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Author Question about dump valves..
Sly_SRi
Premium Member

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Registered: 9th Apr 04
Location: Reading, UK Drives: Corsa C
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2nd May 12 at 09:29   View Garage View User's Profile U2U Member Reply With Quote
I have one currently fitted but I'm having issues on half throttle where the boost will just drop off and won't allow me to accelerate progressively.

So I'm planning on removing the dump valve as I've heard they can cause issues, but are they needed on tuned turbo cars? Or will it be fine without one?

I'm kinda new to this whole turbo lark!

Thanks

Corsa C Z20Let

Black Sleeper Turbo Project
CORSA NUT
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Registered: 3rd Aug 01
Location: Wirral
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2nd May 12 at 09:32   View User's Profile U2U Member Reply With Quote
If its a Bailey like my old one they are prone to sticking. Bit of WD40 in the spring/shaft and see if that helps.
CORSA NUT
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Registered: 3rd Aug 01
Location: Wirral
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2nd May 12 at 09:33   View User's Profile U2U Member Reply With Quote
Also sounds doesn't sound like a DV problem to me....
BarnshaW
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Registered: 25th Oct 06
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2nd May 12 at 09:38   View User's Profile U2U Member Reply With Quote
check the spring rating, might also be as above getting stuck.

personally i removed mine and blanked it off, sounds much better and throttle response is night and day now.

or stick a standard recirculation valve on, whichever you do id suggest getting the map checked after as it may alter fuelling.
Sly_SRi
Premium Member

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Registered: 9th Apr 04
Location: Reading, UK Drives: Corsa C
User status: Offline
2nd May 12 at 09:39   View Garage View User's Profile U2U Member Reply With Quote
And am I right in thinking there is some sort of factory fitted dump valve/recirc valve on the side of the turbo?

Corsa C Z20Let

Black Sleeper Turbo Project
ed
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Registered: 10th Sep 03
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2nd May 12 at 13:24   View User's Profile U2U Member Reply With Quote
Z20LET's have a recirculating valve fitted already don't they? (So they don't need an atmospheric which I guess is what you've fitted).

 
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