Boost Leak Between 3000 - 4000rpm

[FOG35]

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?

[sproosy]

I guess you have an R33 Wastegate acutator on the turbo as well if your getting 7PSI?

Have you checked all your IC pipes and clamps? What about your BOV?

Good luck dude!

[paulr33]

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]

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.

[FSTR32]

I had a similar prob and now im in the process of a rebuild....get a comp and leak down test....not saying im right....might be worth a look tho

[Cubes]

Compressor Surge...

Bummer.