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Weird turbo noise when holding rpm

Old 12-09-2018, 01:50 PM
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Weird turbo noise when holding rpm

If I am holding around 3k rpm in 3,4,5 I get a little tsss tsss noise whenever I hold the rpm with my foot almost like itís trying to get rid of boost, I can still boost and everything but it just seems weird. My cruise doesnít work so Iím not sure if itís just to do with me or if my turbo is going, itís the stock recirculating valve, only mods are full Hahn exhaust and a bad tune from previous owner.
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Old 12-12-2018, 08:32 PM
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do you have a big turbo? with my 257, if I hold boost at say 3k rpm for more then 5 seconds I get surge, which is your engine not being able to consume all the air the turbo is pushing so it goes back into the compressor blades....which is bad. yours sounds like its doing the same. kind of a flutter sound right? or is it a blow off sound? if its that's then ur bpv solenoid may be going out or ur boost solenoid. both can do that
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Old 12-13-2018, 08:46 AM
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Really could be a "bad" tune and recirc valve having a torn boot...you'll have to pull the BPV and see if the rubber boot is ok.
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Old 01-15-2019, 12:37 AM
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Originally Posted by tomj77 View Post
do you have a big turbo? with my 257, if I hold boost at say 3k rpm for more then 5 seconds I get surge, which is your engine not being able to consume all the air the turbo is pushing so it goes back into the compressor blades....which is bad. yours sounds like its doing the same. kind of a flutter sound right? or is it a blow off sound? if its that's then ur bpv solenoid may be going out or ur boost solenoid. both can do that
I have flutter when I let off, but this isnít a flutter noise itís like air leaking out of a hose, it only does it when I clear my engine light for a baro code so Iím thinking it has to do with the bpv, Iím going for a custom tune soon so if that doesnít fix it Iíll just get a forge bpv
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Old 01-15-2019, 12:38 AM
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Originally Posted by northvibe View Post
Really could be a "bad" tune and recirc valve having a torn boot...you'll have to pull the BPV and see if the rubber boot is ok.
I have the gms1 tune but the guy before me out stock maps sensors on for some reason, thatís what Iím meaning by ďbadĒ tune haha
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