I no longer experience any part throttle rapid opening and closing of the electric OE unit. It was a pain to get it working properly, but worth it. After cutting numerous coils off of the softer green spring and adding a couple washers to fine tune, it works as advertised. To solve this, I reinstalled the stocker and placed the TS unit on my cowl with the vacuum line connected and drove around to see when and how fast the unit was opening and closing. You can't see the movement of the brass piston on the plum back with the unit mounted. The next issue was the spring tension was too great. I first had to use some fine steel wool, a drill with a large Allen socket and some metal polish to slightly reduce the diameter of the piston to allow it to move when hot. The tolerances on the piston are too tight, and add to that, the slightest uneven or over tightening of the three fasteners were contributors. As a note, this was using the TS machine oil. A flutter valve, also known as the Heimlich valve, is a one-way valve used in respiratory medicine to prevent air from travelling from the lungs to the chest cavity. Even with the spring off, the piston would not move once the valve heated up. Sure, it moved freely on my bench when at room temp but not when hot and attached to the turbo. Flutter valve devices are used by individuals with a build-up of mucus. The device uses a combination of Positive Expiratory Pressure (PEP) and Oscillations. This Positive Expiratory hand-held device works to clear mucus to increase lung expansion and reduce airway obstruction. PEPE is a drug-free handheld airway physiotherapy device, Australian owned and manufactured. I first noticed that the piston was not moving at all when hot. PEPE - Positive Expiratory Pressure Exerciser. THE BREATHER Natural Breathing Exerciser Trainer For Drug-Free Respiratory Therapy Breathe Easier with Stronger Lungs Guided Mobile Training App Included. I was hearing a lot of flutter under heavy acceleration and I'm running a stock air box. This item: Portex Acapella DM (Blue) 3799. The TS plum back gave me a headache for a while.

I had to cut my spring in half in order to get the piston to open under vacuum.

The only adjustment available is to go with the lower power green spring or cutting the spring.

Flutter valve purchase