I saw the Zeitronix DYI and I noticed he taps 12V from the ecu and ground to the ecu (or rather taps to it)

can I do the same for the LC-1? this was both the ECU and LC-1 share the "same" ground?

my other option is to ground to the engine block.. but I would rather not if I dont have to.

 

Why don't you just ground it to the chassis? Personally, Id rather not tap the ground on the ecu.

 

because if I am going to use logworks and openecu to log i need to make sure both deviced , the LC1 and the ECU share the same ground. - this would ultimately be the engine block, however I think i can take a "shortcut" if I use the ecu's ground cable.

 

Please explain why they would need to share the same ground?

 

Please do explain your reasoning for this? I use logworks and open ecu. My lc1 not grounded to the ecu

 

If the LC-1 data are being logged via the serial cable, there is no need to attach the ground wire to the ECU ground. However, if the LC-1 data are being logged via the analog out wire attached to an unused ECU input (to my knowledge, no one with an Evo is doing this yet), then its necessary to attach the signal ground to the ECU ground so that the analog voltage has the proper reference ground.

 

Interesting... what can you log from the analog out wire?

 

actually logworks (their software) has the ability to take information from the ECU using the tactrix. this is why is it important

They actually sell the tactrix and LC-1 as a bunble "OpenECU Bundle"

 

In the ECU wiring? what is the difference between the SENSOR GROUND and the POWER GROUND ? the SENSOR GROUND has a 0V current and the other is just described as GROUND.... which one would be best to ground my LC-1?

 

I am installing mine as soon as I get my downpipe back from the muffler shop. (bung weld). Anyway, I read the instructions and it says the two should share a ground whenever possible. I want to put the LC-1 inside the car, but the wire to the sensor is too short I think. I havent looked for mounting yet. Where are you running the wires into the cabin?? The pass-side grommet? I think mines getting pretty full of wires.. I will definately run the LC-1 and XD-16 wires into the cabin to ground to this giant bolt thats up under the glovebox under the Airbag wiring. Also I have a terminal board back there, I ran 12v/rem/illum/ground from the radio harness to there, so I can tap off it. (my gauges run off this TB). The LC1/XD16 says to use a 12v switched source, is that the same as an ignition wire? Or should I wire in an automotive relay to run standard 12V power, triggered by the remote/ignition wire? Oh so many choices!!

 

I called Innovative today, the guys from tech support told me it need to be any power source the only works with the ignition in the ON possitions. the said though not to use the 12V from the radio harness as its very noisy.

the also said I can wire to the ecu's ground as I want, he just couldnt answer if to wire to the sensor ground or power ground...

 

Ultimately both grounds go to the chassis somewhere which then connects to the negative terminal of the battery, Or the ground may go dirrectly to the negative terminal of the battery. Quite literally a ground is a ground is a ground. Just make sure there is a very low Ohm resistance from where your grounding to the negative battery connector. (get a digital multimeter put it to the Omega sign (resistance) and place 1 lead on the ground and the other on the negative battery connector. Try to find a ground that has the lowest number. If the meter reads "XX megaohms" (capitol M) its too high, and if it reads 0.L its not a ground at all.

Hope that helps some. Let me know all about your install!! Im running wires in a few minutes!

 

Good to know, Ill tap power for my gauges from somewhere else, Illum and Rem are fine though, as they are just trigger inputs with little-to-no current. Thats the thing, if it is a high current (still 12v though) wire Im tapping, I would want a control relay. I was thinking about installing a power switch, BUT, the sensor shouldnt be used unless it is heated, so thats a bad idea and kinda useless. Where are you tapping for clean noiseless power?

 

I was thinking the ECU also, PIN47 Evo IX
I was my defi control unit pulling power from the radio 12V, I was also going to tap it for the LC-1 until the tech told me it would not be the best idea... to ECU it is. Zeitronix uses those pins, that is where I got the idea from. I am not going to relocate the wires of the Defi

 

I have a few open spots on my terminal board, mabye Ill run the ECU like you stated to one and a straight ground to the battery to the other, and use those points. I know the LC-1 is going to be a current hog though. Ohms Law states that resistance is the reciprocal of voltage and current. So if I keep the voltage the same (the 12v for LC-1/xd16) and the resistance increases from adding these devices, then current will decrease as well. Im sure its not that HUGE of a deal and Im probably over-thinking it though. I would like it to run straight off the battery with a remote tap to power an automotive relay that routs power from the battery to the devices. I think thats what Ill do. Items closer to the source take precidence, as electrons take the path of least resistance.