Variable Geometry Turbocharger (VGT)
A variable geometry turbo has movable vanes that change exhaust flow onto the turbine to give boost over a wide rev range.
What is Variable Geometry Turbocharger (VGT)?
It is common on diesel engines. An electric or vacuum actuator moves the vanes. Soot can make the vanes stick. Some workshops clean sticky vanes, but the turbo often needs reconditioning; the actuator may need calibration afterwards.
How it works
Closed vanes speed up the exhaust at low revs; open vanes reduce back pressure at high revs.
Why it matters for your car
Sticking vanes cause overboost or underboost codes and limp mode. Regular motorway driving helps keep the mechanism clean.
Other terms
- ABS (Anti-lock Braking System)
- Alloy Wheel
- Axle Stands (Jack Stands)
- Battery Charger (Smart Charger)
- Booster Seat (Child Booster)
- Charge Point Operator (CPO)
- Chassis Straightening (Frame Straightening)
- Driving In Hot Weather
- Exhaust Backpressure
- Flat-Plane Crankshaft
- Fuel Rail
- Gearbox Warning Light
- Lightweight Flywheel
- Limp Mode (Emergency Mode)
- Oil Filter
- Parking Pawl
- Regenerative Braking
- Soft-close Doors
- Tyre Bulge (Sidewall Bubble)
- Tyre Hotel (Tyre Storage Service)