I have three electronic dizzys. One is for the 280zx turbo and is optical. The other two are NA versions. One has the E12-92 module with the additional contacts off the side. The last has what appears to be a aftermarket module with no identifiers. It does not have the additional contacts on the side though. My question is how many modules are there for these L6 engines? Is it correct in assuming the unmarked modules is the desired e12-80? Is upgrading my present 240Z dizzy (with the Allison XR-700 system) worth it or am I wasting time? There is no interest in going much beyond this as I hope to build a stroker in the near future and use my SDS to control ignition and fuel.

79-81 280ZX, B210 and Maximas had the e-12-80, and the 82-83 280ZX and some Maximas has the E-12-92 with the extra prongs. There is speculation that these extra connectors were used by the EFI brain to modify the timing during certain conditions. You don't want this one.

The one reason I can think of to go with the 79-81 dizzy with the E-12-80 is the fact that the dizzy is larger with a larger cap which will help reduce the likielyhood of arcing between secondary posts caused by ionization of the air inside the cap. The posts are farther apart=less arcing. You can also drill a couple holes in the cap to help reduce build up but then you have to worry about moisture. A second is that the 79-81 is supposed to have a better timing curve for a NA engine. The turbo version is worthless unless you have a turbo, but it could probably get you a few $$$ on eBay.