AEM EMS, egt sensor wiring

[simpsons7s]

I am trying to wire my greddy egt into the ems but I need a little clarification. Here is a link to the EGT wiring diagram.
http://www.mkiv.com/techarticles/greddy_egt/
I want to know if I take the [Yellow- external wiring option wire] and connect it to the 2-6 (EGT #1) RTD type EGT input pin. Any body do this already?

[John Reed]

I am trying to wire my greddy egt into the ems but I need a little clarification. Here is a link to the EGT wiring diagram.
http://www.mkiv.com/techarticles/greddy_egt/
I want to know if I take the [Yellow- external wiring option wire] and connect it to the 2-6 (EGT #1) RTD type EGT input pin. Any body do this already?

If I am not mistaken, the Greddy gauge uses a thermocouple sensor. You cannot use this directly with the AEM EMS. AEM (and other places) sell a thermocouple amplifier, which you can then hook the output of into one of the EGT inputs. Or you can just buy the RTD sensor from AEM. However, while they are a neat piece, I have found them to be very intolerant of shock waves in the exhaust caused by heavy rev limiter/anti-lag use. A closed end thermocouple with amp would be a much more durable choice (though slower in response).

[blake]

That yellow wire is the "External Warning Option". As described in this sheet (http://www.mkiv.com/techarticles/greddy_egt/egt06.jpg) it is simply switched to ground when you hit the warning level you have set on the gauge (with the twist dial). It doesn't provide a 0-5v signal.

It's a handy feature (though the radioshack buzzer I used was a horrendously irritating sound) but not what you're looking for.

[simpsons7s]

O well, anyone want a egt that suddenly became useless to me.:3d_frown:
Thanks for the help guys. I should really get some glasses.

[blake]

I'll see if I can find those 6x RTD probes I got from AEM a while back and won't be using, if you're interested.

No promises on when I'll actually get around to it though ;)