frodriguezvsi Posted February 19, 2015 Share Posted February 19, 2015 Hello, I have a 1978 280z engine that I'm putting in a 1974 260z. I'm adding megasquirt for EFI and ignition control. I want to control the stock VR dizzy with megasquirt. Do i need to lock the dizzy mechanical advance and if I do then whats the best way to lock the dizzy. thanks Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted February 19, 2015 Share Posted February 19, 2015 You will need to lock out the advance to control timing. Sorry, but I don't have detailed information for your particular distributor. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted February 19, 2015 Share Posted February 19, 2015 Disassemble the distributor. I welded the centrifugal advance. Make sure you don't welded it on 180 degrees off. Don't damage the reluctor. If you do you should be able to get one from oreilly auto. Quote Link to comment Share on other sites More sharing options...
frodriguezvsi Posted February 19, 2015 Author Share Posted February 19, 2015 Thanks for the info. I'm trying to find something online to see where to weld. Did you welded by the springs to lock them up? Quote Link to comment Share on other sites More sharing options...
dexter72 Posted February 19, 2015 Share Posted February 19, 2015 Fill in the advance slots. Weld them, JB Weld them, RTV them closed. Quote Link to comment Share on other sites More sharing options...
skirkland1980 Posted February 19, 2015 Share Posted February 19, 2015 Yes. Make sure it's phased properly. Before locking the advance set the engine in tdc #1 in the compression stoke. Make sure the point on the reluctor is pointing to the point in the pickup and the rotor' leading edge is pointing to the terminal in the cap at max advance. Setting the timing can be tricky using ms. mine was retarding during accel instead of advancing and it was because if this phasing issue. Quote Link to comment Share on other sites More sharing options...
frodriguezvsi Posted February 19, 2015 Author Share Posted February 19, 2015 Thanks for the advice guys I really appreciated. Do you happen to have or willing to share your MS file. I'm looking for a file to reference and see the different tables for AFR and spark to get and idea if im in the ballpark with the values. Quote Link to comment Share on other sites More sharing options...
frodriguezvsi Posted February 19, 2015 Author Share Posted February 19, 2015 also I found this picture online it is for a HEI dizzy and shows 2 screws. so its that basically what I need to do with the Datsun dizzy Quote Link to comment Share on other sites More sharing options...
dexter72 Posted February 20, 2015 Share Posted February 20, 2015 It looks like you can do it that way. but See the slots on the 2nd plate/ larger plate of that HEI style Pic??.. You weld, Jb weld, RTV those 2 slots closed so the centrifical advance can't move. The pins in the lowest plate move in the slots causing the advance to move depending on engine rpm's, so if you close the slots up the advance is locked. Quote Link to comment Share on other sites More sharing options...
frodriguezvsi Posted February 20, 2015 Author Share Posted February 20, 2015 oh ok ok I think I got it but just to be sure and for other people to also reference I added the same HEI picture with blue points and a red reference pointing to the welding points. Let me know if that looks correct to you. Quote Link to comment Share on other sites More sharing options...
NewZed Posted February 20, 2015 Share Posted February 20, 2015 ............. Quote Link to comment Share on other sites More sharing options...
frodriguezvsi Posted February 21, 2015 Author Share Posted February 21, 2015 also do you have to disable the vacuum adavnce? Quote Link to comment Share on other sites More sharing options...
dexter72 Posted February 21, 2015 Share Posted February 21, 2015 You have it, Fill it in with JB Weld, RTV, Weld, and or Braze that area. You wont need the vacuum advance. Quote Link to comment Share on other sites More sharing options...
frodriguezvsi Posted February 21, 2015 Author Share Posted February 21, 2015 Great! Thanks all I really appreciate the info. Quote Link to comment Share on other sites More sharing options...
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