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Turbo under powering?

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  • Turbo under powering?

    Hi guys just a quick one I own a 2008 zafira 2.0 design turbo. Which is running a 2.5” straight through exhaust which is also decatted the precat. Also has a vxr turbo fitted with new core plus vxr injectors @ wastegate.
    anyway went into the garage today to have the oil return and sump gaskets replaced plus new oil and filter. Whilst there had 3 runs on the dyno. Results 206, 209 & 206 bhp runs. Been told it’s holding back on boost and the turbo is over working. Possibly faults vacuum pipes are too small or the recirculation valve Is faulty. Is this standard or could it be anything else?

  • #2
    Could be a weak actuator
    2009 Astra H Vxr arden blue uprated gearbox endcase with bigger bearings, 3" cobra catback non res with toyosport 2.5 double decat, mtc crossover delete and tophat

    Planning to go stage 3/3.5 eventually


    • #3
      Wouldn't it need mapping to make more than 200?
      Vectra VXR estate 07