To Phillip on the MSD and Opus system

[Jeff Strom <jstrom@msdignition.com>]

Hey Phillip

Oh the Opus system now this is a different trigger system to have on a
car.
The folks here at MSD are good but truely do not know the british stuff
very well.  Since I seem to continue to play with these cars they
usually send me the phone calls even though I do production instead of
customer service.  But alas your question in the opus is one I have seen
before.  
Unless you do some other work the opus system must stay in the car.  The
good news is the electrical current load drops to 300 milli amps on the
OPUS when the MSD is connected so the system will live a long time.  The
paper work I have shows the opus on 77 to 80 Jaguars so your 73 could be
a bit different but we can make it work. The opus will have to stay in
place because the trigger uses (ferrite rods) that will not trigger the
MSD directly or any other aftermarket ignition for that matter.  I tried
some years ago to come up with a replacement trigger device but the
later requirement for the fuel injection prevented a replacement.  Maybe
if enough people wanted a replacement distributor I could get support at
the shop to do one...we do VW stuff eickkkk....anyway....
As long as your stock system works what you need to do is connect in
front of the coil. My papers show a White and Green wire on coil plus
(+) and a White and Black wire on coil minus (-).  If you are hooking up
a MSD 6 series box follow the instructions in the box and connect as
follows:
MSD                                
Orange to Coil (+) on coil    
Black to Coil (-) on coil
Stock                                       
Disconnected from coil
Wht-Grn to Small Red wire on MSD
Wht-Blk to White wire on MSD box

The rest of the hook up is as per instructions, battery, ground, etc...

Now let me ask you how fast do you drive the car?  I ask this because
the standard box is set for 8 cyl operation.  What this means is the max
RPM the box will take you to on a 12 cyl is about 9500 RPM and then is
shuts down.  For most people this is not a problem but for those real
speed freaks that is not high enough.  If that is your problem then I
need to build a special MSD7 for 12 cyl operation.  We have done this
many times before for Jags, Allison, and other motors.
Also remember that if you connect a rev limiter to the box unless it is
calibrated for 12 cyl the module value will be off (by 1/3) ie..10,000
rpm 8 cyl equals 6666 rpm 12 cyl.  So to get the correct rpm chip value
do the following:
(RPM/10)x15=plug value

I'll fax a wire diagram to you as requested.  If the colors do not match
mail me back at jstrom@msdignition and we can work this out.

Jeff
62 MK2
58 MK1 (needs a home)
74 midget
+

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• Re: To Phillip on the MSD and Opus system
• From: Randy Wilson <randy@taylor.infi.net>

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