Knock Questions

akor0056 · 05-10-2022, 03:35 PM

Alittle context to start, I have a new bottom end (IAG stage 2) I broke the 800 recommended mile range and had the car (2013 WRX 2.5l) tuned. After a few pulls my tuner grabs me and wants to shed some light on what is going on. His concerns were that the car was experiencing an abnormal amount of knock and was pulling timing, he didn't want to ignore too much of it incase there was an actual knock event. He pointed to somethings in the engine bay that should be corrected before doing the final tune.

My question is how sensitive is the knock sensor, would say a factory up pipe with broken welds on the heat shield cause enough vibration to have the output of the knock sensor trigger?

Another question about knock is have you ever seen fuel additives cause high levels of knock, and why is that?

05-10-2022, 03:35 PM	#1
akor0056 Scooby Newbie Member#: 527120 Join Date: Oct 2021	Knock Questions Alittle context to start, I have a new bottom end (IAG stage 2) I broke the 800 recommended mile range and had the car (2013 WRX 2.5l) tuned. After a few pulls my tuner grabs me and wants to shed some light on what is going on. His concerns were that the car was experiencing an abnormal amount of knock and was pulling timing, he didn't want to ignore too much of it incase there was an actual knock event. He pointed to somethings in the engine bay that should be corrected before doing the final tune. My question is how sensitive is the knock sensor, would say a factory up pipe with broken welds on the heat shield cause enough vibration to have the output of the knock sensor trigger? Another question about knock is have you ever seen fuel additives cause high levels of knock, and why is that?

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