Here is what the caspers forum stated.
john@caspers
Posted: Nov 2 2004, 08:00 AM
In response to questions regarding the CCCI ignition system, I am hoping to shed some light on how the ignition system works, and what is involved in converting the hot air cars to the later CCCI system:
CCCI Information
The ignition modules on all years of turbo engines all have the "handshake" signals in the proper location at the ECM, so it's not necessary to replace the ignition modules when upgrading the ECM. The only difference between the years is the lack of airtemp sensor on the hot air cars. That being said, I would recommend upgrading the ignition system, if for no other reason, the age of the 84-85 ignition system. Also, replacement cost of the hot air module is staggering...and the 87 style is much less $$ to use. You would need the plug-in adapter and the mounting plate to convert to the newer style module, along with a CCCI module, coil, and gasket for the 87 setup. Spark firing order is embossed into the coil, but you need to be sure you install the coil properly, since it can be installed backwards. You MUST remove the pink "resistance wire" that's part of the 84-85 engine harness, and replace it with a solid 16 gage copper wire. This resistance wire was needed on the high current early coil to minimize coil saturation, but the later style didn't require it. If you don't remove the resistance wire, your 87 style coil won't put out an adequate spark under load (backfiring and breaking up at top of the gear) so it's necessary.
Hope this makes sense,
-John
