[pthornton]

Disconnect the ISC and let the car idle. Set the throttle body screw so that the car will just barely idle. Set the TPS to ~0.99. Now datalog the car for about 30 seconds after it is fully warmed up. Average the airflow and convert it to the correct units for the throttle body airflow. Set the throttle body airflow.

Now reconnect the ISC and datalog the car at several different RPM points for at least 30 seconds. Set the idle RPM to do this. Average the numbers for RPM and airflow and set the X & Y values in the ISC nuetral airflow function. You will probably have to change the X values to match the RPM values you average from the datalog as it will not match what you set the idle to.

This step is if you have problems with stalls on pushing in the clutch on coast down. Compare the new ISC settings to the old settings and figure out what percentage increase you have. For me this was the exact same percentage for all Y values in the function. Increase the dashpot pre-postion by the same percentage.

air flow conversion factor is:
MAF * 2.2046226 / 60

[boss96]

Thanks, Randy, I've moved it to FAQ.
Bob

[Bullitt5094]

There is something you aren't taking into account here. There is an Idle Air Corrrection factor table in the EEC which is an adapative function. If you don't reset the EEC before you start this proceedure, that correction factor will throw your adjustments off. I don't believe you can log this table in the Tweecer but it is there.

[boss96]

Yes, you're right, the top 2 rows in the "adaptive fuel update" table are the ones that control that.
Bob

[Bullitt5094]

If you can read the correction values, you should be able to use that information to make the ISC table corrections.

[boss96]

As far as I know you can't read the correction values like you can for fuel trims. I have not heard of any other software (SCT,Diablo) that can do that either.
Bob

[Bullitt5094]

You can with the SCT Raptor/Xcal2