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A 3bar reg on an 86 shouldn't be holding you back and will certainly support 15psi for short bursts. A common misconception is that you need more fuel to boost higher or to sustain longer because the OE system is not giving you enough - at the moderate boost levels you want under fueling will not be an issue. Boost will be limited by the APC doing it's job ( at high revs) and heat generated in the cylinders by forced induction.
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