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Thread: Boost encrease

  1. #1
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    Default Boost encrease

    My boost guage shows me 1.4bar @3000rpm,second gear.decat,intercooler pipes,breather,vacoom hoses done.can anywone tell me if i can encrease the boost mechanically(without a remap)and should i?benefits and danger!?

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    Diesels make power from fuel, not air like on petrol cars. raising the boost may only cause you issues.

    Get a remap.

  3. #3
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Default

    Diesel make power by heating air to creat pressure and work a piston. Thus more air will give more pressure to work the piston and more power unless the temperature of the higher pressure air is signifficantly higher. You can increase the boost manually but it's not as simple as fitting a bleed valve because it has vacuum controlled variable angle nozzles, controlled via a solenoid valve by the ECU. Also you would experiance high boost spikes in all likely hood.

    If you have a remap to raise the boost, it is best to do so only at the lower end (below 3500-4000)to prevent over-speeding the turbo

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    Vehicle : Vectra

    Trim : Design

    Engine : 1.9CDTi

    Year : 2005

    Mileage : Lots

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    You can do something to the actuator on the turbo wastegate so it doesn't open quite as soon which will raise the pressure a little but do it too much you'll either blow off a pipe or put it into limp mode because the boost sensor will see too much pressure.

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    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

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    Actually, I don't think the 2.0DTI is a VNT. The 2.2DTI is listed as a GT1849V but I think the 2.0DTI is a GT1544S, which, has an internal waste gate. In that case, it may be pressure controlled rather than vacuum and a bleed valve could be effective. Take off the pipe line to the actuator and see if there is pressure in the line.

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    Vehicle : Vectra

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    Quote Originally Posted by nutron View Post
    Actually, I don't think the 2.0DTI is a VNT.
    Correct, out of the DTi's only the 2.2 has variable vanes.

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    Default

    Thank u guys. I will check if it is presure o vacuum as soon as i get home then we take it from thereif u dont mind

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    just checked mine today (2.0dti) and it's vacuum controlled
    i mean,there's vacuum in that tiny pipe line to the actuator

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    so what do we do next?

  10. #10
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

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    A bleed valve is no good then but you might be able to adjust the waste gate actuator.

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