Quote:
Originally Posted by RobZL1
Tuning should have fixed the negative timing by adjusting the torque and airflow modeling.
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Yep!
Anyone attempting TB should observe their Zero Pedal Engine Torque and compare it to Predicted and Immediate Tq and update their Torque Model values to get their timing back in the positive values, somewhere like 0 to +10 degrees (ish). Also want to tweak the throttle body area values and if you are feeling skilled go into driver demand tables to adjust curves for improved driveability.
Here is a video that touches on this topic, it is associated with changing the CAM but at the end of the day both TB and CAM are changing the airmass into the cylinder: