This listing is for a Single ATI / Procharger Black Race Bypass Valve With Mounting Hardware - Open (Steel Flange)

The race bypass valve with the steel flange is for use with steel tubing, likewise the race bypass valve with the aluminum flange is for aluminum tubing. These kits include the valve, mounting flange, tube, vacuum line and fittings.

The open race valve vents the air directly to the atmosphere, which can make a loud noise. Depending on where the race valve is located, it can also kick up a lot of road dust. The enclosed race valve is designed to enable a hose to be clamped to it, this allows the air to either be run back into the system or dumped wherever the installer desires. Routing the hose past the firewall quiets down the release of air from the valve.

ATI/Procharger Part # 3FASS-008B

Importance of Bypass/Surge Valves
Applications utilizing intercooling and those operating at boost levels in excess of 8 psi will benefit from the use of a bypass valve (commonly referred to as a “surge” valve). In high RPM, low load conditions, the supercharger is still operating at full speed and attempting to deliver full flow. With the throttle blade(s) at or near the fully closed position, the engine is unable to accept the airflow from the supercharger. In this event the pressure builds until the flow attempts to reverse direction and exit through the compressor, resulting in a harmful condition known as compressor surge. Installing a bypass valve between the supercharger discharge and the carburetor/throttle body prevents damaging compressor surges by diverting the undemanded charge air to the atmosphere during manifold vacuum conditions. ATI’s butterfly-type Pro-Flo is well suited for applications making 750 hp or less. Applications at higher power levels are best suited for use with our poppet-style race valve.

Bypass Valves vs Blow Off Valves
Blowers are always producing some amount of boost as they are belt driven, where a turbo spools up as the exhaust velocity is increased. Bypass valves are used with blowers since they always relieve the boost until near zero vacuum (heavy throttle) is achieved. Blow-off valves are designed to relieve boost at a set amount of boost, and can cause boost stacking when used with a blower. Light springs can be used with blow-off valves so that they can be used with blowers, and many have reported success with doing so. Unless a blow off valve is properly set up with a light spring though, the boost that is built up places a load on the blower that is hard on it, plus it will try to slow the blower down which can cause belt slippage. Stacked up boost will also try to find weak spot in the tubing and hoses to blow out of. This is why Bypass Valves are better than Blow Off Valves.

TREperformance is an Authorized Priority Dealer of ATI Prochargers.

We have ATI / Procharger supercharger systems to fit almost every performance application!
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TREperformance
1725 Monrovia Ave.
Suite D7
Costa Mesa, CA 92627

  

• Policies

RETURNS AND EXCHANGES:
We accept returns of unused, uninstalled, brand new goods, but we must charge a restocking fee of 20% to cover the costs we incur from eBay, Paypal, shipping, labor, etc. We also must charge a 20% restocking fee on any order which is cancelled after payment has been received, even if that order has not shipped. This is also to help cover the fees associated with eBay, PayPal, order processing, restocking, etc. If you would like to return or exchange an item please email us with your paypal or authorize.net transaction id # and the reason for the return or exchange.
No returns are accepted without an RMA number which is given to the customer by TREperformance via email. Always have the RMA number clearly written on multiple sides of the package when you return the item. If it is not clearly written on multiple sides of the box it may be returned to sender. All returns must be received within 30 days of purchase.

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Contact info:
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Mailing, Shipping & Storefront Address:

TREperformance
1725 Monrovia Ave.
Suite D7
Costa Mesa, CA 92627