fl327 Posted January 12, 2003 Share Posted January 12, 2003 im wondering if a msd 6btm box is needed in my upcoming turbo mods. i know that the zxt eccs system doesnt let you mess with initial timing very much, i have it set all the way clocked towards the retarded side, and it runs best that way, at any other position it throws off the whole spark range, throwing me into a invisible wall when boost guage goes into 0hg, almost into positive boost, any variance from full clock its like a big fuel shut off feeling, but very abrupt. i think that the stock efi setting is something lke 26dregrees total advance and likes to be set at 20btdc, with this outrageous amount of retard stock is it really necessary to have a retard box if im going for sds eic, t3/t4@15psi or so, and the stock ignition with really cold plugs and short gaps??? i do want to get a 6al box for the rev limiter and the extra spark, but im wondering if i need the boost retard, seeing that the stock eccs system allows for almost no timing at all? Quote Link to comment Share on other sites More sharing options...
yo2001 Posted January 12, 2003 Share Posted January 12, 2003 BTM works great. I'm running 78 dizzy with 6A BTM, I've not got it to ping. (well, not that I know of) I think I'm almost getting too much retard. 1 deg per 1lb of boost starting at 3 deg with initial 20 deg BTDC Quote Link to comment Share on other sites More sharing options...
fl327 Posted January 12, 2003 Author Share Posted January 12, 2003 oh yeah, i can see it being of great help if i were running an NA distributor, that allows for more(any) timing adjustment in a turbo application, and it will net ponies im sure, im just wondering if its needed for a 275-300rwhp application with the stock system that only goes about 26 degrees total advance at the most, its so retarded right now it sounds like a houseboat idling underwater! Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted January 12, 2003 Share Posted January 12, 2003 I'd be real interested to know what the ignition curve is for the 300zx ECU as well. Len, I'm not sure what you mean about the system not being flexible in initial advance setting - you can set it to whatever you want...I have mine set to 20 degrees BTDC (stock), but when I'm upping the boost more I will retard it some from there, say 15 degrees. It seems to run fine less advanced, just not as responsive off-boost. It sounds to me like you are running a tooth or two too advanced, as I can adjust my distributor anywhere in the adjustment range (from about 25 BTDC to 10 BTDC) and it idles fine. Quote Link to comment Share on other sites More sharing options...
yo2001 Posted January 12, 2003 Share Posted January 12, 2003 I play around some with intial timing on my car and when I had it retard about 5 deg (15BTDC) I was getting rich statter when the boost starts to come up. But I was dumping at of fuel to make sure that I didn't ping. Quote Link to comment Share on other sites More sharing options...
fl327 Posted January 13, 2003 Author Share Posted January 13, 2003 it does idle fine wherever i set it, but when i advance it even a little bit, when i jump on it its like hitting a rev limiter, unless i clock the distributor all the retarded. Quote Link to comment Share on other sites More sharing options...
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