Members Page/Reinis Andersons/Trigger Log

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07.09.2010

I'm trying to set up camsync on BMW M50 inline-6 engine. The engine starts and revs smooth but it shows trigger errors and tends to foul plug on cyl6. I did some triggerlogs with Vems Tune today. Maybe someone can comment my triggerlogs.

Triggers:

Primary - 60-2, VR

Secondary - 1 tooth, Hall

FW 1.1.81

VT 2010-08-19

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Config - http://www.vems.hu/files/Reinis%20Andersons/v3.3_n002875-2010.09.03-23.33.48.vemscfg

Triggerlog (.csv and .triggerlog)- http://www.vems.hu/files/Reinis%20Andersons/Camsyncm50.zip

Should I try to use secondary trigger "cam-HALL inverter" ?

Secondary trigger most of the time gives 4.5V signal and 0V only on trigger tooth?

The cam-HALL inverter only matters for the 135 (-140-142) tooth auditrigger, when the cam-HALL is used as a mask for the crankhome-VR signal.

For primtrig=60-2 it is not used as a mask, simply the position of the chosen edge matters. So for 60-2, inverting cam-HALL in hardware should be exactly the same as chosing the other edge in software configuration (secondary trigger rising/falling). Unlikely to help.

Maybe advance secondary trigger tooth about 3 crankdegrees?

if clearance is so big (>24 degrees) as on the triggerlog (with sectrig=falling edge), that is unlikely to help either\n

ID  Prim.trig.msec  Delta  Ratio  Sec.trig.msec  Delta   Comment 

290  2201.648(288)   7.784  1.00
291  2209.304(289)   7.656  0.98
292  2216.652(290)   7.348  0.96
293  2223.620(291)   6.968  0.95
294  2242.756(292)  19.136  2.75                       "MISSING TOOTH: 2, cycle=58"
295  2248.740(293)   5.984  0.31
296  2254.828(294)   6.088  1.02
297  2261.068(295)   6.240  1.02
298  2267.704(296)   6.636  1.06
...
...
345  2597.284(343)   7.528  1.08
346  2604.644(344)   7.360  0.98
347  2612.064(345)   7.420  1.01
348  2619.528(346)   7.464  1.01
349  2626.872(347)   7.344  0.98
350                               2633.396(2)  6.524
351  2634.264(348)   0.868  0.12
352  2641.388(349)   7.124  8.21                       "MISSING TOOTH: 7, cycle=58"
353  2662.048(350)  20.660  2.90                       "MISSING TOOTH: 2, cycle=1"
354  2668.928(351)   6.880  0.33
355  2676.172(352)   7.244  1.05
356  2683.532(353)   7.360  1.02
357  2690.228(354)   6.696  0.91

Screenshots from Trigger Analyze:

The above shows >24 crankdeg clearance between falling edge and tooth0. Good !

In this screenshot I changed secondary trigger edge from falling edge to rising edge. Logged it to show Hall polarity and how the secondary trigger tooth is positioned.

This, with rising edge is BAD ! Less than 12 crankdeg clearance from tooth0 (dangerous depending on cambelt sloppiness, no reason to risk it) ! So stick to falling edge ! (and adjust the ign outputs accordingly)