What should my fine knock learn be?
According to Cobb, DAM of 0.6 to 1 is normal, and fine knock learn and feedback knock of 0 to -4 is also normal on the 2015+ WRX. Had some fine knock learn of -1.41 lately but never had my DAM go down.
Is feedback knock of bad?
1. Feedback knock correction or Fine knock learning -4.2 or worse at low loads (i.e. cruise/low throttle situations). 2. Fine Knock Learning of -2.8 or worse during wide-open throttle (WOT) run.
How do you diagnose a WRX rod knock?
The most obvious sign of a rod knock is the knocking noise itself. If it is the rod that’s making the sound, it must directly correspond with the engine RPM. If the knocking sound changes with the vehicle speed, you may have a bad axle shaft or suspension problem. The knocking will sound very metal on metal.
Is there knock detection on a Subaru engine?
COBB Tuning has released an excellent article regarding engine knock detection. This should be a mandatory read for all turbo charged Subaru customers, stock or modified. Feel free to send us any questions you may have as well. Knock! Knock! Who’s there? It could be nothing at all, but, it may be cause for concern.
How does feedback knock correction work on a Subaru?
Feedback Knock Correction is a real-time timing correction the ECU makes based on a perceived noise. The ECU immediately pulls timing (the amount of the Feedback Knock Correction value) and adds timing back (value rises to 0) assuming no further noise is detected.
What should the knock value be on a Subaru WRX?
If this value is anything less than ideal, it’s a quick indicator something isn’t right (unless immediately following an ECU reset/reflash). On an 02-05 WRX the values will range from 1 to 16, 16 being ideal. On all other Subarus, the value is expressed as a decimal from 0 to 1, the ideal value being 1.
What can I do to help my Subaru engine resist knock?
Switching to an “LWG” version OTS map may also help resist knock by lowering boost pressure. Use fuel from top tier retailers in your area to ensure your effective octane is as high as its rating.