FS: Cycling Valve (Timed Valve)
FS: Cycling Valve (Timed Valve)
03-15-2007, 02:59 AM
#7
Nordschleife Master
Clarks garage...
"4.3 Cycling Valve
The cycling valve on the 951 is located underneath the intake manifold. It has three ports. One port is connected to the inlet side of the turbocharger between the air flow meter and the turbocharger, one to the discharge of the turbocharger via a banjo bolt on the discharge pipe to the intercooler, and the aforementioned line going to the wastegate diaphragm. Normally, the cycling valve is "open" which allows the pressure from the turbocharger discharge to be bled back to the turbocharger inlet. This is possible because the port on the cycling valve coming from the turbocharger discharge has an orifice in it. When the cycling valve moves toward the "closed" position, it is closing off the port to the turbocharger inlet. This allows pressure from the turbocharger outlet to pass through the cycling valve to the line going to the wastegate diaphragm. This causes pressure to build up on top of the wastegate diaphragm. When the combined pressure on top of the diaphragm and exhaust pressure against the valve seat overcome the spring pressure in the diaphragm, the wastegate will open bypassing the exhaust flow around the turbocharger thereby limiting boost pressure.
The cycling valve is controlled by the KLR Unit (Knock Regulator Unit). The KLR receives signals both directly and from the DME Control Unit to determine how the cycling valve should be controlled. The chips in the KLR have a boost limit which comes preset from the factory. When the actual boost reaches the computers preset limit, the KLR sends a signal to the cycling valve to close which allows exhaust pressure to open the wastegate. If the cycling valve fails, loses power, or a problem occurs in the KLR unit, the cycling valve will fail fully closed. In this mode boost is limited to approximately 1.2 bar. This is essentially the boost at which the force of the exhaust pressure will overcome the wastegate diaphragm spring pressure."
"4.3 Cycling Valve
The cycling valve on the 951 is located underneath the intake manifold. It has three ports. One port is connected to the inlet side of the turbocharger between the air flow meter and the turbocharger, one to the discharge of the turbocharger via a banjo bolt on the discharge pipe to the intercooler, and the aforementioned line going to the wastegate diaphragm. Normally, the cycling valve is "open" which allows the pressure from the turbocharger discharge to be bled back to the turbocharger inlet. This is possible because the port on the cycling valve coming from the turbocharger discharge has an orifice in it. When the cycling valve moves toward the "closed" position, it is closing off the port to the turbocharger inlet. This allows pressure from the turbocharger outlet to pass through the cycling valve to the line going to the wastegate diaphragm. This causes pressure to build up on top of the wastegate diaphragm. When the combined pressure on top of the diaphragm and exhaust pressure against the valve seat overcome the spring pressure in the diaphragm, the wastegate will open bypassing the exhaust flow around the turbocharger thereby limiting boost pressure.
The cycling valve is controlled by the KLR Unit (Knock Regulator Unit). The KLR receives signals both directly and from the DME Control Unit to determine how the cycling valve should be controlled. The chips in the KLR have a boost limit which comes preset from the factory. When the actual boost reaches the computers preset limit, the KLR sends a signal to the cycling valve to close which allows exhaust pressure to open the wastegate. If the cycling valve fails, loses power, or a problem occurs in the KLR unit, the cycling valve will fail fully closed. In this mode boost is limited to approximately 1.2 bar. This is essentially the boost at which the force of the exhaust pressure will overcome the wastegate diaphragm spring pressure."
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03-15-2007, 03:03 AM
#8
Lazer Beam Shooter
Rennlist Member
Rennlist Member
I have a good cycling valve somebody can have for free if they pay shipping.
Thing looks brand new, doesn't even have dirt on it. You can have the cluster of tubes its attatched to too!
Thing looks brand new, doesn't even have dirt on it. You can have the cluster of tubes its attatched to too!
