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:
- Erik Englund grinded off 1 tooth earlier, and used it as 4+1 trigger system.
- We are working on firmware implementation (and related config) to support the factory trigger
- we assume that the 270 degree big camwindow (HALL is high or LOW there?) contains 2 primary triger pulses (rising edge of the crank-HALL)
Please measure the positions. It is possible that the big camtooth "overlaps" the crankpulse rising edge, while the short camtooth not. In this case we can make a simple (2-line) filter in the cam-trigger-code to filter out the small tooth. Otherwise it's a bit more complex, but let's see first.
Maybe the multitooth bit in the config.secondary_trigger could be used for this (actually seems like a good place, not currently used).
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/