golf-2 Posted December 23, 2018 Report Share Posted December 23, 2018 hello about the bmw m50 nv crank and cam trigger scope is this right or polarity reversed?? thanx Quote Link to comment Share on other sites More sharing options...
Adamw Posted December 23, 2018 Report Share Posted December 23, 2018 Both crank and cam are incorrect polarity in that capture. Also with the cam tooth being right in the middle of the crank gap could potentially be a problem. Set the trig 2 like below usually works best in this case (set as hall instead of reluctor): Quote Link to comment Share on other sites More sharing options...
golf-2 Posted December 23, 2018 Author Report Share Posted December 23, 2018 making the cam setup hall although the sensor is vr? Quote Link to comment Share on other sites More sharing options...
Adamw Posted December 23, 2018 Report Share Posted December 23, 2018 Yes, since we are not worried about the timing accuracy of the cam pulse, changing it to hall allows us to choose rising edge which is safely to the left of the crank missing teeth area. Quote Link to comment Share on other sites More sharing options...
golf-2 Posted January 12, 2019 Author Report Share Posted January 12, 2019 question plz thae cam signal is for reference of the stroke only??, didn't effect the ignition timing?? Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 13, 2019 Report Share Posted January 13, 2019 Correct, with a missing tooth crank wheel the cam is only used for phase detection. So really the most important aspect is the cam edge that you are using must always occur on the same side of the crank gap. Quote Link to comment Share on other sites More sharing options...
golf-2 Posted January 16, 2019 Author Report Share Posted January 16, 2019 this capture after making cam hall rising. this signal right?? Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 16, 2019 Report Share Posted January 16, 2019 Photo is too blurry to see the cam signal well, you would be better to use the save as log feature. One thing I can see though is your crank sensor is wired incorrect polarity. Quote Link to comment Share on other sites More sharing options...
golf-2 Posted January 20, 2019 Author Report Share Posted January 20, 2019 Hello, this what i get when reverse the crank signal, is that right?? Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 20, 2019 Report Share Posted January 20, 2019 Crank is now correct, cam is still wrong. Quote Link to comment Share on other sites More sharing options...
golf-2 Posted January 25, 2019 Author Report Share Posted January 25, 2019 hello, this is the last thing a made it , cam is hall , rising, car running normally till rev limit, is that right?? although crank look weird thanx Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 25, 2019 Report Share Posted January 25, 2019 Cam sensor is wrong polarity by the looks. Can you swap the wires and do it again. Offset will probably need to change by 360deg when you swap it. Quote Link to comment Share on other sites More sharing options...
golf-2 Posted January 30, 2019 Author Report Share Posted January 30, 2019 Hello, this is the last thing i do, hope this is correct, but why crank signal not smooth like privious capture?? thanx Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 30, 2019 Report Share Posted January 30, 2019 Wiring is good now. Now you need to set trig 2 to hall & rising edge. Quote Link to comment Share on other sites More sharing options...
golf-2 Posted January 30, 2019 Author Report Share Posted January 30, 2019 ok thanx i will do it hall, but question what is the effect running as this?? as car running normal thanx Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 30, 2019 Report Share Posted January 30, 2019 The zero crossing of trigger 2 is very close to the index tooth on trigger 1 (the first edge after the gap). It may work ok for a short time like this, but any small movement between cam and crank - say due to belt stretch or thermal expansion could cause a trigger error. Changing trig 2 to hall & rising means you are then triggering of an edge that is further away from the gap so it will have much more tolerance to cam movement before a trigger error can occur. Quote Link to comment Share on other sites More sharing options...
golf-2 Posted January 30, 2019 Author Report Share Posted January 30, 2019 Hello, i change the cam to hall, rising, resistor off, the engine didn't start at all, return to vr , it start but it didn't run smooth as the polarity was reversed Any idea?? thanx Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 31, 2019 Report Share Posted January 31, 2019 Did you change the offset by 360deg? On 1/26/2019 at 9:53 AM, Adamw said: Offset will probably need to change by 360deg when you swap it. Quote Link to comment Share on other sites More sharing options...
golf-2 Posted January 31, 2019 Author Report Share Posted January 31, 2019 sorry , what do u mean by change the offset?? trigger offset?? iam using 276 as many m50 non vanos Quote Link to comment Share on other sites More sharing options...
Adamw Posted January 31, 2019 Report Share Posted January 31, 2019 Yes. If it was originally 276 then to change the offset by 360 you need to set it to -84. You also need to test this with a timing light, dont just use a number because someone else with the same engine used it. Quote Link to comment Share on other sites More sharing options...
golf-2 Posted February 2, 2019 Author Report Share Posted February 2, 2019 Hello, the last thing i did , -84 offset , cam hall, rising, is that the right thing?? the signal of the cam is near from the crank gap thanx Quote Link to comment Share on other sites More sharing options...
Adamw Posted February 2, 2019 Report Share Posted February 2, 2019 Yep this looks good now. Quote Link to comment Share on other sites More sharing options...
golf-2 Posted February 2, 2019 Author Report Share Posted February 2, 2019 Ok thanx for support last 2 question is this near cam signal from crank gap can make problem in high rev?? is the arming table is perfect?? Quote Link to comment Share on other sites More sharing options...
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