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Boost Leak Between 3000 - 4000rpm

FOG35

By FOG35,
in Engines & Forced Induction

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FOG35

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As the title says, when i am accelerating between 3000 and 4000rpm the car makes a flutter noise and my boost gauge bounces back and forward. Its giving me the shits because on the highway the car sits around 3000rpm in 5th gear when going 100km/h. It only does it when i either reach factory boost setting 7psi or hold boost steady at any psi between 0 and 7 while rpm are 3000 to 4000.

My question is why does it only do it between 3000 - 4000rpm?

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https://www.sau.com.au/forums/topic/107414-boost-leak-between-3000-4000rpm/
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paulr33 Grand Master

paulr33

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this has been covered a few times, it sounds like some light compressor surge

where did the hiflow come from? do a search on compressor surge / highflow and you should find some answers. with a good ecu you can tune around it as a workaround

FOG35 Collaborator

FOG35

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thanks for the replies. I have checked the bov and all vac lines. It still flutters around 3000-4000rpm in every gear. Before 3000rpm it holds boost fine and after 4000rpm it holds boost fine. I think the car might need a tune, who on the southside of brisbane know their rb20's.

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