| Message |
If it isn't one noise, then it's another. To me, my current Z made a flutter-like sound on stock recircs and still sounds similar with the GHK installed. Some say theirs sound like a BOV, others say they don't... who's right here? I definitely don’t believe it’s a sound being created by the compressor wheel(s) surging; if anything, it’s more of a noise created at the valve’s orifice and is most likely due to the valve itself opening and closing slightly and changing the harmonics being heard and described as “flutter”. How can it open and close slightly? Well, it’s main control comes from the vacuum diaphragm, but air rushing through the valve has some force to it, which does act on the valve and could cause movement… albeit ever so slight, but enough to cause a modulation in the sound being emitted. The current GHK springs increase the total spring pressure within the recircs to a level that prevents them from opening up to a dP of ~12 psi. I set them to this pressure to be sure they would never be open under idle conditions and if people wanted to, they could vent them rather than recirculate and not run the risk of an open valve occurring during low-load deceleration. A high-load, off-throttle shift scenario creates more than enough dP to open the GHK equipped recirc. Keeping the recirc valve closed a bit longer is what prevents the goose honk and there is no way to have one without the other. BOVs work in the exact same manner.
|
 |
