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[bbrowncods]

Originally Posted by HD-Monster-Torq

Without this box selected, the IAC goes down to 35. (Verified this in the log file).

With this box selected the IAC goes down to 20 in the log file. Also the number in the Nominal Idle IAC Steps will be change down by the system.

Bike seems to start better with the box not selected.
We are at sea level.

What does this option do in detail?

Box NOT checked. The Nominal value stays at what you put in the basic table. It will stay at that value and does not change, even if the engine needs more or less. The software will just correct the IAC in order to keep the engine idleing at the required RPM.

Box checked. While at idle and the VSS at 0, and hot (so there are no "additions"), the IAC will be moving in order to keep the engine at the set idle RPM (same as NOT checked above). If there is a correction to what is in the basic table, in order to keep the idle RPM at the set speed, then the software will input the new value.

This theoretically will zero out any correction factors as the nominal IAC value "learns" where it needs to be for idle.

Here is the problem. All the IAC correction factor tables are based on the nominal value of 35. So if it learns that it needs to be at, lets say 20, then all your IAC correction tables will be not enough by 15. Conversely, the opposite is also true. Therefore cold start idle may initially be rough until the correction loop kicks in to get the idle speed where it needs to be.

In my opinion the DTT idle is way to complicated. Just set the idle speed for what ever the engine temp is and let the IAC do its thing. No need for all these tables for time and cold start, etc.