Top end Turbo Flutter

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Top end Turbo Flutter

This is a discussion on Top end Turbo Flutter within the Veloster Turbo Discussions forums, part of the Veloster Turbo Forum category; So short back ground, the car has FMIC, Catless downpipe, street ISR exhaust, BTR BOOST SOLENOID, BTR Tune. I'm making about 22-23 lbs boost on ...

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Thread: Top end Turbo Flutter

  1. #1
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    fireskidd's Avatar
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    Mar 2016
    Great Mills, MD

    Top end Turbo Flutter

    So short back ground, the car has FMIC, Catless downpipe, street ISR exhaust, BTR BOOST SOLENOID, BTR Tune. I'm making about 22-23 lbs boost on the top end, but the car does sometimes make an audible flutter sound in time with boost fluctuation. Is this the car making too much boost for the stock wastegate to handle. Or is there possibly another problem.


  2. #2
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    MircFSC's Avatar
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    Apr 2017
    Maybe a boost/coupler leak somewhere?
    2014 A/T VT:

    Pierce Hi Flo Catless DP | 6EE Short Ram Intake (Gold Taped) | ORCP (Gold Taped) | ORHP | 3TBS | 60mm TB | XPVS | 75A Mounts | WGA Adjusted | Rigid Collars | Generic OCC | 6EE Fuel Line | XWEK | 160 T-stat | 120 psi rad cap | DW65c fuel pump| Splash of flex fuel | HKS 45XL | **RN-TUNED**

    1978 Datsun 280z - Stock

  3. #3
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    trdtoy's Avatar
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    Apr 2014
    North Carolina
    Can you log it? That would help a lot along with more info on when it does this.
    '15 Auto VT

    PB's with slips and video:

    60' ET 2.05
    1/8 ET 8.70
    1/8 MPH 85.68 MPH
    1/4 ET 13.421
    1/4 MPH 105.57 MPH

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  5. #4
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    DedMemBRaiNE's Avatar
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    Jul 2016
    I had a BTR tune and took it out for that reason. I put down just about the same amount of boost and I would see it jump around violently on my gauge and make terrible surging noises. They have the tunes set way too strong IMO...
    E9C900A and TooGqForYou like this.
    2016 DCT VT Tech Package
    Performance- HKS M40XL / Tork EBCS / SXTH 3.5 SRI / SXTH Fuel Line / XE 3TBS / 60mm Throttle Body / Coolant Bypass / SXTH FMIC / HKS SQV4 BOV / SECo BOV Solenoid / SXTH Catless Downpipe / Magnaflow Exhaust / PUP / Mishimoto Catch Can / ADD W1 Catch Can / Glowshift AFR • Boost • Oil Temperature Gauges
    Handling- Uniq Strut Bar / Pierce Rear Torsion Beam / Pierce Crossmember / Uniq Rigid Collars / GodSpeed Lowering Springs / Continental Extreme Contact DWS

  6. #5
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    E9C900A's Avatar
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    Dec 2016

    Top end Turbo Flutter

    On-throttle compressor surge (rattlesnake sound) is very bad for a turbo. It happens when pressure ratio is too high, caused by too much boost at a given RPM with insufficient airflow post-compressor.

    22-23 PSI in the upper RPM range is way too high without hardened internals and head studs.

    Which exact FMIC are you using?

    Can you capture a video with sound?
    Last edited by E9C900A; 04-23-2019 at 11:42 PM.

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