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Thread: Can u lose power with a dump valve 2.0t

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    Default Can u lose power with a dump valve 2.0t

    As above going to fit mine next week
    Seen a few posts were it says go into limp and u can lose power? Surely not with a decent quality dump valve like a Bailey etc

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    Regular Member Jezzy's Avatar
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    If you're going to disable or bypass the factory-fit one, then yes, the car will be slower. The standard one allows the turbo to keep spinning even when you take your foot off the accelerator, thereby reducing spool-up time and lag. An after market dump valve won't achieve that.

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    My car had an aftermarket dump valve fitted when i bought it..soon as i bought the car i got a BSR stage 1 remap..

    How can i check if the valves affecting performance

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    unless you change gear reeeeaaaallly slowly a i think the power loss will be so small you wont notice , you will however feel the woosh of the boost kicking in a bit more than before

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    The turbo spins at well over 100,000 RPM on full boost - the speed of your gear change isn't going to diminish turbo lag caused by the turbo having to regain that momentum.

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    Is that one of the reasons why the revs dont drop too quick either in between gear change?

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    Can't see any power loss if it's holding boost with a dump valve

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    Regular Member Jezzy's Avatar
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    Quote Originally Posted by tomo41 View Post
    Can't see any power loss if it's holding boost with a dump valve
    The clue is in your sentence: "holding" and "dump" are complete opposites. Dump valves dump the boost into the atmosphere, so the engine certainly won't be "holding" the boost with an aftermarket dump valve.

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    Regular Member Jezzy's Avatar
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    Quote Originally Posted by philgst View Post
    Is that one of the reasons why the revs dont drop too quick either in between gear change?
    No, with the factory setup on the Z20NET the engine can drop revs whilst the turbo doesn't, as the boost keeps the turbo spinning whilst bypassing the cylinders.

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    Quote Originally Posted by Jezzy View Post
    The clue is in your sentence: "holding" and "dump" are complete opposites. Dump valves dump the boost into the atmosphere, so the engine certainly won't be "holding" the boost with an aftermarket dump valve.
    I meant if it's holding boost while on the gas it can't lose power surely then dump it then back on

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