MembersPage/CatalinS (2013-09-12 09:40:52)

The engine is a bmw s50b32 converted to single vanos on intake with a trigger with one tooth installed at ~60 degree before missing tooth, the vems trigger log also shows this.

The ecu is unit 7148, vr vr and 4 pfet for vanos control

The car runs perfect in wasted spark mode. Is making 806hp at 7700rpm and 1.5bar boost. Now I'm trying to make vanos work on intake so I can make boost faster, now I see 1bar at 5000rpm.

Vanos is working good from the logs I made but I have problems with the secondary trigger.

When cranking the signal is very good and stable, the problem is when I start the engine. I have to many sectrig and I can't rev past 1300 (similar is the symptom when VR is reversed), the ecu seams to reset as the afterstart flag comes on.

I tried to play with the filter settings (minimum angle 39, maximum 120) and i manage to filter it a little and now i receive only sectrig pos bad and the engine revs, as you can se in the logs at ~4000+rev the trigger error is gone!!!

I made the following:

- Changed the sectrig wiring, completely separate from the engine wiring, from the sensor strait to the ecu, Same result

- Changed the polarity of the sectrig. the signal moved to the second tooth after the missing tooth and the logs shows ~350 degrees. This was wrong because the trigger was installed at ~60 ( 9 tooth before missing tooth )... anyway with the polarity change same sectrig errors

Don't set VR polarity according to position. Just set the right GenBoard/Manual/VrSensor/Polarity

- I changed the vems ecu with a similar one ( vr vr ). same result

- I tried and pull the sensor out ~1mm and got less errors and manage to rev the engine to ~2500rpm with no filters , if i try to pull the sensor more than 1mm the sectrig signal is gone.

- I started with firmware 1.1.96, with this firmware the car worked for a few years with the old ecu without the pfets. Now i have firmware 1.2.11

I will try to look again at the wiring, grounds and maybe rewire the crank and cam triggers!!!

Please let me know if you have any ideas

trigger logs: http://www.vems.hu/files/Catalin_S50/


I manage to install another vr sensor ( crank sensor from a Maserati Quattroporte) it has 900ohm and seems that it works good. Only a sectrig bad flag right when the engine starts and when I rev from idle. This is with no filters.

Original sensor scopeshot:

original%201300ohm.jpg

Maserati sensor scopeshot:

maserati%20sensor%20900ohm.jpg

Positive pulse should be followed by negative pulse (triggering happens at the zero-crossing negative-going edge), so these show Reverse polarity. Also, the amplitude of oscillations (child teeth ?) after the pulse are insane !

Is the large pulse appr 10 teeth after the primtrig missing tooth ? (if yes, than secignore=16, that is ignore sectrig after tooth22 could be useful)...

So the basic question remains: