Control the mass of air entering the engine in response to the driver's pedal request.
A Bosch 40 mm electronic throttle body. Because it is electronically actuated rather than cable driven, the ECU sits between the pedal and the plate, which allows auto-blipping on downshifts, torque-based throttle maps, control of engine drag torque during overrun, and improved efficiency during cold start, warmup and idle.
Selected for proper incorporation of the Bosch 40 mm electronic throttle body with freedom of use of a Wiggins clamp at the base of the restrictor. Running electronic throttle is what makes the BSPD mandatory. The Koso 34 mm mechanical throttle body was the comparison case, evaluated for its effect on CG height.
Rules require full BSPD and redundant sensing to run electronic throttle. Throttle plate position and torque output are not linearly related, so the pedal-to-plate translation has to scale minimum and maximum manifold pressure for a given engine speed to linearise the driver's torque request.
Purchased Bosch unit. From the cost report drawings and CAD: From the cost report drawings: Aluminum (Electronic throttle body).
None recorded. This part has no entry in Knowledge_Transfer/Issue Logging/Fault Vault.xlsx, in either Issue Log.xlsx, in CR22/Issue Tracking/Shakedown 7-15-23.xlsx, or in any design review issue list found in CrimsonStorage or Box.
Dimensions called out on the cost report drawings. These are the figures printed on the drawing, not a labelled specification; open the drawing itself for what each one refers to. Throttle_Body (as drawn): 7.70, 11.10, 6.08, 6.58, 6.04, 3.98, 0.66, R0.75, 4.00 Electronic throttle body (as drawn): 47.61, 4.76, 111.30, 11.13, 40.22, 4.02, 108.00, 10.80, 6.60, 0.66 Quantity on the drawing: 1. Source: Cost report drawings: CR22/Powertrain/Design/X - Cost Report Drawings/Manifolds/Intake/Throttle_Body.pdf; CR25/Powertrain/Design/Y - Cost Report Drawings/Manifolds/Intake/Electronic throttle body.pdf; CR26i/Powertrain - IC/Design/Y - Cost Report Drawings/Manifolds/Intake/Electronic throttle body.pdf; CR27i/.Powertrain/Design/Y - Cost Report Drawings/Manifolds/Intake/Archive/Electronic throttle body.pdf Quantity per car, as costed: 1
Nothing in CrimsonStorage covers these yet.