3.5 years ago (!) when I first bought the VEMS 3.3, I had some project for my Volvo 850.
Since then I had a Maserati biturbo and so I was more involved during my spare time with mechanics than with electronics or software. Hopefully the car is 200km from where I live !
This page is now overloaded, so let's start to split thematically
- MembersPage/FPhil/FirstBenchTesting
- MembersPage/FPhil/AFRMeasurement
- MembersPage/FPhil/TriggerHardwareSetup (adding 2nd VR)
- continue splitting
VR - VR Trigger
This biturbo has an odd fire engine
- with bizarre triggers
- do you have more details on the trigger ?
- pulse positions: R(26-08-08) see the ESjaavik's Maserati page (link?).
so that the distributorless biturbos produced at the end were more easily equiped by Maserati with 2 ECUS, each one dealing 2with an 1/2 engine which is then 3 cylinders even fire.
Recently I aimed to use Vems to measure C0% at idle in order to fine tune the A/F potentiometer set on the Weber injection ECU.
Wiring
Document wiring here !!!
email conversation suggests serious miswiring (like fused grounds)
You should start from 0, documenting the whole setup
- every wire you connected.
- every measurement
02/04/2011
Indeed it is a slow project. My Maserati biturbo my 1987 is now working fine and I am actually looking inside the eprom of ignition ECU (Marelli Microplex 602F).
From time to time I play with the Vems Ecu on a bench which is easy now thanks to Vemstune.
The engine car is 6 cylinders odd fire, sequence for ignition is 150°-90°-150°-90°-150-90°.
Triggers are 6 pins (30°-90°-30°-90°-30°-90°) on crank pulley, 2 pins on cam pulley 25° apart.
I made a .wav file for testing
Does anyone know if Vems firmware is able to track this profile?
April 12 2011
This is great, Marcell has opened a new odd fire 6 cylinders page !! ;)
http://www.vems.hu/wiki/index.php?page=MembersPage%2FOddFireSixCyl"
There is a view for the ignition system of the biturbo there
http://www.eurospares.co.uk/partTable.asp?M=3&Mo=478&A=1&B=27127&S=
where you can see 2 of the 6 trigger poles which are set on the crank pulley.
The cam pulley can be seen here,
http://www.eurospares.co.uk/partTable.asp?M=3&Mo=478&A=1&B=27110&S=
however the 2 trigger poles are hidden.
April 28 2011
Info & To Do First
Some information about the ignition and injection system from Enrico's site
http://www.maserati-alfieri.co.uk/alfieri155-8-electrical-system.htm
As you can see the Ignitio interface is quite simple:
inputs : crank and cam triggers,pressure kpa, knock
outputs : driver to coilA, driver to coil B, solenoid boost valve
What do I aim first?
- Fit Form and Function : Make the Vems to substitute the Marelli Microplex ECU ignition with same ignition mam : .
- Be capable with appropriate tools to verify this FFF specs.