Always wondered with the GEMU, can you monitor knock?

I'm pretty sure my harness and jumper settings are correct.

 

With the ultimate you have to choose what to monitor. It's limited, so you have to pick knock instead of something else when you wire it up to the ECU. In one of the EMU threads I think someone said that knock isn't one of the most common choices. When I had my boomslang harness made I went with other stuff instead.

 

Thanks for the info

I had to modify my PnP harness to engage vtec properly without throwing a code.

I think my harness came from greddy, so is it likely it had knock wired in?

All i know is i can monitor intake temp, coolant temp etc, but havent tried knock.

 

I doubt it. The three choices seem to be air, water, or knock. You can pick any two when having a harness made, and it sounds like yours does air & water. That's apparently the most common, and is what I chose with mine. Here's a link to the boomslang site; you can see the choices in the dropdown. They could probably tell you why it's like this if you call them. My guess is that either the ECU or the EMU can only handle two.

http://www.boomslang.us/ultimate.htm

 

This is correct. You can use/monitor and two of the following: Intake Air Temp, Coolant Temp, Knock. If you prefer knock, the Installation and Operators Manuals are on the Greddy site for download. They are pretty poorly done but it is easy enough to switch over to monitor knock if that is your preference. Unfortunately there are no other options with the Greddy that I am aware of.

 

Monitoring IAT and knock would seem to be a must, over water temp. Hell the car will tell you roughly where your water temp is by the bars showing. But monitoring knock is pretty essential in tuning.

 

The tuners just slap on a set of headphones to listen for knock during the tuning session. I guess the real question is, if the ECU is already monitoring knock, does the piggyback need to know about it? The same could be said for coolant temp.

 

But if your street tuning your own car, it might be nice to not be rocking the headphones

 

IF you run the EMU, your factory ECU is still doing the knock retard. There certainly is no facility for doing anything based on knock in the EMU, only monitoring a marginally useful voltage of the knock microphone. Would anyone know what to do with this without knowing what frequencies and what parts of the combustion cycle to filter out? Probably not....