Mitsubishi 6G72 page
Installing VEMS into a Mitsubishi Galant 2.5 V6 turbo, engine code 6G72 (Cyclone V6 engine firing order: ...)
Timing info on MembersPage/PeterJensenMitsubishi
Apparently supported by any nonancient fw (use >=1.2.31 for other reasons) with proper config.
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. MembersPage/Fero/MitsubishiEVO
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
- threshold is 80 deg for 4 cyl (where period is 180 crankdeg)
- threshold is 53 deg for 6cyl (where period is 120 crankdeg). Is that good or not for this 6 cyl trigger ?
- on this V6 : 45 degrees in 3 occasions (=> exact same condition not good for V6).
- however, sectrig falling to primtrig falling < 53 deg is true for one event (25 deg from 100 to 75 ; please confirm !) => so no firmware mod needed apparently, just configure "EVO" and than change to 6cyl and primtrig falling
Note: Marcell didn't notice that primtrig falling needed in this case, and implemented a CYCLONEV6 fw mod (in effect when "EVO" with >4 cyl configured; 1.2.36 version, but not published): at primtrig (falling), NO sectrig (falling) pulse seen since last primtrig
- but looking at the pulsetrain again, it seems now that happens twice (than NOT good)
Proceed path: get scopeshot(s) or angular positions numerically (or verify Peter's)
- 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 resistors (because most USB soundcards have only 1 channel input; only output is stereo).
- timing is everything here: precise info needed to make a good "signalgen" wav for audacity benchtesting (results are not valid if sectrig relative pos is different than real)