See
- MembersPage/RijaRobinson/SFiftyBthirtyTwo S50B32
- MembersPage/RijaRobinson/SFiftyBthirtyTwoVanos (Vanos subpage)
- WideBand/Connector (dual WBO2 and LSU4.2 / LSU4.9 notes)
- MembersPage/RijaRobinson/AuxiliaryConnector (EC10)
S62B50 M5V8 '
My new project is a S62B50 M5V8 with Vortech V7 supercharger
VEMS V3.6 VR Hall Hall
I want to control only intake cams as there is not enough drivers for the 8 solenoids.
- there are enough digital outputs internally, so if ordering VEMS ECU with comment "+4 NFETs"
- (or even +6 or more is possible), the drivers are added inside (extrafets, s259 and p259 channels, 2nd wbo2 heater, ... max 2+8+8+1=19 strong outputs at extreme, beyond the 8 injectors and 8 ignition outputs, not counting some external v3 => AIM => round PWM outputs).
IGNITION SYSTEM:
WASTED SPARK: 2X bosch ignition coils from vems shop
Second trigger is originally on exhaust cam but as i will leave exhaust cams static I moved one exhaust trigger to one of the intake cams.
So one intake cam has the second trigger bolt on it and the other cam has the third trigger.
The idea is to control one intake cam with intake target table
and the other intake cam with exhaust target table.
The exhaust cams are not monitored but the solenoids will be activated with a relay to force them reach max advance position all the time.
This is a trigger log when the car refused to start:
http://vems.hu/vemstune/sharingcenter/reports.php?cmd=view&key=EoZV6p#comments
Now the engine starts well but there are some trigger errors.
- yes, for this special "wasted spark, but still camshaft angle control" setup trigger-error can be neglected if the trigger signal otherwise looks good (on triggerlog, scope, ...) and the RPM reading is stable and engine runs well.
And the intake cam positions are different from one bank to the other.
- for big difference (>10 deg) adjust "measure tooth" so that measurement is in: 20-90 degree range
- for small difference, it's just reality reflecting in the measurement (measured from selected "measure tooth": the target table can be used to compensate accordingly)
If the cam control is not reliable I plan to drive them with a double contact relay to advance the cams on mid range revs and retard them at idle and high revs. (Like On OFF)
That's a big compromise. 2 cams should be controlled perfectly: precisely with good transient response. Don't settle without that. Follow Dave's advice (and maybe reread [camshaft-angle control related VT help] )
The most common problems related to camshaft-angle control (assuming trigger is set up, "measure tooth" selected, and sectrig position / third trig position measurement shows reasonable values):
- output controlling the other camshaft (not the one related to the sectrig/third trig signal that is measured). Sectrig is often the exhaust cam (reason: when intake cam has even pattern it's not suitable for sectrig, only as third trigger).
- BMW: 2 solenoids that belong to same camshaft are swapped (or output inverted: also possible for PWM)
For closed loop cam control, start by disconnecting the solenoid plugs and first manually apply 12v to the solenoids (intermittent short pulse) to check if you see the measured position moving. If all is confirmed for both axis (both advance and retard solenoids), use a much narrower Near PWM range 5-8 degree should be good for to start out with.
TRIGGER LOG
there are still trigger error but the car starts well
http://vems.hu/vemstune/sharingcenter/reports.php?cmd=view&key=dYu4lC
S85B50
My new project is a s85b50 engine from e60 M5.
ECU is V3 with internal CAN
Engine has can bus controlled throttles
First issue: Primary trigger is VR is not detected (not seen in triggerlog and RPM=0).
Ground point is bolt on the chassis. Strongly tightened.
The 4 cam signals are all ok.
Info provided by email:
- Everything is working except Primary trigger VR signal.
- maybe ECU is configured as primtrig HALL for some reason ? can you measure input DC voltage with 1k resistor between ground and EC36/27 ? >0.5V (1.35V typically for 2k7 internal pullup) likely HALL input. Measuring <270 mV means weak internal pullup (likely VR), perhaps p259 damaged causing VR not sensed ?
- I have a spare Ecu to test the same trigger on the same harness and it sees the primary signal.
- All the 2nd 3rd 4th and 5th signals are seen on the triggerlog but the 1st.
- Double-check grounds just in case, and see [repair/upgrade]
- I have an engine simulator also to test and the same thing happens.
- The spare ecu is OK.
DB review and feedback
- If the ecu was ordered with pri = VR and 4x HALL (for cam triggers) than it should just work out of the box
- Your other testing (with the other ecu and engine simulator) suggests its not a problem with wiring or sensor, this must be some ecu mis-configuration.