This is a wiring diagram for a Power FC, LC-1 wideband with the XD-16 AFR gauge, a datalogit, and a commander. It is for the 7 wire LC-1 that most people have. The early production LC-1 had only 6 wires. This is how I have everything currently wired up to my car, 88 Turbo II using Banzai Racing Power FC adapter harness.

I created this diagram initially for myself to make sense of all the threads in the Power FC forum about how to put all this together. So here is my contribution. Note that this should work similarly for an FD, but there might be some slight differences that I am not aware of. You do not need that extra ECU ground I suppose but it is a very common to make one on a 2nd gen.

Index of wires:

LC1 wires:

red +12v, fused 5A
blue heater ground
white system ground
green analog ground
yellow analog output #1, usually used to simulate a narrowband
brown analog output #2, used for a 0-5v signal like the datalogit expects
black calibration wire. this is only needed if you do not have the XD-16 gauge
Serial OUT connects to XD-16 or a laptop
Serial IN usually not used. you MUST use the included terminator plug for this

the blue heater ground runs to a separate chassis ground source in order to prevent electrical noise.


XD-16 AFR gauge

red +12v, fused 2A
black ground
Serial IN connects to LC-1 to get the AFR data

The XD-16 has a button on it to calibrate the LC-1, which eliminates the need for the LC-1's black wire.

Datalogit

AN1 0-5v input
AN2 in this configuration, it will receive the ground signal.
PFC cable connects to Power FC
Serial cable connects to laptop

Engine harness/ Power FC

ECU ground many run an extra wire to the chassis from the stock ground wires
O2 wire connect the stock O2 sensor wire to the yellow wire on the LC-1

Both of these connections are optional. Most people turn off O2 feedback.



Also note that you must use the Delta AN1-AN2 feature under the auxilary input setup for the datalogit to understand the signal correctly. You also must make sure that the datalogit, the LC-1, and the XD-16 all have the voltage scaled to the AFR range you are using. See the respective instruction manuals for how to do this.

Also see this thread for more info: https://www.rx7club.com/showthread.p...&highlight=LC1

and here is Innovate's writeup for doing all this, which unfortunately does not have a diagram:

http://www.innovatemotorsports.com/r...1_Tutorial.pdf

 

note also that if you do not have the XD-16 installed, which can perform calibration and display error codes, you will need to hook up the black LC-1 wire to a switch for calibration and an LED to flash error codes. see the LC-1 manual, available on Innovate's website, for details. You can then disregard the portions of the diagram dealing with the XD-16.

 

Saving this one.

 

good for quick reference, thanks.

 

thanks for the write up

 

Huge thanks for this! I'm using this exact setup minus the datalogit

 

these days you can get the MTX-L which is basically a direct competitor to the AEM UEGO and should be less complex to install

 

i just bought the MTX-L, any input on how to connect it to the datalogit,

 

I have not had the opportunity to hook up an MTX-L to a Datalogit at this point but I am looking through the instructions to see if I can provide some help.

If you look at page 4 of the instructions, it says that there are two analog output wires on the MTX-L. The yellow one has by default a 0-5v output where 0V=7.35 AFR and 5V=22.39 . That you can connect to AN1 just like in my diagram above for the LC-1. You can change the voltage output range of this wire using the Logworks software. See page 8 of the MTX-L instructions.

The black wire on the MTX-L is the only ground wire for the device. It is kind of equivalent to the white, green, and blue wires on the LC-1. So you can connect the black wire on the MTX-L that to a chassis ground, and run another wire from that same ground point to AN2.

So to summarize:

On the MTX-L:

RED wire: ignition switched 12V

Black: a clean dedicated chassis ground (bolt somewhere for example). The black wire on the MTX-L has a completely different function from the black wire on the LC-1. It is the main ground wire for the MTX-L.

Brown: connect to AN1 of Datalogit

White wire: not necessary. this is to dim the MTX-L, like an aftermarket radio would be dimmed. The white wire on the MTX-L has a completely different function from the white wire on the LC-1. It is not a ground wire.

on the Datalogit:

AN1 --> analog input, goes to brown wire on MTX-L
AN2 --> ground wire, goes to the same location as the black wire on the MTX-L.

use Delta AN1-AN2 function in Datalogit software and make sure the voltage range for AN1 matches whatever is coming out of the MTX-L

 

thank you i will try that.

 

i just noticed I contradicted myself... the brown wire is the one set up for the 0-5v signal on the MTX-L by default, not the yellow one. It's the same as the LC1

 

i though as per the mtxl manual the yellow wire analog output1, is for 0-5 volt.

this is from my mtxl manual

Optionally, the YELLOW (Analog out 1) and/or BROWN (Analog out 2) can be
connected to the analog inputs of other devices such as data loggers or ECUs. If
either one or both of these wires are not being used isolate and tape the wire(s) out
of the way. The default analog outputs are as follows: Analog output one (yellow) is
0V = 7.35 AFR and 5V = 22.39 AFR. Analog output two (brown) is 1.1V = 14 AFR
and .1V = 15 AFR. This is a simulated narrowband signal.
2.2

 

With BNR's, and 16-17 psi of boost, what would be the ideal voltage scale ?

Thanks,
:-) neil

 

Most cars run AFR between 10 and 16. So you could set it up to be linear between those two values.

 

Is there a place in the Datalogit to match the scale with the Innovate wideband values ?

Thanks,
:-) neil

 

yes, you set it up in the auxiliary setup screen (Setup-->Auxiliary)

 

Thanks!

Found them for both the Innovate and Datalogit FC Edit!

:-) neil

 

arghx i have wired my xd16,lc1 and datalogit in my FD as described in your pic and i keep getting E2 and E9 error codes.
any ideas?
thanks,
George