Can any one tell me exsactly what these are and what they are for. I got a camaro z-28 in here the other day and these had all been changed and I was just wondering what the reasons for changing these.
Thanks

 

Straight from the HPTuners help filoe ...

Throttle Cracker
The throttle cracker parameters are used to open the IAC motor as vehicle operating conditions change.

Throttle Cracker Airflow vs. RPM vs. MPH: This table is used to open the IAC motor as RPM and MPH vary.
Enable Speed: MPH threshold to disable the adaptive idle and enable the throttle cracker.
Disable Speed: MPH threshold to enable the adaptive idle and disable the throttle cracker.


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.

 

Ive tweaked my idle to try and get rid of intermittent surging and these tables have come in handy. Ive tried different combos of opening the throttle set screw and tweaking base air along with iac counts and Ive ended up with the throttle set screw reading .66 V at 0 tps and have adjusted the base idle air, I returned the iac table to stock and have been able to tweak alot of the surging at parking lot speeds with the brakes on and the wheel over to a minimum.

My cam doesnt have alot of vacuum and this has been a mother to tune it to perfection so I can drive it as close to stock as it will ever be. Those table come into play with minor tweaking and it makes sense as alot of cams have problems when you mash the gas and immediately let off, causes surging etc, with these tables we can control how fast the TB shuts and it just makes life easier with an NA cam.

The tables that need tweaking are the in gear tables not really the ones concerning out of gear.

 

thanks for the replies.
would there be any reason to change any of these settings on my truck with a stock cam? the camaro with a stock cam i had in the other day had several of these settings changed (comparing to a stock tune) and his throttle response is really quick, i was just wondering if any of these changes had to do with this?

 

No reason at all on a stock cammed motor.