VEMS Community Forum

Technical => Ignition => Topic started by: Kartis on February 27, 2010, 06:53:27 am

Title: 24 sparkplugs, what should i do?
Post by: Kartis on February 27, 2010, 06:53:27 am

Got a mercedes v12 with twin plugs.
Tried to get this to work with four 2x3 Bosch coilpacks (Webshop) and four ignition controle modules (0 227 100 203)
So 1 igbt output controlls 2 modules, 500ohm pullup to +12v, Invert driver output enabled.
During cranking i get very long dwell, 2sec and this this blows the fuse, or the ignition module ::)
Looking for alternative options. Can i put dual igbt´s in a external box and drive these with logic outputs?
Since this engine requires six outputs in wasted spark i can´t use stepper.

Title: Re: 24 sparkplugs, what should i do?
Post by: MWfire on February 27, 2010, 01:27:46 pm

you can't drive 2 coil with one igbt. One coil=1 igbt. But you can drive more than one igbt with one vems chanell. But you need to add resistors for all external igbt and short resistor in vems box.

Title: Re: 24 sparkplugs, what should i do?
Post by: Kartis on February 27, 2010, 02:39:39 pm

Yes that was my thought, how should i size the resistors? If i remember correctly i got 510ohm in the ecu now,

Title: Re: 24 sparkplugs, what should i do?
Post by: MWfire on February 28, 2010, 09:16:23 pm

510 should be ok.