What is Knock? With Harvey from The Boostcreep

Harvey ,aka the Boost Creep, comes by the shop to discuss Subaru engine knock, ignition timing and what to watch for on your Accessport. He brings some serious knowledge on how fine knock learning, feedback knock and DAM work together to control ignition timing in Subaru engines. 

Thanks for watching and Stay Tuned!

In this Episode:

00:00 - Intro 
00:47 - What is engine knock? 
01:47 - Subaru EJ vs FA knock difference 
02:34 - Different kinds of knock 
04:46 - How does engine timing work? 
05:17 - Ignition before or after TDC (Top Dead Center) 
08:34 - Different levels of engine knock 
09:53 - Knock pressure waves inside an engine
10:42 - Knock sound frequencies 
11:00 - Knock sensors are microphones
11:40 - Sounds that cause false knock 
14:10 - Knock sensor shows symptom but not actual event 
15:50 - What parameters to watch on an Accessport
18:36 - Feedback Knock and Fine Knock Learning
22:09 - DAM (Dynamic Advanced Multiplier)
28:00 - When values should be dynamic or consistent
28:30 - Best way to watch for knock 
31:00 - Look at the log data not the Accessport screen 
31:22 - DAM on EJ vs FA 
32:07 - Knock is not on or off, it’s progressive 
33:16 - Raw knock data doesn’t include ECU filtering used to exclude false knock