Most of the work is done in software. You will probably want to drive = the 4 injectors with MOSFETs (low side switched). The MOSFETs should = probably be rated for 200v and you should have a TVS diode reverse = biased from drain to source rated about 60v. The ignition coils are similar but I believe IGBTs are more commonly = used here. The IGBTs should probably be rated for up to several hundred = volts. You may desire to put TVS/zener diodes across the gate to source = as well. Use a high current gate buffer for either IGBTs or MOSFETs - at = least an amp max. Power supply filtering is VERY important in an = automotive application. It should continue to work for short periods = down to 8 volts, and up to 45 volts. I wish you luck with your project. If I can be of more help let me know. = It can give you anxiety to build something to control an engine! -- Martin Klingensmith Sven-=C5ke Larsson wrote: >Hi List! > = >I would like to build a PIC controlled ignitition to replace the old crapp= y stuff in a veteran VW bus. There are a bunch of existing products but I w= ant to make it myself for the fun part (of course). I did some Googling but= couldn't really find any good info, can anyone point me in a direction or = can give some ideas? > = >What I really would like to do is a complete ignition and injection contro= ller to get rid of the carburator as well. It would be really great to be a= ble tune both the ignition and the injection curve. :) > = >Regards, >Sven > = > -- = http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist