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Audio | Aqua Gleam | Brakes | Cleaning | Engine | Exhausts | Gauges | Lighting | Suspension | Styling | Wheels Home : Performance : Dump Valves - add some 'whoosh!' to your Scooby!
Welcome to the Dump Valves - add some 'whoosh!' to your Scooby! page.

What is a Dump Valve?

The function of a dump valve is to release un-used boost pressure when lifting off the throttle of a turbocharged car.

When accelerating the turbocharger produces boost (positive pressure) which is used to force feed the engine with large amounts of compressed air.

When you lift off the accelerator the throttle butterfly is closed and the boost has no escape route so it backs up through the intercooler and causes back pressure that tries to stop the turbo from spinning.

A dump valve ensures that every time you release the throttle the excess boost pressure will be released which means a significant reduction in turbo lag, contributing to faster pick- ups between gear changes.

There are two types of Dump Valve available - 'Recirculating' and 'Atmospheric' - which indicate how the excess back pressure is expelled.

The Impreza is already fitted with a recirculating dump valve, however this can be removed and a atmospheric dump valve installed to give a loud " woosh" sound when changing gear and a slight improvement in turbo lag.

Dump Valve - Bailey Motorsport Classic Impreza 1993-2000

£116.99 inc VAT

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Bailey Motorsport Twin piston Dump Valve for cars up to 2000.

Price includes valve & installation kit with all the necessary fitments.

Image shows valve plus fitting kit.

Customer Reviews

"Very easy to fit, took me 10 mins and I have no engine knowledge whatsoever. It makes a big difference on the pick up reduces,lag and sounds good" - Gareth (surname not supplied).

"Really easy to fit, sounds great, looks great!" - A. Mihailidis

"Easy to fit 12mm socket and a pair of pliers. took about 5 mins(no kidding). Sounds great, My scooby now has an evil streak" G.Murhead

"An excellent product at a great price. Simple to fit. Really gives your car that 'bad-boy' street racer swoosh sound when driving hard yet almost un-noticeable when taking it easy, the best of both worlds! I have also noticed it seems to regulate the turbo pressure- at least better than the OEM part anyway. If you fancy treating yourself, and your Scooby then i'd recommend one of these to all" Duncan (surname not supplied).

"Fantastic sound and more power. The 3,000 revs of the engine will never sound the same again.It brought my Scooby to life! Wicked and well worth the buy".
comments on scoobyworld: "Fast delivery, a good service. Best I have seen on the net so far" - M. Wagstaff

"Just fitted Baily dump valve how easy was that just the way we like our tweaks 10 mins job done off for the test drive...Sounds GREAT.
comments on scoobyworld: Good Service from scooby world keep it up lads" - A Harris

"oh my God! how impressed am I - Just fitted the bailey dump valve 2 my scooby, it sounds incredible, looks fantastic, its turned my beast into a complete head turner! luving the attention
comments on scoobyworld: quick, easy and reliable, what more can I say? good job all round" - L Field

"Quick and easy to fit. Reduces turbo lag and sounds great. Would recommend to any impreza driver.
comments on scoobyworld: Quality service with helpful and friendly staff" - Jason (surname not provided)

Which one do you need?
1) Impreza 1993-1997 - Original Dump valve on left hand side of engine - your require DV26+FK65

2) Impreza 1997-1999 - Original Dump valve on right hand side of engine bay - you require DV26 +FK66

3) Impreza 1999/2000 - Original Dump Valve fixed to intercooler - you require DV10

All prices include VAT at 17.5%


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Dump Valve - Bailey Motorsport Classic Impreza 1993-2000
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Dump Valve - Bailey Motorsport - New Age Impreza DV12

£128.99 inc VAT

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Bailey Motorsport DV12 dump valve for New Age Impreza (9/2000 onwards) including WRX 03 and STI models.

Note: For cars running higher than normal boost (1.2bar+) or modified cars should select the D type option for harder spring.

