How do i fix: When turbo jerks car.
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This is a discussion on How do i fix: When turbo jerks car. within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Hello, i'm new to the site but I've been reading alot of threads and I can not find the answer ...

  1. #1
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    How do i fix: When turbo jerks car.

    Hello, i'm new to the site but I've been reading alot of threads and I can not find the answer to my problem. I recently bought a 2002 Subaru Wrx. It was dyno'd at 245whp and 240lbs of torque. The car has some modifications to it. Here is a list of them:
    2002 Subaru WRX
    124,XXX Miles on Chassis
    39,XXX Miles on Motor and Driveline (Motor replaced by Subaru w/ Paperwork)
    **Oil Changed every 3,500 Miles with Shell Rotella T6 5W-40 and Bosch 3310 Premium Filter**

    MODS:

    Engine-
    New Shortblock from Subaru replaced at 85,XXX miles
    COBB Accessport- Will be included in sale
    Full Invidia Turbo Back Exhaust
    All Exhaust Gaskets are Grimmspeed 3x Thick Gaskets
    Perrin 2.4" Turbo Inlet
    Deatschwerks DW200 Fuel Pump
    NGK 1 Step Colder Iridium Spark Plugs-Just Replaced
    STi TMIC
    STi Bypass Valve
    HPS Intercooler Couplers
    Extreme Turbo System-Couplers
    Cobb Short-Ram Air Intake
    Cobb Short-Ram Air Box
    CX Racing Radiator
    GrimmSpeed EBCS
    GrimmSpeed Catless Up Pipe
    ATI Triple Gauge Pod
    SMY Gauge Delete Cap
    AEM UEGO Air/Fuel Ratio Gauge
    STRI Boost Gauge
    Protuned on Mustang Dyno by STi Mikey 245/240
    AFR set to 10.9 at WOT and 14.4 at Idle
    Killer B Alternator Shroud

    Exterior/Interior/Suspension/Driveline-
    Full 07 WRX Driveline: 07 WRX Transmission, Center and Rear Diff, 07 WRX 4-POT 2-POT Brakes, 07 WRX axles, 07 WRX hubs- Castrol 75W-90 Transmission Fluid
    Hawk HP Race Pads- Tend to Squeak because they are heavy duty
    Dorman Wheel Locks
    Stoptech Cryo-Treated Rotors
    Tein S-Tech Springs
    TIC Rear End Kit: Rear Differential Bushings, Rear Outrigger Bushings
    Kartboy Short Shift Kit: Short Shifter and Front and Rear shifter stay Bushings
    Blox NeoChrome Shift Knob
    XXR 518 Wheels
    FastWRX Wheel hub adapter kit
    BFGoodrich Sport Comp 2-
    Painted WRX Side-skirts
    WRX OEM Front Lip Kit
    Wingless Trunk
    JDM STI Projector Headlights
    Hella Supertone Horns in Red
    WRX Front Plate Delete
    30% Tint On all Windows Except Windshield

    That was the list. My car pushes 19lbs of boost. Now, heres my problem.
    When the car hits around 15lbs of boost and still going up, the car kind of jerks excessively and it doesnt sound good. I was thinking it is either the spark plugs or i need bigger fuel injectors. I don't know if any of the modifications is doing it. I don't know what is doing it. Can someone tell me how to fix it?

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  3. #2
    Master Baiter EJ257's Avatar
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    You have any datalogs?
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning, LLC

    "Never trust anything that bleeds for a week and lives ..."

    UNYSOC

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    Quote Originally Posted by EJ257 View Post
    You have any datalogs?
    I have no idea.

  5. #4
    Master Baiter EJ257's Avatar
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    Quote Originally Posted by Pnanna16
    I have no idea.
    You would need to datalog the car for us to help you. How was the car tuned?
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning, LLC

    "Never trust anything that bleeds for a week and lives ..."

    UNYSOC

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