Input Trigger/Subaru Trigger - VEMS wiki www.vems.hu

InputTrigger/SubaruTrigger (2010-06-15 13:02:58)

Subaru Trigger is about the subaru 6+7 trigger (6 tooth crankwheel and 7 tooth camwheel)

2001 and newer Impreza WRX have a 36-2-2-2 InputTrigger/SubaruThirtySixMinusTwoMinusTwoMinusTwo crank trigger which is also implemented.

Works with the (pictures at the bottom) 6 tooth crankwheel and 7 tooth camwheel.

supported with 1.0.x firmware and in 1.1.x starting with 1.1.72
some old info for 1.0.x are on InputTrigger/ShortGapTrigger
but with 1.1.x firmware the 1.0.x config will NOT work, different config applies (needed: primary_trigger=A3, use the configlet from new VemsTune and verify according to GenBoard/UnderDevelopment/FirmwareChanges )
- it tests good on bench, but DK guys suggest that cranking behaviour is bad. We suspect that sometimes 90degrees < 60 degrees because of the high rate of crank RPM changes during cranking
- with the (primary_trigger bit3=1) advanced filter=enabled and threshold=120%, 60% threshold (half of the configured value) can be configured for fiatstilo-subaru trigger (since around 2010-05-30 1.1.78 experimental)
- since 2010-06-08 (1.1.78 experimental) changed the default (advanced filter=OFF) subaru time threshold from 100% to 66%. (similar as if advanced filter=ON with 133% threshold). This makes it a more reasonable default
- we made a tooth-counting approach that Jorgen recommended that does not care about previous times for decision. Since 2010-06-15 with experimental 1.1.76 it works (even with very quickly varying input RPM)
see MembersPage/MichaelRichards/Projects/SubaruECU
- Seen on North American Legacy Turbo and the 2.5L SOHC plants (definitely on 99-01 plants, maybe on 02-03 plants and possibly earlier)

360 teeth not supported - the rest needs clarification. (separate page?)

Older Subarus(L-Series) with ECU controlled ignition have Crank-position [Signal disc] in distributor.

360 little holes in outer ring presents Crank-angle in one degree/Percent precision (For engine speed signal)
- 360 pulses not supported. Rob made signal disks with less pulses, maybe they can be installed

Four long holes, are crank angle signal. One of the holes is longer, indicating (possibly) Cyl 1. (Working on it!!)

Q: Any ideas how to make it work with genboar v3.0??

A: the 360-3 tooth crankwheel is definitely more than what current firmware can handle

Supported :

Newer subarus (Legacy mark1) have triggers like these:

7 tooth cam wheel:

6 tooth crank wheel: