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Green Classic & Vintage Spares

Adjustable Dump Valve Twin Piston Atmospheric (TBV002.25B)

Adjustable Dump Valve Twin Piston Atmospheric (TBV002.25B)

Regular price £116.88
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TBV002.25B Misc Turbo Dump Valves & Boost Adjusters

Motorsport Adjustable Dump Valve Twin Piston Atmospheric (Blue)
Standard Range :- 0.5-1.2 Bar
Uprated Spring Range:- 1.3-3.0 Bar (Supplied in the box)
Available in Red,Black,Blue & Silver
Size Range:- 20,25,34mm

Dump valves are designed to vent unused pressure to atmosphere when the throttle has been released. When accelerating the turbo charger produces positive pressure which is used to supply the engine with large amounts of compressed air. When you lift 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 prevent the turbo from spinning, this is known as compression 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.
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Model Compatibility

Audi A3 1996-2003
Audi A4 1995-2001
Audi TT 1998-2006
BMW 3 Series (E36) 1990-2000
BMW 3 Series (E46) 1998-2006
BMW 5 Series (E39) 1995-2003
Fiat Punto 1993-1999
Ford Escort RS Turbo 1986-1990
Ford Focus ST170 2002-2004
Ford Fiesta Zetec S 2000-2004
Honda Civic Type R (EK9) 1997-2000
Mazda MX-5 (NA/NB) 1989-2005
Mitsubishi Lancer Evolution IV-VII 1996-2003
Peugeot 106 GTi 1996-2003
Renault Clio 182 2004-2006
Renault Megane 225 2004-2009
Subaru Impreza WRX/STi (GC8) 1992-2000
Subaru Impreza WRX/STi (GDB) 2001-2007
Vauxhall Astra GSi 1993-1998
Volkswagen Golf GTI (Mk3) 1992-1998
Volkswagen Golf GTI (Mk4) 1998-2004
Volkswagen Polo GTI (6N) 1994-1999

Part Number

- OEM part number(s): TBV002.25B
- Equivalent: N/A

Shipping Information

Standard shipping with tracking via Royal Mail or Evri for heavier parts:
- £4.99 per order for standard 2-day delivery
- £5.99 per order for Next Day delivery

Most orders are shipped the same business day if ordered before 2pm. We ship Monday through Friday.

If we unexpectedly run out of stock we may have to order your part which can take up to 1 week. We will be in touch in the rare circumstance that there is a delay to your shipment.

Returns Policy

We want you to be completely happy with your purchase but please do not hesitate to contact us immediately if you have a problem with your order. Please ensure that you consider all the points described on our profile page accessible by clicking our name above the product title.

It is especially important that you take due care to ensure that the part you selected is compatible with your car. If in doubt, we'd prefer that you get in touch via our profile page so we can help you.

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