External Wastegate spring preasure?

SYCLONE#1531

'MOFOFAST
Im interested in installing RPMs 38mm External wastegate on my crossover tube & removing my conv.. I will be running approx 18lbs with a manual boost controller. Not to sound dumb, but what spring preasure would I need to achieve 18 / 20 lbs boost.
 

ghettosled

SYTY SUPERSTORE
Re: External Wastegate spring preasure?

comes with various springs and adjust-ability from 5-14psi base.. from there you just crank up your manual knob till you reach the desired boost pressure.. Out of the box they come with 10-11psi, and i typically leave them there and use a boost controller to increase pressure.
 
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