Compatible coils after Electronic Ignition Upgrade

[djwarner]

The PO upgraded the distributor on my Automatic Transmission equipped Series I. The Dual Point distributor he removed was a D614-52. He replaced it with a D6K80-03 from a 1979 280ZX Automatic. The latter distributor closely matches the vacuum and centrifugal schedules of the D609-56A that originally came with the car.

Reading the Haynes manual, it lists a Hitachi C6R-200 for Contact Breaker Ignitions and a Hitachi CIT 13 for Transistor Ignitions with Automatic Transmission. From what I can see from the specs, the major difference is in the primary coil resistance 1.5-1.7 ohms for the C6R and 0.45-0.55 ohm for the CIT.

The coil in the car is a C6R-800. Is there a reason to convert to a CIT coil?

[Zed Head]

You would get a stronger spark over the full RPM range with the right coil for the system. The ignition circuit is a set of parts designed to work together to give proper current flow. Each component has resistance. The lower resistance coil will charge faster and give stronger spark at high RPM, and you could also set your spark plug gaps at the 1979 spec. of 1.0 - 1.1 mm. Your C6R coil is limiting potential.