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Thread: dump valve

  1. #1
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    Default dump valve

    hi all has any 1 got a dump valve on their 1.9 sri cdti if how do i fit them any pics or vids thanks stan

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    Vehicle : Vauxhall Astra-J

    Trim : Elite

    Engine : 2.0 CDTi

    Year : 2013

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    Dump valves don't won't on diesels.

    That aside, do you really want people pointing fingers at you, laughing, and doing Nescafe coffee hand signals?

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    Regular Member Rebellion8878's Avatar
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    I believe it has to be done somewhere else than where you would do it normally on a petrol turbo, but have to agree with above does sound silly. Don't know if you saw top gear the other night but that Audi RS4 with it dropping a small amount of fuel in the exhaust system when changing gear did sound good.

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    Vehicle : Vectra

    Trim : VXR

    Engine : 2.8 T V6

    Year : 2008

    Mileage : 62000

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    The guys above are right.. Dump valves on a diesel work differently to those on a petrol. Turbo petrols have a butterfly valve which stops the air entering into the engine when the foot is lifted from the throttle.. To release the air still being drawn in by the turbo as it ceases to spin, the dump valve releases this to the atmosphere (hence the "whoosh" noise). Diesels don't have this valve as they can (and as standard do) run air rich, so the extra air entering the engine after the foot is lifted from the throttle due to the turbo continuing to draw in air as it ceases to spin, doesn't affect the performance of the engine.. To an extent anyway.. If the build up of air is too high that it would cause the car to stall, the air is usually dumped into the engine manifold, which is why you still hear a tiny and pathetic "whoosh" is some diesels!


    At least.. This is my understanding of the mechanics of petrol and diesel turbos


    Kits can be bought on eBay though.. Most of these are basically "fake" dump valves that are electronically triggered to make an atmospheric air dump when you lift your foot from the throttle.. Rather than responding to the pressure at the dump valve.. Well.. Valve.

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