Hi!
My name is Sam Johnson. I live in Victoria BC, Canada.
My project is an Onroad/Offroad Jeep. I am installing a GM 4.3L V6 engine
- sequential EFI (Bosch 0.280.155.968 injectors)
- wasted spark ignition (Bosch 3x2 coil)
- a single Masterpower MPR R6164-12 turbo, 60mm external wastegate (with 4 way boost control solenoid)
- Air to Water aftercooler.
Trigger
- 60-2 crank
- Primary trigger is a Gen4 58x GM sensor (grey in color.) It is a 3-wire sensor with a 5V supply, ground ref and signal output. The hardware is packaged in a round body housing a magnetic sensor and solid state electronics. The electronics convert the AC signal to logic level 0-5v square wave signal. It outputs a (supposedly) very clean waveform. What do I need to do for the vems to correctly interpret this signal?
- Here is pic of the crank reluctor (linked from EFI Connection web site.)
- 4x cam sensor (?)
- can you detail this ? Is that a VVTI V6 with 4 cams (2 intake + 2 exhaust sensors ) ?
- or 1 camsensor with 4 pulse-pattern ? How are the pulses timed (they should not be evenly spaced, at least that does not make sense for camsync/secondary trigger)
- secignore can be used to neglect eg. tooth > 13 (just an example), but of course sectrig pulse should only come every 2nd crankrot (tooth 0-12 in the example)
There is a single cam sensor with an unevenly spaced 4 pulse-pattern. Here is a picture of the cam reluctor:
I am making an effort to find a waveform depicting the cam pulses referenced to crank position.
Just capture triggerlog with
- sectrig=falling
- and sectrig=rising
Hoping to use VEMS genboard to control the engine with wideband EGO feedback and pre-turbo EGT thermocouple for tuning. I intend to get anti-lag working with my 3 speed automatic transmission (obviously anti-lag NOT required for shifts, only for closed-throttle deceleration and launch.)
Ion Sensing?
Is this tech dead? I notice both vems and B&G were developing Ion Sensing boards back in the early 2000's but things seem to have gone quiet since then. What's happening?
Is there an opportunity to help with development?
Also hoping to use genboard on-board MAP sensor for dynamic BARO correction with an engine-mounted Bosch TMAP (2.5 Bar) as the primary MAP sensor.
- baro correction can use external sensor (115 kPa, or same range as internal MAP sensor are most common to use, but... )
Do you mean to say " baro correction can use INTERNAL sensor " ?
- yes, you can request in the order comment "an internally mounted baro pressure sensor connected to mcp3208" (dynamic compensation during running - dynamic baro compensation is required for mountain rally or airplane)
- or even internal or external MAP sensor can be used for baro compensation if it's sufficient to sample barometric pressure at boot-time
- a common method for engines rarely driven at a much higher altitude than it was tuned... -20% pressure that requires appr +8.2% fuel can be handled easily by tuning +8% rich and leaning with wideband-lambda-ego.
Also of possible interest to the community is my effort to model the engine in Ricardo WAVE. I have a working model now but am still calibrating with dyno logs from similar engines. Once calibration is complete, I hope to link the model to a SIMULINK model of the VEMS. Has anyone modelled the VEMS firmware in SIMULINK?
- Probably not