COBB Tuning LF BPV – 2015-2021 Subaru WRX & 2014-2018 Forester

$476.07

Documents

Installation Instructions & Videos

SKU: 745665 Category: Tags: , , Brand:

The COBB LF BPV is a compact and lightweight by-pass valve that is capable of holding very high boost pressure without leaking. Its updated design reduces control volume by 30% allowing for extremely fast venting of boost when actuated. Innovative engineering and precision manufacturing result in a compact package able to fit in the confines of a tight engine bay. Due to the low weight of the components, the moving parts in the LF BPV have less inertia and can respond faster than heavier components in other bypass valves. This updated design uses a Banjo-fitting vacuum port which provides 360-degree adjustability of hose routing. This results in a simpler install and fewer potential leak points than the NPT ports. This new design also includes a piston o-ring seal that is twice the diameter of the old design allowing more seal compression and reduced wear. The adjustability of the spring seat is no longer needed due to the updated spring and seal design which provides a 60% increase in clamping force at peak boost while maintaining similar operation at idle and transient loads.

Note: This is an updated version of the original 745665 LF BPV that now includes a different internal spring.
Original Spring (uncoated)
Free length: 3.5″
Rate: 7.4 lbf/in
Bench cracking vacuum installed in LF BPV: -5.7 psi

New Spring (yellow)
Free length: 2.25″
Rate: 40.5 lbf/in
Bench cracking vacuum installed in LF BPV: -6.7 psi

FEATURES

  • 100% Billet Aluminum Construction
  • 100% O-Ring Sealing
  • 100% Rebuildable if there ever is an o-ring failure

A compact and very lightweight bypass valve that is loaded with features and reliability holds high levels of boost without leaks.

Additional information

Weight1 kg
Dimensions20 × 20 × 10 cm

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Applications

Models suitable for this product

MakeModelYearSubmodel
MakeModelYearSubmodel
SubaruForester2014 - 2018XT
SubaruWRX2015 - 2021

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