MembersPage/OddFireSixCyl (2011-04-18 20:34:25)

Odd fire 90,150,90,150,90,150 degree V6

Common denominator is 30 deg, which suggests 12 teeth on crank (also called 24+1 pattern with Tools/Play-trigger type c024)

Using per cylinder spark delay: Base setup/Cyl separated spark delay: see bench tested configs for

We continue to find other solutions and support more triggers (including Maserati).

Reftooth-based solution would be cleaner. WARNING: not yet passed testing

With the missing-tooth primary trigger even the multiple-tooth camsync is no problem for recent firmwares using proper "sectrig ignore" value as on MembersPage/DamirMuha/MagnetMmarelliCamSensor

As you see, that method is about

However, different trigger pattern than listed above requires other tricks (or perhaps firmware mod).


Page needs to be cleaned up


Maserati factory trigger setup

[Maserati biturbo .wav] made by Phil.

The solution to set 30 crankdegree teeth on the crank pulley was also recommended by Matthias on [Vems uk]

This is the reply I have posted

"The sensors are VR but it is not a big problem to make a Hall signal from them"

I can filter out one of the crank trigger or even I can divide the triggers by two to make 2 x (1cam trig +3 crank trig) each for one even fire 3 cylinders, for respectively the left bank and the right bank of the engine . But in this last case I need 2 GenBoards !!!

This is what Maserati has done for the late biturbos: 2 triggers + one ecu (ignition+injection) for each bank

The 30,90,30,90,30,90, 30,90,30,90,30,90 arranged according to ign events, trigger tooth marked bold:

The good news is that if firmware userspace "triggertooth" calculation can be tought about the uneven tooth-times (modifying the userspace easier than the interrupt timing code state machine), that might provide a simple 1.1.x solution.