No, the blow off valve is letting a surge of power out of the turbo because it lags behind the engine it terms of it's effects, and you don't want the turbo's pressure getting in the way of dropping RPMs when you jam the clutch in. The bypass valve in our superchargers is skipping the supercharger, not blowing pressure out of it. You have a bypass valve that opens up all the time when you're driving around town, but instead of blowing off the pressure, it's stopping the supercharger from making more by routing the air around it and into the engine. Someone correct me if I'm wrong here..korax123 said:Would an HKS bypass valve make the same cool noise as a Blow-Off vavle does?
The only gain to putting an upgraded Bypass/DV/BOV on a FI car be it SC or Turbo would be if your stock valve is failing to hold pressure. Most people do it just for the noise it makes...BoKaThUg1 said:I was looking at racing by-pass valves. Does any one know what would happen if i were to put a universal racing by-pass valve on my Rl? Would i benifit from this in anyway?
Similar in appearance because of the scrolled compressor housing but there are drastic differences when you look close at the two. That and the general design is older than dirt. Here is a tid bit from Superchargersonline about the centrifugal supercharger:Sp00ner said:Yea, and those Vortech style cent superchargers are damn near turbos... the characteristics are VERY similar.
The Centrifugal Supercharger
Although the centrifugal supercharger is founded on a technology much newer than either the roots or the twin screw, it was the first supercharger to be successfully applied to automotive applications. Unlike the roots, the centrifugal supercharger is NOT a positive displacement / fixed displacement supercharger because it does not move a fixed volume of air per revolution. The centrifugal supercharger essentially operates like a high speed fan propeller / impeller, sucking air into the center of the supercharger and pushing it to the outside of the rapidly spinning (40,000 + rpm) impeller blades. The air naturally travels to the outside of the blades because of its centrifugal force created by its rotating inertia. At the outside of the blades, a "scroll" is waiting to catch the air molecules. Just before entering the scroll, the air molecules are forced to travel through a venturi, which creates the internal compression. As the air travels around the scroll, the diameter of the scroll increases, which slows the velocity of the air, but further increases its pressure.
The centrifugal supercharger enjoys several advantageous characteristics that make it the most popular supercharger design in the aftermarket world. First, it is simple and reliable because it has very few moving parts - just a few gears and the impeller. Second, the centrifugal supercharger produces very little heat because of its internal compression ratio. It is also small in size and very versatile because it can "free-wheel" and allow the engine to suck air through it or even flow air backwards. For this reason it can be placed anywhere in the intake tract - it can even "blow through" the throttle body, meaning it can be mounted nearly anywhere. It is also the most thermally efficient supercharger, meaning that it produces the lowest discharge temperature.
The only significant disadvantage of the centrifugal supercharger is that it must be spinning at a relatively high speed before it begins to make a significant amount of boost. For this reason, it is not helpful in creating boost (and power) at low engine rpms. Normally the supercharger only begins to create boost at around 3000 rpm, and the boost curve gradually and increasingly rises with engine RPM. Many centrifugal superchargers do not have a self-lubricating oil system, and draw oil from the engine's oil supply. The disadvantage to this is that you must tap the oil pan for the oil return line. However, in doing so, the supercharger becomes virtually maintenance free. Some manufacturers make a "self-contained" centrifugal supercharger that is self-lubricated like roots and twin screw superchargers.