Tech Bulletin -Subaru - Wastegate Frequency & Behavior

Date: 1/17/18
By: Mike McGinnis

Vehicles affected:

• Subaru

Software affected:

• 1.9.1.0-15423 15639 and newer

Firmware affected:

• not applicable

COBB has exposed the factory wastegate frequency table on a number of Subaru models. While wastegate frequency change does have a consistent effect predictable result on wastegate solenoid on time (ECU output voltage low), wastegate behavior is not consistent across Subaru models due to differences in the drive circuitcurrent. This bulletin is meant to provide some additional info to save you time and reduce surprises.

We hope this Tech Bulletin helps you to more effectively tune wastegate frequency and duty cycle tables. If you have any feedback, questions, or concerns please let our Subaru Expert Group know