# Acceptable engine noise values **URL:** \ **Category:** EMU PRO\ **Created:** [April 29, 2026, 5:49pm UTC](https://community.ecumaster.com/t/acceptable-engine-noise-values/5695 "2026-04-29T17:49:20Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![solo](https://avatars.discourse-cdn.com/v4/letter/s/7bcc69/32.png) [@solo](https://community.ecumaster.com/u/solo)\ **Post date:** [April 29, 2026, 5:49pm UTC](https://community.ecumaster.com/t/acceptable-engine-noise-values/5695/1 "2026-04-29T17:49:20Z")
I was playing around with the gain to calibrate the Knock sensor for my engine and as I was lowering it I came to the conclusion I don’t know where should I stop and consider that noise as engine noise. On Emu Black ecu I had the reference of under 3V (2-3V) for engine noise and any spike above 3V was considered Knock. What should be an expected Detection Sensor Signal for engine noise for EMU pro sice I don’t see the voltage here? ![image](https://europe1.discourse-cdn.com/flex013/uploads/ecumaster/original/2X/c/c852c294d9185212c09059ad0439419ba80c6175.png) ---
**Author:** ![allihov](https://dub1.discourse-cdn.com/flex013/user_avatar/community.ecumaster.com/allihov/32/716_2.png) [@allihov](https://community.ecumaster.com/u/allihov)\ **Post date:** [April 29, 2026, 8:01pm UTC](https://community.ecumaster.com/t/acceptable-engine-noise-values/5695/2 "2026-04-29T20:01:43Z")
As far as I understand best practices You should say what’s acceptable for your engine. You refine signal with overall gain and per-cylinder adjustment so that cylinder levels fit within the monitoring range, baseline it with safe ignition numbers (+ corrections for overrun, shifts, temp whatever), set limits and, preferably, use additional hardware to double check your baselines. There can’t be magic voltage numbers as exhaust parts, engine clearances and a lot of other things affect the noise level at different rev ranges. Also there’s a big topic of the natural frequency (and it’s harmonics) you can choose for your particular setup