What happens when you reduce the vacuum on a turbo?
Less vacuum = less boost. By modulating the amount of vacuum the turbo actuator gets, the ECU is able to control boost pressure. When the ECU cannot control boost pressure, the actual boost deviates from the specified boost. When this occurs, the ECU reduces fueling and requested boost to ensure that the turbo is not damaged.
What causes the turbine side of a turbo to fail?
Prolonged exposure to 2,000 degrees Fahrenheit will eventually take its toll on the turbine (exhaust) side of the turbo. Common failure points due to heat are: stress cracks in the turbine inlet flange, eroded edges of the turbine inlet volutes (pictured below) and deformation of the tips of the turbine wheel blades.
What causes 80 percent of all turbo failures?
Unfortunately, outside debris making its way across the blades of a compressor wheel (the intake side) accounts for 80 percent of all turbo failures.
What happens when a turbo is pushed out of the compressor?
Overspeeding Once a turbo is pushed out of its compressor map, it may not always produce more boost, but it will almost always create excess drive pressure, causing the shaft to see more speed than it was designed to handle.
What causes a vacuum pump to leak on a turbo?
Cause # 5 vacuum leaks or faulty vacuum pump. The device (N75 solenoid) that the ECU utilizes to adjust the amount of vacuum reaching the turbo actuator relies on a constant supply of vacuum from the vacuum pump.
How does the turbocharger boost control solenoid work?
The turbocharger boost pressure control solenoid is controlled by the engine management computer (ECM/PCM) and, depending on the manufacturer design, may open when the brakes are applied, the gas pedal is released, turbocharger speed becomes too low, or the boost pressure sensor detects overpressure.
Where is the cooler pipe on a VW?
Same for the EGR, although I did notice some evidence of a failed gasket (blackening on one side of the flange) where the EGR cooler pipe bolts to the EGR cooler. Hey Keithuk, thanks for looking for me.