.

What do you guys think?

thanks -

Fred