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This is a tragic story for this rider. It seems quite obvious Harley screwed up royally with software.
The story seems so clear that when Harley refused to pay the medical bills for $53 or the repair bill for the first accident of $25k....the guy has another accident with the same malfunction and sues and wins a case against Harley for over $200 million dollars.
It figures, but some people still do not understand. Trump does NOT want war, nor does Putin. Nor does Europe or the rest of the world. In fact no one feels safe with the current USA Democratic party. If you look at history its the Democrats that have always been happy to go to war.
Today Mike looks at turbocharger wastegates and how they are used in a turbocharged vehicle application to control boost pressure. We talk about the differences between internal and external wastegates, how they work, installation considerations and we take a look at the internal components. We also check out the new line of wastegates from Garrett Motion who supplied us with a cool cutaway example of their new GVW
A boost controller can be used to control the boost pressure of a turbocharger with an internal wastegate by adjusting the pressure going to the wastegate. A basic boost control setup involves a wastegate and a wastegate actuator, and works without any electronics.
Here are some steps for installing a boost controller for an internal wastegate: - Let the engine cool down - Locate the wastegate actuator port and pressure source on the turbocharger - Remove the factory boost control solenoid from the boost pressure supply port - Install the boost controller in the wastegate pressure line, with the wastegate arrow pointing towards the actuator. - Block any additional ports on the actuator - Secure all hose ends with hose clamps - Mount the boost controller bracket and attach the controller to it - Before making adjustments, turn the boost dial completely counterclockwise
A boost controller works by modifying the pressure signal sent to the wastegate actuator. This allows the turbo to produce a new boost level.
Wastegates allow exhaust gasses to bypass the turbine of a turbocharger, regulating its speed (RPM), when a specific spring pressure is reached.
How Does A Wastegate Work?
Wastegates can be controlled in several ways but the way they work out of the box is by referencing the turbochargers boost pressure. The spring/s inside the housing are rated for various pressures. Many wastegates are calibrated to 14.5 PSI | 1 Bar of pressure. A boost pressure reference line is run to a port on the lower wastegate housing filling it with boost from the turbo. As the turbo spins faster, it makes more boost. Once the boost signal starts to reach the spring pressure, the valve will start to lift/open, allowing air to bypass the turbine of the turbocharger. Bypassing exhaust air around the turbine regulates the RPM of the turbocharger so it cannot make more boost pressure than the combined spring pressure. (if the valve is sized properly).
What Is The Difference Between Internal And External Wastegates?
Internal and external wastegates are both valves that bypass exhaust air around the turbine of a turbocharger in order to regulate turbo speed/boost pressure). The differences are the size of the valve and the placement of the valve.
Pros and Cons For Internal And External Wastegates
External Wastegate Pros
• Multiple valve sizes
• Larger valves respond quicker and smoother to provide even boost control
• Less backpressure in the manifold
• Add multiple valves to get the flow you need
• Fabricate for best air priority
• More efficient design
• Better heat control through design and water cooling
• Serviceability through replaceable components
• Color options
External Wastegate Cons
• Larger in size and requires additional fabrication
• Additional component/s to integrate into the turbo system
Internal Wastegate Pros
• Compact and simple because it’s integrated into the turbine housing
• Reliable for lower boost pressures
• Cost effective
Internal Wastegate Cons
• Small valve with limited flow capability
• Cannot increase size of valve
• Slower to respond to changing boost pressures
• Can have issues with overboost in high flowing configurations which can damage the engine
• Bypassed flow can cause turbulence in the housing resulting in additional backpressure and turbo lag
• Valve is integrated into the turbine housing increasing heat buildup
Here you can see the pros and cons of internal and external wastegates. Based on your setup, it may be best to utilize external wastegates especially with higher horsepower applications. Now, in large frame turbo applications you must use external wastegates.
