Engine --> Idle --> Airflow --> TPS STEP SIZE (%) ?

[Danspeed1]

Its a simple enough question but I can't seem to find the exact answer to it anywhere; What does it do? How does it work? What does it effect?

Thanks!

[Danspeed1]

Wow... nobody knows lol

[Matt Vardaman]

Throttle Follower
The throttle follower parameters are used to adjust decay and delay rates for the IAC motor during throttle closure to slow the return to idle during a sudden throttle closure.

Throttle Follower Airflow Decay vs. Speed (In Neutral): The decay value is the rate at which the IAC motor closes when the throttle is closed and the selector is in Park or Neutral. These values are subtracted from the current IAC Airflow value every 12.5 ms, hence higher numbers mean faster decay.
Throttle Follower Delay Time vs. Speed (In Neutral): This is the delay before the decay value begins to be subtracted in P/N.
Throttle Follower Airflow Decay vs. Speed (In Gear): The decay value is the rate at which the IAC motor closes when the throttle is closed and the selector is in gear. These values are subtracted from the current IAC Airflow value every 12.5 ms, hence higher numbers mean faster decay. The 4th Gear row is used for gears including and above 4th gear for M6 transmissions.
Throttle Follower Delay Time vs. Speed (In Gear): This is the delay before the decay value begins to be subtracted in gear.



TPS Tracker Step Size %: This is the rate at which the throttle follower tracks the current TPS value.
Throttle Follower Airflow vs. TPS: This is the throttle follower airflow value used as the throttle is opened. It is the value that is reduced to zero by the decay parameters if the throttle is closed. It is versus TPS %.
Throttle Follower Airflow Mult vs. RPM: This table is used to enable the throttle follower in relation to RPM

It is my understanding that the TPS step size means the the tps has to move 0.7% (value in my tune) for the throttle follower to react. Meaning if you barely move your throttle lets say .5% the throttle follower won't react, and if you move the throttle more than the step size it will move the iac valve/etc blade.