Honda K20X
All this family is supported by VEMS v3 ECU firmware and hardware including VTEC and VVTI control
Note: Hi-side PFET-s come handy, see [v3 ECU product options] when VTEC or VTI control solenoid needs +12V (grounded to engine block).
Trigger specs as follows:
- Trigger settings for, [12+1extrapulse crank 4+extrapulse on cam] 4cyl Honda K20A engine camsync. 1.2.41 fw recommended
- Primary trigger HALL
- Secondary trigger HALL: Exhaust(4+1) needed for cam sync
- please note that clearance is only 2 degrees at some sectrig to primtrig transition (way lower than the 10..15 crankdeg for any normal trigger pattern), so nissan type (higher frequency, not as great noise tolerancy) sectrig input might be needed for this pattern; Luckily the interesting transitions are more than 5 crankdeg apart, so no problem experienced in practice.
- 3d trigger HALL: intake(4pulses), needed for campos for intake cam
- the 4 active coils work with logiclevel output 0/5V with standard 255 Ohm (or even with 510 ohm) series resistors.
Triggerlog picture of test on bench confirming good sync-up and spark:
Configlets for this engine are available in VT -> primary trigger -> "4cyl_12+extra_Honda_K20AX_Camsync"
With the information above the setup and installation should be quite straightforward. Spark positions in above triggerlogs might not match real engine (strobe and adjust to correct triggertooth and tdc_delay, when exact info available please take a note here with exact engine code).
F20C 2005 and up is same trigger wheel as k20X but different sensor type is used:
- Primary trigger VR
- Secondary trigger HALL: Exhaust(4+1) needed for cam sync
Configlets for this engine are available in VT -> primary trigger -> "4cyl_12+extra_Honda_F20C_05_up_Camsync"
All these engines work (known good, triggers benchtested way above practical max RPM, >14000 RPM)
- in 2018, syncup mods were requested, separate implementation for cam_check_pol
- originally high-rev benchtested with busyloop stim benchmark.c L336 (primtrig was wired from inverted fetdriver output, not injector output ?)
- similar: /svn/firmware/utilities/testing/rigol to write rigol DG1032Z signalgen compatible csv file
- see InputTrigger/HondaFTwentyTrigger for F20c 2000 to 2005, which is different trigger (12 tooth on crank no extra/missing + 3 cam pulse required for sync all VR crank / cam)