GM > Engine > Torque Management > Supercharger

Supercharger Torque Management
The values affect Supercharger Torque Management on supercharged V6 engines and L4 engines (eg. Cobalt SS and Saturn Ion 2.0L)

SC3800 V6 Engines

• TCS Mode Threshold: When TCS is active and TCS Mode exceeds this threshold, the VCM will calculate a maximum allowed supercharger boost.
• Enable Speed: If in 3rd gear and above this speed, the Supercharger Torque Management Timer will begin
• Enable Time (secs): If Supercharger Torque Management Timer expires torque is reduced. (ie. 3rd gear, speed above Enable Speed for Enable Time seconds)
• Torque Reduction Mult: Allowed maximum torque is multiplied by this value when enabled.

L4 "LSJ" Engine and other later vehicles

General

• Supercharger: Indicates if a supercharger is fitted to the vehicle.
• Boost Inhibit: If enabled, boost will be permanently inhibited.

Intercooler

• Intercooler: Indicates if an intercooler pump is fitted to the vehicle.
• Intercooler ERT Min: Minimum engine run time to enable intercooler pump.
• Intercooler IAT Min: Minimum intake air temperature to enable intercooler pump.

Boost Limits

• ETC Boost Limit: Maximum boost percentage when ETC power management is active.
• TCS Boost Limit: Maximum boost percentage when traction control is active.
• Reduce IAT: If IAT exceeds this value IAT Boost Limit will be active.
• Full IAT: If IAT Boost Limit is active then IAT must drop below this value to enable full boost again.
• IAT Boost Limit: Maximum boost percentage when IAT Boost Limit is active.
• COT Limit Eq Ratio: If COT Equivalence ratio exceeds this value then COT Boost Limit will be active.
• COT Boost Limit: Maximum boost percentage when COT Boost Limit is active.
• Knock Boost Limit: Maximum boost percentage in relation to the Knock Learn factor (Octane Scalar). Reduces boost if excessive long term knock detected.
• 1st Gear Boost Limit: Maximum boost percentage when in first gear in relation to RPM.
• 2nd Gear Boost Limit: Maximum boost percentage when in all gears (except 1st) in relation to RPM.

Boost Disable

• VSS Min: Boost will be disabled if VSS is larger than this value and TPS below the threshold.
• TPS Max: Boost will be disabled if VSS is larger than threshold and TPS below this value.
• Boost Ramp: Boost will ramp in at this rate after being cut. Lower numbers mean a slower ramp in.

Boost Control

• Proportional Gain: Proportional gain for supercharger boost control, larger numbers mean faster response but increased risk of instability and oscillation.
• Integral Gain: Integral gain for supercharger boost control, larger numbers mean faster response but increased risk of instability and oscillation.
• Desired MAP: The desired MAP for controlling boost, this is the target value the boost control tries to achieve.
• Desired MAP Steady State (S/S): The desired MAP for controlling boost, this is the target value the boost control tries to achieve when in steady state. This reduces boost when in steady state cruising. See steady state parameters below.

Steady State Reduce

• Enable Accel Max: Steady state timer update will be allowed when engine acceleration rate is below this.
• Enable Accel Min: Steady state timer update will be allowed when engine acceleration rate is above this.
• Disable Accel Max: Steady state timer will be reset when engine acceleration rate is above this. High acceleration.
• Disable Accel Min: Steady state timer will be reset when engine acceleration rate is below this. High deceleration.
• Timer Increment RPM: Above this RPM the steady state timer will increment if acceleration is within limits.
• Timer Hold RPM: Below this RPM the steady state timer will reset.
• Timer Hold TPS: If RPM is above the hold RPM and TPS is below this limit then the steady state timer will reset.
• Enable Time: If the steady state timer exceeds this value then the steady state boost control will be used.
• Torque Reduction Mult: Multiplier that reduces the the maximum allowed torque when steady state is enabled.