Complete with fitting instructions. Fitting takes approx 10-20 mins.

Customer Reviews
"The Bailey (Motor)Sport DV12 dump valve was easy to fit to my MY03 STi and now makes a superb "whoosh" noise, as well as reduced lag on turbo. Excellent product, a necessity for any impreza owner" E.Farnsworth

"Just fitted this superb unit on my MY04 sti,very easy to fit, sounds awesome, gives a slight reduction in lag.Looks quality for those who like "dressing" the engine bay" P Beecham

"(Car - Sep 04 STi)From the moment I opened the parcel, it was clear that the product was quality. The finish is excellent. Fitting was easy with straight forward instructions. On driving the car I coulnt help but laugh, the noise on gear change is infectious with a reduction of lag as a bonus. Well impressed. Can't wait to fit the rest of my order"
Comments on scoobyworld: "Excellent service, my first order and certainly not my last" - M.Jones

"1 word..SWEET!!!...can't get better fitting was easy and took less that a few mins"
Comments on scoobyworld: "GREAT!! Service was unbeliveable..
Got my dv and my exhaust in two days." S Hunt


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Dump Valve - Bailey Motorsport - New Age Impreza DV12
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Dump Valve -Forge Motorsport

£146.00 inc VAT

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Forge Motorsport are well known in the performance car market as manufacturers of some of the finest upgrades you can buy. The Forge dump valves are amongst the most popular variety for Subaru owners due to their robust design and value for money

Scoobyworld can supply the full range of Forge motorsport high quality dump valves, specifically designed to replace the original valves, easy to fit and will not cause any mass airflow or engine idle problems.

Available for all Impreza's up to and including New Age Impreza.

Image shows MY99/00 model

Please note that the Re-circulating valve does not fit 2003-2004 cars.

Customer Reviews
"A dump valve for the best of both worlds. Nice clean wooosh over 3000rpm, when you want it, and a more sublter noise under 3000rpm. Perfect." - J.Everest

"The Forge directly replaced the original BOV on my New Age WRX without any problems. When at low revs you do not notice the Forge. However over 3000 revs it comes into its own and you cannot help but smile.
Comments on scoobyworld: Never felt pressured to buy anything and the advice given on products was excellent. J Twist

"Bought the valve to replace my re-circulating one. Fitted in 5 minutes. Can't beleve the difference it made. Greatly reduced lag for smoother and faster acceleration through the gears. Cool sound too"
Comments on scoobyworld: "Service from Scooby World was top class." -S Duggan

"What an excellent product, well made, and what a marked difference to the pick-up; NO turbo-lag encountered, with the added benefit of the "Whoosh" between gear changes. It scared the daylights out of the wife"
Comments on Scoobyworld: "First class service, as always. Keep it up fellers, your'e doing a grand job" - P Knight.
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Dump Valve -Forge Motorsport
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Dump Valve -Blitz Super Sound

£290.00 inc VAT

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The Blitz dump valves are designed to improve the response of the turbo and are made from polished aluminium with a brass piston. Comes with two trumpets allowing you to alter the sound made.

Boost pressures of over 2 bar are achieved without any effort, and the resulting sound is similar to the current breed of Group 'A' turbo rally cars.

Blitz are the only manufacturers to include two different types of trumpets with the kit so you can change the sound your dump valve makes!

Sound file
Blitz SUS DV

Customer Reviews


This dump valve is the daddy! it sounds great and gives you that little bit more power! - D. Cox


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Dump Valve -Blitz Super Sound
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Scoobyworld Ltd
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Tel:01509 853 502  Fax: 01509 853 533
Enquiries: Sales Team <sales@scoobyworld.co.uk>

SCOOBYWORLD LTD
SUBARU PERFORMANCE PARTS

Unit 3a, Gables Farm Ind. Est, Costock, LE12 6XD
TEL:
01509 853 502 EMAIL: SALES@SCOOBYWORLD.CO.UK
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