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Dump valves (also known as blow-off valves) are not a new idea and have been around since the early 1980’s. Their function 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 backpressure that tries to stop the turbo from spinning, this is known as ‘compressor stall’. By fitting a dump valve, every time you release the throttle the excess boost pressure will be released, which means a significant reduction in turbo ‘lag’, contributing towards faster pick-up between gear changes. In extreme cases on cars with high revving engines or large turbochargers, the shaft within the turbo has been known to snap when no form of dump valve has been used. A counter product of the reduced back pressure is that the turbocharger itself will last longer as less thrust load is placed on the delicate internals. These two reasons are why re-circulating dump valves are now fitted as standard equipment on most turbocharged production cars, albeit of sometimes compromised quality. After many years of exhaustive testing on a wide variety of both road cars and high powered race cars, Bailey Motorsport introduced the Piston design in 1997. Piston dump valves have many advantages over their diaphragm style counterparts, including faster reaction times, increased boost capability and in the case of our ‘EVO’ valve the ability to work on cars with airflow meters. (not possible with diaphragm type dump valves)
Audi A3 1.8 20v Turbo Audi S3 1.8 20v Turbo Audi A4 1.8 20v Turbo Audi S4 2.7 30v Twin Turbo (2 valves) Fiat Uno Turbo Mk1/Mk2 Fiat Punto GT Fiat Coupe 16v/20v Ford Sierra Cosworth 2wd & 4wd Ford Escort Cosworth Lancia Delta incl. HF & Integrale 8v/16v Maserati Most Bi-Turbo models Peugeot 406 Sri Turbo 8v Porsche 911/944 Turbo Renault 21 Turbo Renault GTA V6 Saab Leon 1.8 20v Volvo 440/480/740 Turbo Volkswagen Golf Mk4 1.8 20v Volkswagen Passat 1.8 20v Description Part No. Use Valve Type Rover/MG 220/420/620 Turbo.......................................... FK35 .......... DV24 820 Turbo ......................................................... FK38 ......... DV24 Metro Turbo** ................................................. FK40 .......... DV24 Maestro/Montego Turbo ................................... FK42 .......... DV24 Saab 9000 2.3 Turbo................................................. FK10 .......... DV26 Subaru Impreza –’97 ..................................................... FK65 .......... DV26 Impreza ’97-‘99 ................................................ FK66 ......... DV26 Toyota MR2 turbo ......................................................... FK70 .......... DV26 Celica GT4 ‘94-’99 ST205 ................................. FK71 .......... DV24 Supra Single Turbo........................................... FK72 .......... DV26 Starlet GT Turbo 1.3 ........................................ FK75 .......... DV24 Vauxhall Calibra/Cavalier Turbo...................................... FK60 .......... DV26 Astra Coupe Turbo ‘01- ................................... FK62 .......... DV26 Volvo 440/480/740 Turbo.......................................... FK10 .......... DV26 850 T5/T5-R ..................................................... FK80 .......... DV26 Universal ‘Weld-on’ kit (Alloy) .......................................... FK-WOA...... N/A ‘Weld-on’ kit (Steel) .......................................... FK-WOS...... N/A Description Part No. Use Valve Type Daihatsu Charade GTti ...................................................FK45 ...........DV24 Fiat Uno Turbo Mk1 (1.3)/Punto GT ......................FK25 ...........DV26 Uno Turbo Mk2 (1.4) ......................................FK26 ...........DV26 Coupe 16v/20v Turbo.....................................FK28 ...........DV26 Ford Escort RS turbo S1/S2...................................FK5.............DV26 Sierra/Escort Cosworth (std position)............FK10 ...........DV24 Escort/Sierra Cosworth ‘Cold-side’* ...............FK11 ...........DV24 Escort Cosw. T25 (YBP) 1995 on (small turbo) .....FK12 ...........DV26 Fiesta RS Turbo ..............................................FK30 ...........DV24 Lancia Delta, incl. HF & Integrale 8v/16v..................FK10 ...........DV24 Lotus Elan SE Turbo 1.6 ..........................................FK90 ...........DV24 Mazda 323 4x4 1.6 Turbo .........................................FK50 ...........DV26 MCC Smart Car 3 cylinder......................................FK100 .........DV24 Mitsubishi Lancer EVO 5/6 ..............................................FK52 ...........DV26 Nissan 200SX S14 2.0 Turbo ’94-’99 ........................FK54 ...........DV26 200SX S13 1.8 Turbo ’89-’93 ........................FK55 ...........DV26 Sunny/Pulsar GTI-R .........................................FK56 ...........DV26 Peugeot 406 8v Turbo..................................................FK10 ...........DV24 Renault 5GT Turbo .......................................................FK20 ...........DV24 21 Turbo ..............................
Dump Valves for Performance and Modified Cars

You can get some great deals at the Plaything car modification online Shop.

For example

Bailey motorsport products Dump Valves from £69.95

PromotaSPORT Alloy fabrication products Best Price.

LC Signwritting Fast'n' Furious Car Graphic sets from £100.

Showplates from DE51GNA Custom design £12 per plate.

All prices include vat and P&P There are no hidden costs.

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We are pleased to be able to offer you Dump Vales from Bailey Motorsport Car Dump Valves from Bailey Motorsport at the Plaything Shop.

        Typical prices
             DV 64 £69.95 Including vat
             DV 26 £69.95 Including vat


Dump Valve Fitting Kits
We also supply a range of Dump Valve Fitting Kits for most cars.

You can find more information on Dump Valves and many other car tuning products by visiting The Tuning Section on Its a Plaything. Alternatively use our search engine to check the database.

The Plaything Team