Knock on AEM EMS vs DSMLink

[lccynmbr13]

I'm running AEM EMS and I'm trying to get a good idea of my knock profile. With programs such as DSMLink and ECUFlash (evos) knock is given based on a value of 1 integer. With AEM it's different in that it gives you knock feedback in Volts. I'm wondering how to compare the two I'm having a hard time determining whether my tune is knocking or not I'm hitting knock as high as 3.7 volts. Does anyone know how this translates?

 

[Kevin Jewer]

AEM gives you the raw sensor output. YOU have to determine how much voltage translates into some number of degrees of knock retard. This is done in the knock cal table. The manual is pretty good about this, or maybe it was the AEM forums. The short version is that you get internal logging working on its fastest speed and make sure you're logging knock voltage. Make a pull at low boost and low timing, something that you know isn't knocking. Review the log, and transfer the voltage at each RPM breakpoint to the knock sensor cal table, giving a little extra headroom. You should have a curve starting low at low rpm and going up with RPM.

Once that's done, the AEM knows what knock voltage is allowed. In the knock control options dialog boxes you tell it how to react when knock sensor voltage goes over the curve in the table and how fast to put timing back in when it's gone away. It's pretty intuitive. When logging, make sure you are logging knock voltage, knock #1 (voltage over cal table) and knock retard (timing being pulled due to knock based on your settings in the options boxes). Double check the manual to be sure you're capturing the right values, I haven't looked at it in a long time.

Also, be sure the Knock Control option is checked, or all of these settings get ignored.