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Hi,

ive got a hr31 coupe with a rb20det nics engine

everything is standard except, cat back exhaust, air filter and boost guage

when i accelerate, the boost goes up to 0.9 bar, then drops down to 0.5-0.6 bar

boost kicks in at about 2500-3000rpm and the boost drops at about 3250-3500

what could it be?

ive been told it could be the wastegate

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https://www.sau.com.au/forums/topic/70487-boost-problem/
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