Mitsubishi 6G72 page
I'm about to install VEMS into a Mitsubishi Galant 2.5 V6 turbo, engine code 6G72
Trigger pattern is a bit unusual. Trigger wheel is like this:
It's very similar to the Lancer EVO trigger, but 6 cyls instead of 4.
http://www.vems.hu/wiki/index.php?page=MembersPage%2FFero%2FMitsubishiEVO
Apparently Peter Jensen had experience with this engine back in 2010, but now I cannot open his old triggerlogs, or interpret those configs with currently accesible VemsTune versions:
http://www.vems.hu/files/MembersPage/PeterJensen/mitsu/
Some hints to prepare?
Scope and/or Bench-test with the following in mind:
- start from VT primtrig dialog bottom, EVO configlet, key (verify after setting) is
- primtrig normal coil with sectrig subaruspecial = EVO 6-7-8
- bit6 of: config_secondary_trigger & _BV(strig_subaruspecial)
- sync condition: sectrig (falling) to primtrig (rising) time < 80/180 * period
- which is 80 deg for 4 cyl (where period is 180 crankdeg)
- 53 deg for 6cyl (where period is 120 crankdeg). Is that good or not for this 6 cyl trigger ? (if not, it's fairly easy to change or make it configurable)
Proceed path: get scopeshot(s) or angular positions numerically
- can be captured with VEMS configured to simple coiltype trigger + strobe if you know what you're doing
- but better scope, or get a free USB soundcard from Marcell and fry that (NOT your notebook's mic input :-). Mix the primtrig and sectrig with DIFFERENT amplitudes (because most USB soundcards have only 1 channel input; only output is stereo).
- timing is everything here: without precise info we cannot even make a good "signalgen" wav for audacity benchtesting (results are not valid if sectrig relative pos is different than real)