Mitsubishi EVO VI-VIII
- 4 cyl, 2.0 4G63 engine
- Vems V3.3
- wastedspark active coil
- turbocharged
- stepper IAC valve
- 4 bar MAP sensor
- HALL crank sensor
- HALL cam sensor
My plan is to use the stock trigger system. It is important because the race rules don't allow to modify it and mitsubishi EVO-s are more than 90 percent of the racecars here. It's a very big market.
Here is the stock crank triggerwheel. It has two simple big 67 deg tooth, The rising edge of the tooth is about 67-70 deg before TDC:
And here is the problematic cam trigger: a bigger and a smaller tooth, I don't know the exact TDC position yet => The position would be VERY important. A scopeshot (both triggers) would help a lot:
- Scope shot:
- Erik Englund grinded off 1 tooth earlier, and used it as 4+1 trigger system.
- V3 fw1.1.91 has firmware support with "Mitsubishi Evo 6-7-8" configlet
- The triggering method is to check the delay degree from Secondary trigger falling edge to Primary trigger rising edge
- the measured degree must be in the configured range
- in Basic setup menu/ Secondari trigger settings / Minimum valid sectrig->primtrig angle for EVO & Maximum valid sectrig->primtrig angle for EVO
- Default value is min: 0 max: 90, so the ~47 degree measured will accepted, as can seen the picture below
- the measured degree must be in the configured range
MembersPage/PhatBob - Rob Van Asbroeck has this engine running on simple trigger with one of the cam teeth removed.
Triggerlog from evo3, one with rising, one with falling edge for cam sensor: http://media.vems.se/mitsu/
.- I will try to dedicate some time for measuring the triggers with oscilloscope on a stock Evo-3 this upcoming weekend. / Erik Englund