Diaphragms can tear Diaphragm durometer changes with temperature Could get harder or softer Stretchability is variable
Slow response Non-linear actuation Pressure has to stretch diaphragm before moving the valve
You can only adjust spring pre-load You cannot reap the benefits of adjusting spring rate No control of the valve’s rising rate ratio per pound of boost
Pressure is wasted on stretching the diaphragm before acting on the valve
While the legacy diaphragm WG stretches the diaphragm, Synchronic Wastegate has already lifted the valve
Boost-Only Pressure Signal 5 psi With Synchronic Wastegate spring rate can be changed with the same pre-load, to change the amount of valve lift per pound of boost
The legacy wastegate only allows adjustment of spring pre-load to control when the wastegate opens and the resultant boost level.
Spring rate cannot be increased independent of pre-load. Higher boost is achieved with a combination of increase pre-load and rate. Spring Rate = 25 lbs./in.
As you increase spring rate, the diaphragm will have to stretch more to accommodate the resistance. Spring Rate = 25 lbs./in.
The reduction in overall valve lift then produces boost creep. Spring Rate = 25 lbs./in.
Adjust Spring Pre-Load
Vary Spring Rate Only
Adjust Spring Pre-Load Vary Spring Rate Only 6 Different Built-In Boost Levels Without a Boost Controller
Adjust Spring Pre-Load Vary Spring Rate Only 6 Different Built-In Boost Levels Without a Boost Controller Variable Exhaust Flow Control
Adjust Spring Pre-Load Vary Spring Rate Only 6 Different Built-In Boost Levels Without a Boost Controller Ability to Keep WG Closed Without Using CO2 Variable Exhaust Flow Control
Adjust Spring Pre-Load Vary Spring Rate Only 6 Different Built-In Boost Levels Without a Boost Controller Ability to Keep WG Closed Without Using CO2 Potential For Anti-Lag Feature Variable Exhaust Flow Control
Boost-Only Pressure Signal
Different size valve seats allow for fine tuning of flow and performance
1.Determine and set maximum boost pressure 2.Determine flow requirements and select appropriate valve seat 3.Vary spring rate depending on overall valve lift requirements 4.Adjust pre-load to achieve target initial wastegate opening 5.Use a controller to lower boost pressure for conditions that don’t require maximum performance
Boost-Only Pressure Signal Solenoid
Boost/Vacuum Signal Exhaust manifold vacuum between gears and under decel is bypassed through the WG eliminating loss of inertia