Dual Piston Blow Off/Dump Valve
Suitable for most turbo cars with an Air Flow Meter.
Made from billet aluminium, this atmospheric diverter valve dumps the charge-air to atmosphere creating the "Whoosh" sound when the throttle is lifted. This increases both quicker throttle response and higher clamping load to maintain boost pressure more reliably. Unlike single piston or diaphragm diverter valves, this uses counter balanced springs and dual pistons to prevent the valve from leaking air into the intake system at idle. This prevents our diverter valves suffering any of the failures associated with single piston and diaphragm type diverter valves.
Please note if you are purchasing this valve for a Fiat Punto 1.4 93-99 you will also need a fitting kit which can be purchased here.
All Forge Motorsport Dual-Piston Atmospheric Valves have been designed and built with the intent of venting 100% of the residual charge air remaining in your forced induction system to the atmosphere at throttle lift. While we have incorporated many elements into the design of the Dual-Piston valves to aid in their compatibility with mass air-flow sensor equipped vehicles, we cannot always guarantee that each individual’s application will be compatible with a valve that vents the charge air into the atmosphere.
Forge Motorsport nor any of it’s Authorised Distributors can assume any responsibility for any adverse effects resulting from the installation of this valve onto a vehicle whose engine-management-system, whether factory or aftermarket, is not capable of compensating for the loss of metered air through a vent-to-atmosphere valve such as this.
In The Box:
1 x FMDV004 Valve
1 x Forge Sticker
If you wish to tune this product to fit the needs of your engine, please see the spring tuning kits below.
The valve has a port size of 25mm
We have a 14-day return policy, which means you have 14 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at email@example.com. If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at firstname.lastname@example.org.
Damages and issues
Please inspect your order upon reception and contact us immediately if the item is defective, damaged or if you receive the wrong item, so that we can evaluate the issue and make it right.
Exceptions / non-returnable items
Certain types of items cannot be returned, like perishable goods, custom products (such as special orders or personalised items). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please get in touch if you have questions or concerns about your specific item.
Unfortunately, we cannot accept returns on sale items or gift cards.
The fastest way to ensure you get what you want is to return the item you have, and once the return is accepted, make a separate purchase for the new item. Please note that the customer is responsible for ensuring the correct part is ordered and fits the vehicle it purchased for.
We will notify you once we’ve received and inspected your return, and let you know if the refund was approved or not. If approved, you’ll be automatically refunded on your original payment method. Please note the Exceptions / non-returnable items section, which states there are no returns for perishable goods, custom products (such as special orders or personalised items). We also do not accept returns for hazardous materials, flammable liquids, or gases. Please remember it can take some time for your bank or credit card company to process and post the refund too. Some refunds may incur an admin/restocking fee.