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Thread: Still no overboost on Phase 2 Z20LET :(

  
  1. #1
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    coupez's Avatar
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    Still no overboost on Phase 2 Z20LET :(

    Hi,

    I have a full stage 2 Astra Coupe, and I've had this exact same issue before where the car wouldn't overboost over 0.9bar - and in that instance I got the DV and BCS replaced and all was good again, the car was overboosting 1.2/1.3bar.

    But once again the problem returned! So I recently replaced the DV with a new OEM unit and also swapped out the BCS with another test unit from a turbo that came off a friends car after he went the VXR upgrade route.

    But still the car won't overboost, it only boosts 0.9bar at full throttle in 3rd and quickly drops off to about 0.4bar. This exact map use to over boost 1.2/1.3bar with ease.

    Now I have had 2 different BCS's in the car to test which made no difference, could both of them be faulty units? Or should I be looking elsewhere, I have gone through the car for any vacuum leaks over and and over again and can't find any.

    Could there be a communication problem between the actual BCS and the ECU maybe? I'm running out of ideas and really need to sort this issue!

    Please anyone! Thanks in advance!

  2. #2
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    Dan@msx's Avatar
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    i would advise contacting the people that Mapped the car for you, maybe they can advise...
    No longer GSi power
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  3. #3
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    i have, and they have no idea, its not software related, that's been proven and also even when the car was flashed back to stock, it only boosts 0.4bar and just holds there..no overboost...

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    Sound's like a weak actuator mate, suprised it wasn't the first thing that was looked at TBH.
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  5. #5
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    apparently it was checked out and it opens and closes like it should? but i mean whats a actual good test - my guess would be to actually swap it out with a working unit and see if anything changes right?

  6. #6
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    (.)(.) bump?

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    swap the actuator over mate, and see how that works for you.
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