Bailey or Forged?

[Too Cold NB1.8T]

Originally Posted by Red Rider

Too Cold--why is HKS more difficult to install--is it a blow off valve--where did you get the valve

Well Red, the HKS SSQV is a little more involved in terms of proper installation than most other valves because it is designed to mount directly on top of the upper rear charge pipe, the same pipe that the turbo output feeds into via an elbow and the factory DV hose connects to.

When correctly installed the HKS SSQV mounts on a flange/bung that has been welded to the charge pipe and feeds the released air pressure directly from the source to the atomosphere (BOV) or into the intake hose after the MAF (DV).

All of those valves like the Forge, Baileys, Turbo-X and VF engineering etc., are really only billet aluminum versions of the stock DV with a piston in place of the diaphram, although these valves are much improved over the stock ones and 710N, they still create problems such as:

1. Low speed/ on-off throttle pulsing/surging or fluttering due to inconsistant operation related to vacuum variations that cause the piston to act irratically.

2. They are still prone to pressure leaks because due to the valves stock like design, the in coming air pressure is pushing against the piston/diaphram and can open it causing leakage.

The SSQV is designed so that the charge pressure is actually pushing the vent door closed, the higher the boost the tighter the seal, it also has about a 60mm flow diameter (very large) with a two stage pressure release to account for all levels of pressure needing to escape, the mounting bung gets welded where the larger of the two nipples is located.

After installing my HKS SSQV, I noticed that the low speed fluttering or irratic opening and closing of the pressure release valve I spoke of earlier, completely disapeared , shifts were far more crisp, the vehicles overall performance was much improved and a lot more consistant, I also feel that this setup looks much more refined and gives the engine a cleaner appearance.

I run the vf engineering race dv--its a big dv

A BV and DV do exactly the same thing (vent pressure), the only difference is the BOV vents to the atmosphere and the DV vents back into the intake duct via additional plumbing. The SSQV can work either way, mine is setup as a DV which is what these engines require.

I bought my HKS system locally but you can contact them for purchase options if you are interested, after using the HKS, I personally wouldn't think of ever going back to any of those other valves, they don't compare.

[Too Cold NB1.8T]

An installed pic.