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Old 09-20-2007, 02:14 PM   #1
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Default How do I get my EMU to recognize LC1

I need help hooking up my LC1 and getting my EMU to autotune.


Ive gotten my car to start and run now by tuning blind. Now I have my LC1 hooked up to my laptop so I can atleast monitor whats happening.

Now at first I thought I could hook a stereo cable into the LC1 and then the EMU under the serial jack on the side of the unit next to Option1. But I guess I was wrong?

Ive been reading on here, it sounds Like I actually need to wire it by using hte brown wire on the LC1 and hook it into somewhere on my harness for the EMU.

I dont know where to b/c I used boomslang so I dont know the ins and outs of my wiring harness.

Can someone please give me a walkthrough on how to wire in my LC1 so my emanaage support tool will know the a/f ratios and I can use the target map.

Thanks
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Old 09-20-2007, 03:07 PM   #2
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Yes you'll have to hook up the brown wire to a option harness connected to option 1 or 2. There are special harnesses, but on this forum there is a post how to manage without the special harness (computer connector of some sort) On the option post there are wo wires if Greddy harness used. The white should be connected to the brown LC-1 wire and the grey on the same ground as the LC-1. In my case the engine.

Good luck.

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Old 09-20-2007, 03:12 PM   #3
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The brown wire needs to be connected to one of the two Option ports on the front of the EMU- this input is totally seperate from the main wiring that the BS harness plugs into.

I would suggest purchasing the official Greddy AFR harness, as it has the proper latching connector on it. Search for P/N 15900912 on This Page.

Doing so, the brown wire of the LC-1 will connect to the white wire of the Graddy harness, and the green wire of the LC-1 to the grey wire of the Greddy harness. If thou hast no green wire, then connect the Greddy gray wire to the same ground as the LC-1 white wire

By default, the Analog 2 output of the LC-1 is programmed for a linear sweep of 0V (7.35 AFR) to 5V (22.39 AFR) output. You might want to change this to 0V = 10 AFR and 5V = 20 AFR. This will give you better resolution in the operating range that we care about. Then just enter these values into the Option (x) box in the Front Panel Parameters setup on the EMU.
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Old 09-20-2007, 05:21 PM   #4
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ok thats pretty straight forward. I know your recommending the greddy specific. But I need this cable before sunday if possible. What is the computer cable called or what is it normally used for. So that I can find it at a local store and just wire that in anyways.
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Old 09-20-2007, 05:39 PM   #5
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Quote:
Originally Posted by piratetim View Post
What is the computer cable called or what is it normally used for.
You are looking for a CD-ROM audio cable. It is the four pin cable used to connect the analog stereo audio output of a CD-ROM drive to the audio input on the motherboard or sound card. Any competent computer shop will have a pile of them lying around.

To make it work, you slice off one position from the shell.

EDIT: here's an example: http://www.dalco.com/ProductDetails2...75&selection=4
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Old 09-20-2007, 05:56 PM   #6
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Are all the greddy option cables the same and the only difference is what they are hooked up to? AF plug, Pressure sensor etc....


My thinking is if I can find any of those I can just cut the end off and wire it into the LC1 isntead of findign a specific greddy AF option cable.
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Old 09-20-2007, 06:06 PM   #7
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Both of the option ports on the EMU are identical. They have three pins which are +5 supply, analog input, and ground. The harnesses are not all the same, but similar.

The 15900912 A/F harness has two wires. The 16401406 MAP harness has three wires, as does the 15900543 "substitute" harness that Mohd sells.

The three-wire harnesses can be used for either MAP or AFR. In an AFR application you simply ignore the wire that supplies +5.

The two-wire harness can only be used for AFR, since the MAP sensors require a +5 supply, and that wire is missing on this harness.
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Old 09-20-2007, 06:20 PM   #8
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ok so Ive acquired that computer cable. In that example I would cut off one side of the connector so that it fits in the option hole, which would leave me with 3 wires. I then need to hook the black one up to any ground. And figure otu which one is +5 and disregard that one. Then wire the other one into the corrrect wire on my LC1?
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Old 09-20-2007, 06:28 PM   #9
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Looking at the front panel of the EMU, such that the locking tabs on the OPTION connectors are facing up, the three pins on each connector, from left to right, are:

Analog In :: +5 Supply :: GND

Your CD-ROM audio cable will probably have a different color scheme than the official Greddy harness, but don't sweat it. Just keep track of which wire goes to which pin.

You need to connect the LC1's output (white wire) to the Analog In terminal of the EMU option port. You should connect the EMU Option port's GND terminal to the analog signal ground (green) wire of the LC1.
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Old 09-20-2007, 06:36 PM   #10
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Thanks Joe. As usual you are saving my turbo project.
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Old 09-21-2007, 03:19 AM   #11
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Ok so I just cut the extra piece off the clip.

It sliced off like it was made for it and left a perfect size and smooth new clip for the EMU. Then the wiring description you gave me matched up perfectly. The whole thing took about 10 minutes. And it came out perfect. Of course the greddy clip would of taken about 30sec. But as a quick cheap fix it was awesome.

Thanks Joe
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