In SX Microcontrollers, SX/B Compiler and SX-Key Tool, bennettdan wrote:

John,
    All you need to do for the extra Injectors is use an Optoisolator connected to the SX pin you have the Injector mosfet on and then out of the Optoisolator to 4,6 or 8 mosfets for a batch injection or use two Optoisolators one on each of two SX pins so you can have bank to bank injection or use an an OptoIsolator for each Injector mosfet per cylinder not many people will need more than 8 cylinders but others could be added and then we can create a daughter card if the need be. But we need the optos to protect the SX from spikes and the mosfets need reverse diodes also. 

GAF, 
    The new cars that have sequencial use it to make better fuel economy not so much for HP right? I have been seeing alot of high HP motors latly that use say 16 injectors on an 8 cylinder so that it will provide the Idle quality with the smaller ones running sequencial and when the boost kicks in they run both sets at bank to bank then batch for full out racing. 

Guys,
   Remember their are so many options when making your own system so why dont we settle on a PCB layout that has the ability to run all options that we can think of then only code in what you need for your application and we might get a group buy on the PCB boards.

On my truck I want to be able to add a turbo some day so I would like to be able to run extra injectors so we need a connector to run a addon daughter board, also sense a wideband O2 may be used it needs a A/D converter instead of just a comparator circuit. I would also like for it to control a TCU transmission controller for different makes of auto so another connector is needed for it. 

So how about we make suggestions and I add it to this Post and then when we all agree we see how much we can have them made for?

We have 48 pins to play with here.
1) Ability to run 8 sequencial injectors and then two extra outputs of ban to bank add on injectors. 48 - 10 = 38 pins left
2) MAP (manifold absolute sensor) 38-1=37 pins left
3) O2 sensor 37-1= 36 pins left
4) IAT (Idle air temp sensor) 36-1=35 
5) Fuel Pump Relay out 35-1=34
6) RPM input 34-1=33
7) IAC ( Idle air control motor/valve) 33-1=32
8) CTS ( coolant temp sensor) 32-1=31
9) Ignition outputs from single coil to muti coil 8 outputs 31-8=23
10)TPS (throttle position sensor) 23-1=22
11)

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