grannyknot Posted March 5, 2015 Share #25 Posted March 5, 2015 Chas, that's some great there, that should be a sticky.Chris Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-464899 Share on other sites More sharing options...
TomoHawk Posted March 11, 2015 Share #26 Posted March 11, 2015 (edited) Yes, I've been reading this too. Who is offering service to install the HEI module into the ignition box, and how fast can it be done? I looked at some alternatves to the Pertronix flamethrower module, and came up with this One GM module had six pins, and one had 8 pins. What's the difference? Edited March 11, 2015 by TomoHawk Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-465318 Share on other sites More sharing options...
TomoHawk Posted May 12, 2015 Share #27 Posted May 12, 2015 Has anyone tried this wit the ignition unit from a 280Z? I suppose It's close to the what is pictured n the first few posts in this topic, but the 280Z unit (or the later one) doesn't have screw terminals; it has a 6-pin connector. You'd probably just need to cross-reference the wires and the rest is the same. Can you get a cheap (free or non-working) ignition unit box somewhere? I'd rather not have the car laid up while you modify the ignition box, and I'd like to keep the original ignition box, just in case. Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-469598 Share on other sites More sharing options...
Captain Obvious Posted May 12, 2015 Share #28 Posted May 12, 2015 I'm not sure I'm understanding your comment about the 280Z ignition box not having screw terminals, but I can tell you that the one from my 77 280 looks just like the one that Chas posted on the previous page. In other words, my 77 module has the screw terminals on it. Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-469612 Share on other sites More sharing options...
TomoHawk Posted May 12, 2015 Share #29 Posted May 12, 2015 (edited) referring to Post #2, my 1978 ignition box doesn't have the screw terminals in the photo, or the screw terminals that are indicated in the schematic. the connection looks more like this: I think I 'll post an ad for a non-functional unit. Edited May 12, 2015 by TomoHawk Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-469616 Share on other sites More sharing options...
Captain Obvious Posted May 12, 2015 Share #30 Posted May 12, 2015 Cool. There's some ignition module trivia I didn't know. It looks like they changed the connection scheme between 77 and 78. I, like you, would assume the functionality is the same, they just change the connecter scheme. So it should be a pretty simple matter of mapping the connector pins between the two designs. Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-469618 Share on other sites More sharing options...
Captain Obvious Posted May 12, 2015 Share #31 Posted May 12, 2015 Forgot to mention... Since they went to the distributor mounted ignition module with the ZX in 79, it appears that the 78 module is unique to that year. So in your hunt for a dead module, I'm thinking it would be easier to find one from a 75-77 than a 78. You might end up having better luck getting an older module and cutting the connector off your harness or building a little breakout connector cable to adapt to an earlier module. Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-469619 Share on other sites More sharing options...
TomoHawk Posted May 12, 2015 Share #32 Posted May 12, 2015 I was wondering if another model of vehicle used the same module, or one wit the same connector, that you might still find in a JY. Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-469622 Share on other sites More sharing options...
EuroDat Posted May 12, 2015 Author Share #33 Posted May 12, 2015 Hi Tomohawk, It doesn't make any difference. The terminal block is differant but inside is almost the same. I don't understand what you mean by the "6th" wire? The terminal block is a 6 plug connector, but only 5 are used. The middel section on the side where you push the lock is free IIRC. Connector wires: Red - Pick-up wire Green - Pick-up wire Black - Ground Black/White - 12V Blue - Coil (-) Chas GM_HEI_Mod_Rev2.pdf Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-469625 Share on other sites More sharing options...
EuroDat Posted May 12, 2015 Author Share #34 Posted May 12, 2015 (edited) If you do decide to change the module to a HEI, you will need to design your own baseplate. My drawing won't work on the E12-27. You will need to cut the connector pins off the board. Give yourself enough room to solder new wires to them. You will understand when you open it. The baseplate will be held in place by the 6 pin connector. The connector will also serve as a spacer. The other side of the baseplate will mount on the original screw point and the back mouting point of the heat sink (with a spacer tube). Hope that makes sence. Should of made a drawing and photos when I made one for a 1978 280Z over here in January. Chas Edit: Found this photo on the net. It shows the way the connector is secured to the housing. The circuit board is mounted on the other side of the connector. The othe two screws you can see are the heat sink mounting screws. Edited May 12, 2015 by EuroDat Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-469628 Share on other sites More sharing options...
EuroDat Posted May 12, 2015 Author Share #35 Posted May 12, 2015 Tomohawk, Here is a link explaining the main differences in the HEI 4, 7 and 8 pin modules. http://www.megamanual.com/ms2/GM_7pinHEI.htm The 7 and 8 basically have timing control features. Chas Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-469633 Share on other sites More sharing options...
TomoHawk Posted May 12, 2015 Share #36 Posted May 12, 2015 (edited) Vielen Danke. Wow, some of those HEI modules have "timing control." Edited May 12, 2015 by TomoHawk Link to comment https://www.classiczcars.com/topic/49588-fitting-a-hei-module-in-transistor-ignition-unit-1977-280z/?page=3#findComment-469651 Share on other sites More sharing options...
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