MembersPage/OddFireSixCyl (2011-04-12 20:53:03)

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)

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, the key to get odd-fire working is

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


Page needs to be cleaned up


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

I would like to keep along with the original cam and crank pulleys since my first step woud be to replace the ignition Marelli ECU which also control the boost, and keep, for a while, the Weber injection ECU (each ecu controls the 2 banks for the previous biturbos)

Hence my concern for coil type trigger ...

I guess the bottleneck is for the firmware to get the angle velocity for appropriate timing

Philippe

On 4/6/11, vems <info@vems.hu> wrote:

> > Hi Philippe,

>> >> I own a genboard V3 and I have simple question that I cannot answer

>> >> despite my reading :

>> >>

>> >> Can vems firmware handle coil type trigger for odd fire 6 cylinders

>> >> engine?

>> >>

>> >> I would be very thankfull if I get an answer :

>> >> - yes + link for an example

>> >> - or no, it does not

>> >>

> > if you mean 90+150 degree type odd-fire V6, than for coil

> > only 30 crankdegree teeth (24 per cam or 12 per crankrot) can be used

> > special uneven reftooth table needed (adding 3 and 5 for 90 and 150

> > respectively).

> >

> > Less than 12 tooth per crankrot not supported. (or only possible with

> > hack like extreme values in per-cylinder ignition trimming).

> >

> > 60-2 or other missing tooth type trigger is recommended (+camsync in any

> > case).

> >

> > If you provide an URL of a thematically organized editable page with the

> > trigger HW of what you have

> > we will try to come up with recommendations or a tested setup for it.

> >