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PostPosted: Fri Apr 30, 2021 3:28 am 
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Hi Ed,

I would think any misfires or mistriggers of the crank sensor during running would cause the ECU to lose phase. It would seem the ECU would best read the cam sensor regularly, if not every crank cycle. It's not critical for running, but then the sequential injectors would not be in the desired phase with the engine cycle if there were mistriggers.

Lou

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PostPosted: Fri Apr 30, 2021 6:54 am 
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Location: Lawrenceville, GA
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emsvitil wrote:
I may be wrong, but don't most ECU ignore the cam position sensor once they've already figured it once during start.......

So if the signal is good enough during starting for the ECU to figure out where the engine is in it's cycle, you're good to go.


The MS3 is set so that in missing tooth wheel mode without VVT control, it will use the cam sensor for determining engine phase at startup, then ignore the cam sensor after phase has been established until the engine loses sync with the crank trigger. With the missing tooth wheel mode, the MS3 already has a positive way of telling if it has been able to maintain sync or not - it's virtually impossible to get a noise pattern that would maintain sync by accident.

Some other spark modes require checking the cam signal every crank revolution - sometimes because the spark mode requires it and sometimes because coding in the cam signal ignoring behavior would add complications.

I can't speak for how other ECUs handle this.

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PostPosted: Fri Apr 30, 2021 7:21 am 
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Great, thanks for clarifying, Matt. I was not considering an algorithm that would use the missing tooth wheel that way. Makes perfect sense.

Lou

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PostPosted: Fri Apr 30, 2021 10:29 am 
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So My question is would the fuel pump node work for triggering in Full sequential mode?

Sequential spark and Injection?

I have 6 coils on Ruster but they are currently wasted spark.


Greg

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PostPosted: Fri Apr 30, 2021 11:33 am 
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I figured that was the whole idea. Matt can confirm.

Lou

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PostPosted: Fri Apr 30, 2021 3:01 pm 
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Supercharged

Joined: Thu May 12, 2005 11:50 pm
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I was just trying to determine if the fuel pump lobe was 'good enough' so there would be no need to grind away at it..........

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PostPosted: Wed May 05, 2021 5:08 am 
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Location: Lawrenceville, GA
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Correct, it will work without modifying the lobe when combined with a 36-1 crank trigger.

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1966 Dodge Dart turbo / EFI project


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