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BMW 3-Series (E90 E92) Forum
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Weird trumpetting noise
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07-30-2018, 06:58 PM | #1 |
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Weird trumpetting noise
I have a 2009 335i m/t and im hearing a really weird noise under WOT. It almost sounds like a deflating balloon/an elephant trumpeting and its driving me nuts. I do have a vrsf cp and BOV with an upgraded 7in fmic from vrsf as well as jb4 stage1 on the car currently.
Any help with where this noise may be coming from would be really helpful Thanks! |
07-31-2018, 12:33 PM | #2 |
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Typically the trumpet sound is a boost leak. Gotta check all the clamps on the intercooler, charge pipe etc. If you are stuck a leak or smoke test will help you figure out what needs tightening or replacing
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07-31-2018, 12:51 PM | #3 |
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Have you eaten at PF Chang's in the past 24 hours?
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07-31-2018, 12:58 PM | #4 |
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2011 335is DCT BQ Tuning / BMS CAI / VRSF kittyless DP's / Synapse BOV and charge pipe / 7" VRSF Race FMIC / Walbro 535 and 450 on BMP4 / E90 tune / Diff Brace / PR Coils / Relocation Inlets / DAW Stage3+ Turbos / MMP port injection / xHP Stage 3 / FPR and -6 fuel lines
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07-31-2018, 10:20 PM | #5 |
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Gotcha so I guess that’s probably why I’m way under target boost. During my 3rd gear pull I was almost off by 3-5 psi. Also my IAT was at like 136 even thought the outside temp was like 77 degrees. Would a boost leak explain the high iat values
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08-01-2018, 06:29 AM | #6 |
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Yes, it could affect IAT's because of inefficiency.
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2011 335is DCT BQ Tuning / BMS CAI / VRSF kittyless DP's / Synapse BOV and charge pipe / 7" VRSF Race FMIC / Walbro 535 and 450 on BMP4 / E90 tune / Diff Brace / PR Coils / Relocation Inlets / DAW Stage3+ Turbos / MMP port injection / xHP Stage 3 / FPR and -6 fuel lines
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02-22-2024, 08:29 PM | #7 |
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what ultimatley ended up causing the leak? Im going through something similar with an identical sound
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07 E92 335i 6MT coupe RWD
VRSF Chargpipe Tial BOV, VRSF 7.5" Comp IC, VRSF Catless DP, CSF Radiator, MHD Stage 2+ 93oct v10 |
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03-15-2024, 07:32 AM | #8 |
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It's a boost leak. You might not see it from just visual inspection because some of them happen at a certain PSI.
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2011 335is DCT BQ Tuning / BMS CAI / VRSF kittyless DP's / Synapse BOV and charge pipe / 7" VRSF Race FMIC / Walbro 535 and 450 on BMP4 / E90 tune / Diff Brace / PR Coils / Relocation Inlets / DAW Stage3+ Turbos / MMP port injection / xHP Stage 3 / FPR and -6 fuel lines
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