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Thread: Dump Valve Info Please For Newbie

  
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    Dump Valve Info Please For Newbie

    Being a newbie with turbos, can some give me some advice please?

    I read this little paragraph on the regal website and it got me thinking

    On turbo charged cars, that have not got a dump valve fitted already, the dump valve makes a big difference. Pressure is forced in the opposite direction into the turbo when the throttle is released, this causes a compressor stall and the turbo stops spinning when changing gear, resulting in a delay in initial pick up. It has also been known to shatter the compressor turbo wheel when running high boost. By fitting a dump valve after the intercooler outlet and as close to the throttle body as possible, excess compressed air in the intake system and intercooler is relieved when the throttle is released.

    Can someone just confirm that the GSi already comes with a dump valve as standard please, as I dont want to find out the hard way when the turbo goes boom :shock:. If it does not have one, which one would be the best to go for and roughly how much will it cost fitted?

    If there is one as standard, is it any good and will it be reliable enough?

    Sorry for all the questions, but I just want to find all this out, as I want to be prepared

    Cheers

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    Hi

    The astra SRI Turbo ( the only one we get in OZ) has the same engine as the GSI i believe. The cars plump back valve is good if your not planing to do any mods to your car, its a closed circuit hence no loss of air at all. If you start playing around with the engine boost ect ect, then maybe you can start to think of changing the valve. Or simply you might just like to hear that psssssssttttt sound when changing gears

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    I dont plan on playing with the engine just yet, so it should be cool

    Thanks for the confirmation mate, it is much appreciated

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    Yes there is a recirculating DV as standard m8 , the bailey one is of better construction but i would say it improves performance over the standard DV .

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    The stnadard dump valve is situated on the side of the Turbo next to the aircon pump (if your looking at the turbo from the front it sits to the left hand side. There is a bracket with a sensor attached which has 3 allen key bolts holding it and a vaccum pipe in the middle.

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    There's a full fitting guide with pictures here

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