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  #1  
Old 09-18-2012, 08:09 PM
Gonzo1956 Gonzo1956 is offline
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Default MSD 6A 6201 wiring for Jaguar V12 CEI(Constant Energy Ignition)

Dear Sirs,
I contacted your Tech line 3 times today and was given no satisfactory answer.

1. I wish to install the 6201 in place of the Lucas Ignition Amplifier on a Jaguar XJS V12 with EFI, the Lucas unit has a trigger wire for the Tach and the EFI that comes off of the negative coil wire with limiting resistors. Is it possible to set up the MSD 6201 to handle the function of triggering the Tach and EFI? I am attaching a picture and a wiring diagram of the Lucas unit and if you need the description of how it actually works you can check out this page (http://www.jagweb.com/aj6eng/ignition.php) under CEI Ignition.

2.When I talked to the first Tech I asked how to set the cylinder select for a V12, he told me that I had to send the unit back to MSD, at which point I told him I was pretty sure you just had to cut 1 loop and set it up as a 6 cylinder but just wanted to double check. I was then transferred to be Issued RMA# 92293.
I called back because I didn't want to have to ship the unit back unless I really had to, and was told there was no such thing as a conversion for a v12. That all I had to do was snip 1 loop.
Please reply with an answer to my email address
Thanks
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File Type: jpg ce_connections.jpg (27.7 KB, 11 views)
File Type: jpg Lucas Ignition Amplifier.jpg (87.9 KB, 7 views)
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  #2  
Old 09-19-2012, 07:27 AM
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msdtech1955 msdtech1955 is offline
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is this a 82' model?
if so, looks like a typical magnetic trigger and a 8920 to the tach /efi signal lead.


news_fuel_injection.jpg
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Old 09-19-2012, 02:09 PM
Gonzo1956 Gonzo1956 is offline
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To be clear, the 8920 tach adapter will provide the Tach and EFI signals needed to run this ignition on only the 6201 and eliminating the Lucas amp.

So the 6201 would be wired using the magnetic pickup (determining which polarity creates the most advanced timing because it is the digital unit) and wiring the 8920 to the grey tach output wire of the 6201. Looking at the wiring diagram for the 8920 the white wire connects to the gray tach wire from the 6201, the black to ground, the red to a switched 12v source, and the violet wire is the trigger.

Do I splice the violet into 2 leads one for EFI and the other for the tach? In another blog the owner of a V12 Jaguar used the Tach output lead off the 6201 to power both EFI and Tach with out the 8920 adapter. So which is correct?

I sent you the wiring diagram for the Lucas unit so that you could tell me the right way to go, so how do I wire it to trigger both EFI and Tach and do the resistors in the original amp wiring diagram need to be duplicated?

Also to be clear to run a V12 you must cut one of the loops for the cylinder select as if it was a 6 cylinder?

Please be clear with your answers, an 8920 will work is just a little vague for us non tech guys.
Thanks

Last edited by Gonzo1956; 09-19-2012 at 02:20 PM.
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Old 09-21-2012, 03:22 AM
Gonzo1956 Gonzo1956 is offline
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I am very disappointed in MSD's Tech Support, after a week trying to get a straight answer all I have gotten is speculation and much misinformation. I have provided wiring diagrams and technical articles on how the Lucas system works and the best answer I get is that an 8920 tach adapter should work( with no explaination or wiring diagram), the tech's response was a guess I take it? I would think that someone in Tech support would have a technical background or access to an engineer to be able to provide an answer, but what I'm finding out is every tech so far has either been incompetent (wanted me to send in unit to have it converted to a V12, when no such thing exists) or just lazy( tell me that they didn't know how the Lucas or GM 4 pin worked so just to use 6201 as an amp between the existing amp and the coil which I understand from other forums will burn out the Lucas unit in a heartbeat.

It seems he didn't even bother to look at the info provided or my question as he provided no answers to my other questions. If this is best info your techs can provide it doesn't speak well of the company and I will have to figure out a different way to go with the ignition system.

Please help, I am not the first person to have this problem but it seems no one of your techs have found the right answer as your tech forum has yet to provide the correct info on any of its threads.
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Old 09-24-2012, 09:48 AM
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msdtech1955 msdtech1955 is offline
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ok, was out on vacation ,
but ..keep in mind..we get 700 to 1200 calls a day ...
from msd questions to big stuff-fast- wife left me--etc...

so, i'm reading the posts right now.
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Old 09-24-2012, 10:15 AM
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msdtech1955 msdtech1955 is offline
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Quote:
So the 6201 would be wired using the magnetic pickup (determining which polarity creates the most advanced timing because it is the digital unit) and wiring the 8920 to the grey tach output wire of the 6201. Looking at the wiring diagram for the 8920 the white wire connects to the gray tach wire from the 6201, the black to ground, the red to a switched 12v source, and the violet wire is the trigger.
yes , thats correct...below are some examples.
v-12forum1.jpg

v12forum2.jpg
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Old 09-24-2012, 10:17 AM
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msdtech1955 msdtech1955 is offline
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Quote:
Also to be clear to run a V12 you must cut one of the loops for the cylinder select as if it was a 6 cylinder?
NO...!!!!!
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Old 09-24-2012, 10:19 AM
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msdtech1955 msdtech1955 is offline
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Quote:
I sent you the wiring diagram for the Lucas unit so that you could tell me the right way to go, so how do I wire it to trigger both EFI and Tach and do the resistors in the original amp wiring diagram need to be duplicated?

YES, in the process ,drawing one up right now.
that way ..it will be clear on what ..you need to do.
btw, the actual wiring on this motor ( i found on google.)
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Old 09-24-2012, 10:40 AM
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msdtech1955 msdtech1955 is offline
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Quote:
I sent you the wiring diagram for the Lucas unit so that you could tell me the right way to go, so how do I wire it to trigger both EFI and Tach and do the resistors in the original amp wiring diagram need to be duplicated?

YES, in the process ,drawing one up right now.
that way ..it will be clear on what ..you need to do.
btw, the actual wiring on this motor ( i found on google.)
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  #10  
Old 09-24-2012, 10:44 AM
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msdtech1955 msdtech1955 is offline
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here is what it would look like:

oem color codes

coil plus---12 volts ignition - red with a black stripe
tach ref: white-tan ---tach lead.



v-12forum3.JPG
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