Chris NottMonster Motorsport
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  1. #1
    Booth_S4's Avatar
    Riding on V8 power

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    Dump Valve or diverter valve....?

    Whats the difference between the above???

    Ive got a forge Diverter Valve fitted to my car.

    cheers

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  3. #2
    jojo's Avatar
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    Dump Valve dumps the excess boost pressure into the air, hence the Phssssst noise when you lift of the throttle on cars like Scooby's and Evo's. Diverter Valve dumps the excess air back into the intake, and Audi's need the Diverter Valve to run properly, or it confuses the ECU.



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  4. #3
    Booth_S4's Avatar
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    So can you have a dump valve and a diverter valve?

  5. #4
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    A diverter valve will generally be better than a dump valve.

    When the dump valve operates the excess boost in the inlet manifold caused by the throttle closing is vented to atmosphere, this is bad for two reasons, firstly the turbo has just done all that work and you are ditching it into the atmosphere nad its better to use some of it by adding it back to the compressor inlt. Secondly, the MAF sensor has measured fuel for that air, so if it just disapears the ECU is lost as to how much air is in the inlet system and gets the fueling wrong. Not good.

    The diverter valve just moves the air from after the turbo to before the turbo, therebuy not confusing the MAF sensor.

    I hope that made sense....

  6. #5
    Booth_S4's Avatar
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    yeah sort of! im new to all this turbo business, only ever had N/A cars before. Ah well you live and learn as they say! thanks though

  7. #6
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    No probs.

    For turbo learning have a little look here:

    http://www.turbobygarrett.com/turbob...ch_center.html

  8. #7
    Adams3's Avatar
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    Quote Originally Posted by Booth_S3
    So can you have a dump valve and a diverter valve?
    No you can have only one at a time.

    Ive tried running both and the diverter valve diverts before the dump valve can operate!!

    Therefore pointless having the dump valve!!


    1999 AUDI S3 | AMD STAGE 2 REMAP | MILTEK CAT BACK EXHAUST | VIPER DIVERTER VALVE | EBC TURBO GROOVE DISCS | RED STUFF CERAMIC PADS | 18" RS6 REPLICA ALLOYS | ANDYMAC 'BOSE' UPGRADE.

  9. #8
    Booth_S4's Avatar
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    nice one adam! im guessing diverter valve is better from whats been said then

  10. #9
    Adams3's Avatar
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    Yep diverter valve is the way to go, and from the sounds of it you already have the best. Forge!!!


    1999 AUDI S3 | AMD STAGE 2 REMAP | MILTEK CAT BACK EXHAUST | VIPER DIVERTER VALVE | EBC TURBO GROOVE DISCS | RED STUFF CERAMIC PADS | 18" RS6 REPLICA ALLOYS | ANDYMAC 'BOSE' UPGRADE.

 

 

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