Odd fire 90,150,90,150,90,150 degree V6
Needs to be cleaned up
- also we'll make index page to different odd fire engines (and some generic instructions).
- Generic information will come to this page, and specific to the Maserati biturbo goes to MembersPage/FPhil (started with very similar content)
The key to get odd-fire working is
- the reftooth table.
- obviously the secondary trigger must be enabled as camsync
- also, enabling the odd-fire bit might be needed so the RPM does not fluctuate up/down according to 90/150 degree time, but measures every second event (240 degrees)
- maybe some cheating with the cyl number also needed to show correct RPM (the cyl number has no other effect currently)
Trigger setup
I made a .wav file for testing : Find IgnitBiturbo1000.wav at url
I have updated my wiki with this information
The solution to set 30 crankdegree teeth on the crank pulley was also
the solution just given to me by Matthias from Vems uk:
http://www.vemssupport.com/forum/index.php/topic,1648.0.html
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 or to get it from the Marelli board.
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.
> >