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dump valve
This is a discussion on dump valve within the Fabia I forums, part of the Skoda Model Discussion Area category; Guys - i need some advice! as some of you may know, I am getting a black Furby vrs in ...
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09-08-2004, 17:50
| #1 |
| Briskodian Join Date: Jul 2004 Location: midlands
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| dump valve Guys - i need some advice! as some of you may know, I am getting a black Furby vrs in a few weeks... but, I was wondering if I should fix a dump valve to it. I am totally new at this car moding up thingy bob, so is it worth buying one? Apparently there are two different types - a re circulating one, and a atmospheric one?  Few questions 1 - Are they easy to fit? 2 - Which of the two types makes that whooooshie noise? 3 - Does it use more diesel? 4 - Does it increase the performance? 5 - Is there a standard Skoda dump valve already fitted to a vrs? 6 - why do i ask so many questions? also i have heard of a waste gate fitted - what’s the difference? sorry to be so blonde, but I haven’t got a clue as you can tell! Last edited by paxton; 09-08-2004 at 18:16. |
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09-08-2004, 18:05
| #2 | |
| Briskodian  Join Date: Mar 2003 Location: Andover
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| Quote:
 1. Yes 2. Vent to atmosphere 4. No!!!  Chris
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09-08-2004, 19:21
| #3 |
| Briskodian  Join Date: Oct 2003 Location: Woking/Bolton Le Sands
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| Fab VRS doesn't have a dump valve if I remember right. It has some form of variable geometry blades in the turbo or something like that.
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09-08-2004, 19:42
| #4 | |
| Briskodian  Join Date: Jan 2004 Location: North East England
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| Quote:
And as for fitting a dump valve to a TDI.....................DO'NT DO IT! Completely pointless (IMO of course). Unless you like wasting money!
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09-08-2004, 19:59
| #5 |
| Cupra Bush King  Join Date: Sep 2003 Location: Newport Pagnell
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| You cant just fit a dump valve to a TDi, theres no inlet vacuum to opertate it. So it has to be a kit with an electric solenoid and or switch to operate it. Kits cost around £300 and are somewhat pointless as mentioned. £300 towards a remap/brakes/suspension would be a much better idea. |
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09-08-2004, 21:03
| #6 | |
| 130bhp  Join Date: Dec 2003 Location: Sheffield (UK)
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| too right!!!!
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09-08-2004, 22:20
| #7 |
| Briskodian Join Date: Jul 2004 Location: midlands
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| ok - stop shouting at me - told u i was a learner! found this - http://www.scoobyworld.co.uk/trolleyed Q. What is a dump-valve? All a dump-valve does is release boost pressure from the turbo when you let off the throttle; In a petrol car this is a good thing because when you cut the throttle back on a petrol it causes a backflow of air (vacuum) which can cause the turbo to stall (stop completely) or even worse start going backward. The dump valve releases the excess boost in the system and allows the turbo to continue spinning, this reduces the amount of time needed for it to spin up again next time it is needed (turbo lag). On a diesel engine there is no vacuum and hence no reason for the turbo to stall in the first place. A dump valve on a diesel does not increase performance. Where fitted a dump valve can be heard when you change gear or let off the throttle and is known for it's characteristic "whoosh" or "tish" noise. Q. Can I fit a dump-valve to my turbo-diesel? A. Yes you can fit a dump-valve but it will not increase performance. You will not see any increase in power or torque, but you may (but not normally) experience less turbo lag. Fitting a dump-valve is not recommended unless you know exactly what you are doing. There is no automatic or easy way to control boost release on a diesel due to the lack of vacuum in the inlet manifold. A diesel dump-valve needs to be controlled electronically and only a twin-piston valve can be used. A micro-switch is connected to the throttle control and vacuum from the brake system is used to open the dump valve via a solenoid connected to the brake vacuum hose. |
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09-08-2004, 22:26
| #8 |
| Mongreller  Join Date: Apr 2003 Location: Exeter / Devon
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| yeah - waste of dosh. Eibach dampers and springs costs less than that.
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