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Thread: All is not well after rolling road

  
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    Unhappy All is not well after rolling road

    As I suspected there is something wrong with my Gsi . Was rolling roaded at 198.7 Bhp and 265 torque. Operator commented that the boost was dropping down to 0.7 bar after 3200 rpm and that I was hugely overfueling. Said it was probably down to a boost leak, but could also be a dodgy actuator or wastegate. Anyone got any other suggestions ?

    mods are as follows

    EDS phase 2 software
    Courtenay FMIC
    Pre-cat
    Bastuck Full exhaust
    BMC CDA with veccy air feed

    Not a happy chappy

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    Check all pipework - some hoses could be split under pressure....

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    Have you got a boost gauge fitted, if so what the reading like, whats it feel like on the road?
    Astra Gsi Turbo... With a few choice mods

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    Check all your pipework for splits and loose connections. Also check all the vacuum hoses.

    You should also try swapping the AFM imo.

    Setting the actuator should really be left to a specialist - it's a difficult job to get right without the correct equipment.

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    mystery machine's Avatar
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    Quote Originally Posted by Scottyboy
    Setting the actuator should really be left to a specialist - it's a difficult job to get right without the correct equipment.
    not to mention costly when you start lunching pistons!
    needs sorting asap.

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    actuator should be set at 8psi and agree its a professional job dont take any chances might be worth checkng the 2 nuts on the actuator as mine have a habbit of loosening
    courtney stage 3 zafira,Mitsubishi evo geek mapped to 389 and 470 lb of torque

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    Cheers for the advise chaps. None of the hoses are split and appear to be on tight enough. My old man tells me I should cover all the hose connections with fairy liquid to tell for sure if i'm leaking from somewhere. Maybe a trip down to Regals is on the cards ....

    Would the chronic overfuelling be a result of the boost leak ? The AFM if working correctly would be monitoring the extra air coming in and adjust the fuelling to compensate would it not ?

    Is there any way I can check if the actuator has gone ?

    Cheers

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    A bit late but here are the graphs








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    If the boost is reduced and the ECU is fueling like hell, it could be going into a mode to protect the engine from meltdown. How efficient was the dyno cooling fan and what was the weather like on the day the dyno run was done. Turbo engines suffer with heat on dynos, if you get the intake temperatures too high the pistons will melt, although the ECU will do its best to reduce the temperature by overfuelling and reducing the turbo boost pressure.

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    I know what you mean but it wasn't a particularly hot day and the dyno fan was the size of a jet engine !

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