Design

Throttle body (TB)
The throttle body (TB) is die cast aluminum. The throttle disc is brass on naturally aspirated engines and aluminum on turbocharged engines. The position sensors are under the plastic cover. These read the position of the throttle disc. There are also two connections to the engine in the cover. These turn the throttle disc to the angle requested by the driver.

The throttle body (TB) does not need to be cooled, but may need to be heated. An O-ring in the intake manifold ensures the seal between the intake manifold and throttle body (TB).