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Thread: VXR Turbo Problems - Please Help

  
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    Rich Gsi Turbo's Avatar
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    VXR Turbo Problems - Please Help

    Right I currently have no back box on car.
    Car is standard apart from,
    Pre-cat, 2.2 Airbox, and recent VXR Turbo.

    The problem i have is the car does no way pull like it used to with this new turbo.

    My boost gauge shows that it keeps boosting to 2.0bar which is 29psi (does not feel like more of a pull than my old turbo which was knacered and overboosted to 1.0 bar), and stays there for a very long time before it starts stuttering and missfire. If i want the normal 1bar i can only give the car half throttle.

    I have changed the actuator back to my old actuator and ensured that it was set to the very end- it does no difference.

    I have a dumpvalve fitted but no spacer on the OE valve on the turbo unit itself? should i try a spacer? or block it off?

    Could the No-Back box be a factor?
    lack of back pressure?
    could it be boost solenoid?
    any other ideas? it is seriously getting me down;

    thankyou

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    tim1547's Avatar
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    Your boosting to 2.0 bar 29psi??? Thats very high mate as im sure you know. Are you running a standard map? Who fitted the turbo? Sounds like you need to have the actuator set up properly and if it was me I'd get that done asap.
    Astra coupe turbo 280bhp-sold
    BMW E60 5 Series M Sport

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    Rich Gsi Turbo's Avatar
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    Vauxhall mechanic changed the turbo for me; in his own time;

    I spoke to regal to ask how much the IPF stage 1 was boosting and Karen said it shouldnt be much more than original;

    * she suggested checking for leaks in vacum? - how would i do this?
    * she suggested changing the VXR actuator back to original actuator which i did, and it still the same, even with actuator wound right down to very end.

    - Should i blank off the valve on the turbo? the black thing? put a spacer there? as im running a baileys dumpvalve!

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    Rich Gsi Turbo's Avatar
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    could it be a faulty BCS? should i try and swap the current one for my older 1 off the original turbo?

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    The Ecu should not allow that boost ever unless its mapped to do so, the map sensor should be seeing that and putting the car into limp mode. I would not drive untill the problem is sorted as you will end up cracking a ring land or killing rings from detonation, then its rebuild time.
    Take the car to someone who can read the sensor outputs with vagcom or similar, if you have to drive it keep completley off boost.

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    Rich Gsi Turbo's Avatar
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    could it be a faulty map sensor then? BCS would not allow too much boost then?

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