MembersPage/Gachax/SolvedIssues (2012-04-29 17:09:59)
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1) Date: 23.04.2012. Trigger log looks perfect, but completely at random some spark events just doesn't happen. Sometimes spark is missed even at idle speed, but it gets a lot worse above idle.

Here's a screenshot from trigger log at about 2500rpm. Maybe someone could help.

trigger_log_missing_spark_events.PNG


First, you need to upload a triggerlog and .vemslog so that we can walk through all your settings to find something faulty.

Do you use the same config as the pictures you have in MembersPage/Gachax/Software ?

You have to change your Angular width of tooth to 30 .

Change your ignitions outputs in use to 6. Ignition outputs (from top to bottom):

0 2 1 0 2 1

Ref Table(From top to bottom as it shows):

0 8 4 0 8 4

Try this and it will probably work alot better.

// Erikk


Wow, newer thought someone would actually reply! Thank you!

here is the triggerlog http://www.vems.hu/files/Gachax/v3.3_u004705-2012-04-22-15.49.41.triggerlog. I don't have usable vemslog as I was fighting with IAC all the time when recording those logs. I found this issue with spark events and continued on logging trigger not a whole log. Anyway they seem to be not directly related in time, I mean if I record trigger log I cannot record vemslog at the same time.

And yes, the configuration is the same as in MembersPage/Gachax/Software. I uploaded current config file as well http://www.vems.hu/files/Gachax/config2_2.0.vemscfg.

I tried to change Angular width of tooth to 30, but then engine wasn't working at all. In any case, if I understand it correctly, 15 degrees is the actual width of a tooth of my trigger wheel (description in MembersPage/Gachax/Hardware), although I don't know how VEMS is using this number in calculations.

I was actually thinking of using all 6 ignition outputs (hoping it'll do something to spark events as I'm stuck with this and don't know what else could be changed), but how can I do that if I have 3 coils. Can I just solder 2 outputs together in one? Wouldn't that burn something? Other way would be to enable Dual Output Mode, but then there will be twice the power to coil (although I'm not electrician to know these things) and both outputs will have to be soldered together for the same reason of 3 wasted spark coils.

-Gatis


You´re welcome.

Try this config and reply with results: http://vems.hu/files/Gachax/config2_erikk.vemscfg


Now I understand what you meant by using 6 ignition channels :). It somehow didn't occur to me that I can use the same ignition output twice in output settings. Thanks again, I'll report back this weekend.

-Gatis


Date 29.04.2012

Solved!!! It works with a new config. I played with settings and realized that those 15 degrees was the real cause.

As I mentioned engine didn't sound as good with 30 degree setting, but no spark events are missing. So I changed the TDC After the trigger settings and got it working.