Sequential Coil-on-plug Crank/Cam Pickups

[NissanBoy]

I have read carefully all the MSNSe ( http://megasquirt.sourceforge.net/extra ... wheel.html ) and i am still confused about how can Ms figure out a proper ignition timing with a 4/1 wheel using 2 sensor

Im really into the nissan scene where CKP/CMP sensors are optical unit running on 360/4 holes disk , since i want to run coil on plugs i know i have to add extra hardware on the ms and load the proper code form msnse

Basicly i would like to know if MS would decode my stock ckp/cmp or if i would have to make a wheel like this :

but i can't figure out how can MS can give an exact timing if there is only 4 slots on a disk. It anticipates when -10deg(or whatever timing it's supose to give a Xrpm and X load) is gonna come and just triggers the spark ?


Excuse my ignorance but i am kinda noob in this domain, i searched the whole ignition forum and haven't found much detailed how to on sequential COP so i am asking the question here

of course im talking of a MS1 with V3.0 board running msnse

[jsmcortina]

The code isn't designed to support the OEM 360 tooth wheel, so something like that picture is required. Yes the CPU calculates when to spark and it works.

James

[NissanBoy]

How can it work ? do you know or could you explain please , not that i absolutely want to know why but it's for personnal knowledge

i studied in mecanics and we worked alot with ignition and injection and i wonder how can such a system work

Anyway , glad to know that i'll be able to get the result i was hoping for , thnx for the quick answer

[jsmcortina]

Short answer: a computer, timers and some maths.

JAmes

[randy77zt]

the odd slot closer to the center of the wheel is where the ecm gets #1 cyl identification.the outer 4 slots are for each cylinder.the optical sensor actually has 2 led's inside.my ms fires with a hall sensor and magnets in the flywheel.