I am looking to add programmable ignition curves with mapping to inlet manifold pressures on air cooled twin cylinder and single cylinder 4 stroke motorcycles. The Twins are single spark plugs per cylinder and the singles have dual plugs. All the motorcycles have positive earth wiring and components to suit, changing to negative earth is not difficult but I would like to keep them positive earth as after 30 years of looking after them its imprinted on my brain . Timing signals would be run off the camshafts running at 1/2 engine revs, 1 sensor for the singles and 2 sensors on the twins with a preference for modern coils mounted on the spark plugs for hot spark when kicking over. Carbs are old style and not likely to be ever upgraded to injection. I do not want wasted spark especially on the singles as on these both plugs need full spark when firing but I may go twin spark on one twin but would use 2 dual coils each firing one plug in each cylinder.
Looking through the boxes you offer there look to be 2 solutions that would work but need help to decide which is the better option for me.
1. A SECU-3T with MAP plus 2 BIP373's mounted on a PCB for multi channel coil drivers for neatness. Option to add bluetooth is noted. As the case is plastic and not earthed this should be installable within positive earth and relatively vibration proof. No short circuit or over temp protection.
2. A SECU 3L, this includes MAP and 2 coil drivers internally. Bluetooth does not seem to be an available option, the case is metal and is earthed so the box would need to be isolated from any metal component if it was to be installed into positive earth with the danger vibration could affect this isolation in the future. Does have over current, over voltage and over temperature protection.
Could you confirm my analysis is correct and is there anything else I need to consider. I am currently favouring the SECU-3T with the Bluetooth and plastic case.