03-15-2007, 01:34 PM
#10
Instructor
Join Date: Jan 2007
Location: Richmond, Virginia
Posts: 212
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What Keith said:
What Paul herd:
Oh, I don't speak turbo, yet.
Originally Posted by Keithr726
Clarks garage...
"4.3 Cycling Valve
The cycling valve on the 951 is located underneath the intake manifold. It has three ports. One port is connected to the inlet side of the turbocharger between the air flow meter and the turbocharger, one to the discharge of the turbocharger via a banjo bolt on the discharge pipe to the intercooler, and the aforementioned line going to the wastegate diaphragm. Normally, the cycling valve is "open" which allows the pressure from the turbocharger discharge to be bled back to the turbocharger inlet. This is possible because the port on the cycling valve coming from the turbocharger discharge has an orifice in it. When the cycling valve moves toward the "closed" position, it is closing off the port to the turbocharger inlet. This allows pressure from the turbocharger outlet to pass through the cycling valve to the line going to the wastegate diaphragm. This causes pressure to build up on top of the wastegate diaphragm. When the combined pressure on top of the diaphragm and exhaust pressure against the valve seat overcome the spring pressure in the diaphragm, the wastegate will open bypassing the exhaust flow around the turbocharger thereby limiting boost pressure.
The cycling valve is controlled by the KLR Unit (Knock Regulator Unit). The KLR receives signals both directly and from the DME Control Unit to determine how the cycling valve should be controlled. The chips in the KLR have a boost limit which comes preset from the factory. When the actual boost reaches the computers preset limit, the KLR sends a signal to the cycling valve to close which allows exhaust pressure to open the wastegate. If the cycling valve fails, loses power, or a problem occurs in the KLR unit, the cycling valve will fail fully closed. In this mode boost is limited to approximately 1.2 bar. This is essentially the boost at which the force of the exhaust pressure will overcome the wastegate diaphragm spring pressure."
"4.3 Cycling Valve
The cycling valve on the 951 is located underneath the intake manifold. It has three ports. One port is connected to the inlet side of the turbocharger between the air flow meter and the turbocharger, one to the discharge of the turbocharger via a banjo bolt on the discharge pipe to the intercooler, and the aforementioned line going to the wastegate diaphragm. Normally, the cycling valve is "open" which allows the pressure from the turbocharger discharge to be bled back to the turbocharger inlet. This is possible because the port on the cycling valve coming from the turbocharger discharge has an orifice in it. When the cycling valve moves toward the "closed" position, it is closing off the port to the turbocharger inlet. This allows pressure from the turbocharger outlet to pass through the cycling valve to the line going to the wastegate diaphragm. This causes pressure to build up on top of the wastegate diaphragm. When the combined pressure on top of the diaphragm and exhaust pressure against the valve seat overcome the spring pressure in the diaphragm, the wastegate will open bypassing the exhaust flow around the turbocharger thereby limiting boost pressure.
The cycling valve is controlled by the KLR Unit (Knock Regulator Unit). The KLR receives signals both directly and from the DME Control Unit to determine how the cycling valve should be controlled. The chips in the KLR have a boost limit which comes preset from the factory. When the actual boost reaches the computers preset limit, the KLR sends a signal to the cycling valve to close which allows exhaust pressure to open the wastegate. If the cycling valve fails, loses power, or a problem occurs in the KLR unit, the cycling valve will fail fully closed. In this mode boost is limited to approximately 1.2 bar. This is essentially the boost at which the force of the exhaust pressure will overcome the wastegate diaphragm spring pressure."
What Paul herd:
Originally Posted by Keithr726
Clarks garage...
"4.3 Cycling Valve
The cycling valve on the 951 is located underneath the intake manifold. It has three ports. One port is connected to the inlet side of the turbocharger
Blah blah balh..., orifice ,... blah, blah, blah."
"4.3 Cycling Valve
The cycling valve on the 951 is located underneath the intake manifold. It has three ports. One port is connected to the inlet side of the turbocharger
Blah blah balh..., orifice ,... blah, blah, blah."
