ericsiewkk Posted March 21, 2016 Report Share Posted March 21, 2016 for 4g63 evo1-6 does ignition timing calculation come from cam or crank sensor? or it use both?does ignition timing change if we adjust camshaft by moving cam gear? Quote Link to comment Share on other sites More sharing options...
Simon Posted March 21, 2016 Report Share Posted March 21, 2016 It is mostly from the crank.But requires the cam to sync.You will be able to move the cam trigger with in a reasonable range with out effecting the timing. Quote Link to comment Share on other sites More sharing options...
bsh Posted March 21, 2016 Report Share Posted March 21, 2016 (edited) If it is an Evo 1-3, you can not move the cam timing for the inlet cam without sync timing again, as both "crank" (trig1) and cam (trig2) are mounted in the back of the intake cam. Adjusting exhaust cam dont affect timing.The newer Evo 4 and upwards do have the crank sensor on the crank where it should be, and will not affect timing when moving cam gear Edited March 22, 2016 by bsh Quote Link to comment Share on other sites More sharing options...
ericsiewkk Posted March 23, 2016 Author Report Share Posted March 23, 2016 Simon, how far can we move before it started to affect sync?the reason i ask is because i am using an evo8 cam in evo3, the evo8 cam key slot is out by 45 degree retarded when the cam timing in correct position. i did not make a new slot for cam sensor.trig1 is on the crank so no problem there. Quote Link to comment Share on other sites More sharing options...
Simon Posted March 24, 2016 Report Share Posted March 24, 2016 I'm not sure.The test will be if you get RPM reading without trigger errors.As long as there are no trigger errors you will be able to adjust for any timing shift by doing a timing calibration and adjusting the offset. Quote Link to comment Share on other sites More sharing options...
ericsiewkk Posted April 16, 2016 Author Report Share Posted April 16, 2016 Simon, i crank the engine for the first time today. the timing light does not line up with the locked timing at 0 btdc.i tried to adjust the trigger offset but still could not get it to line up.do you think the cam sensor trigger 2 is too far off?trigger 1 is on the crank itself so no problem there. Quote Link to comment Share on other sites More sharing options...
Scott Posted April 18, 2016 Report Share Posted April 18, 2016 How far did you adjust the offset? It can go from -360 to +360, so covers all the 720 degree range of a 4 stroke engine. Quote Link to comment Share on other sites More sharing options...
ericsiewkk Posted April 18, 2016 Author Report Share Posted April 18, 2016 i tried 0 to 360 degree.what is the correct offset number for a stock evo3? Quote Link to comment Share on other sites More sharing options...
Simon Posted April 18, 2016 Report Share Posted April 18, 2016 For a totally stock set up it should be very close to 0.But if you have moved the CAS then it could be different from this.If typing in an offset make sure you hit enter after typing in the number for it to take effect.Don't forget you can move the offset negative. Quote Link to comment Share on other sites More sharing options...
ericsiewkk Posted April 19, 2016 Author Report Share Posted April 19, 2016 Solved it. The ecu could not accept trigger 2 that much off.I cut a new key way on the cam and time it at stock position. All good now. Quote Link to comment Share on other sites More sharing options...
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