BMW e36 M3 Support | AEM
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kevin325i
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Joined: 03/13/2016 - 12:58
BMW e36 M3 Support

I'm using a 508 controller for a 1998 e36 bmw. I'm trying to configure the cam and crank sensor inputs and when I edit the cam sync adjusment variable in infinity tuner the value is not held. I can change the value and save everything but once you close and reopen the value has returned to 0. I'm not sure if this variable can even be changed?

I'm using a hall effect cam and crank sensor. The 95 uses a VR crank sensor so I can't just use the 95 m3 supported pattern. The 96+ vs 95 cars have the same crank and cam paterns so I'm just trying to set the cam offset to the same as for the 95 m3. 

 

Basically all I need is a 96+ M3 cam crank pattern to be added that is for hall crank and hall cam sensors. Or how to change and configure the cam sync adjustment myself.

AEM_NS
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Last seen: 47 min 5 sec ago
Joined: 06/06/2014 - 09:31
What you're seeing with the

What you're seeing with the cam/crank wizard selection "not held" isn't what you think.  The wizard selection is still selected so it's still whatever you set it up to be (E36 M3 or 60-2 or whatever).  What's happening is that when you change the Cam Sync Adjustment or Trigger Offset values, the settings no longer match what the wizard considers to be your specific selection.  The wizard not only sets the cam/crank inputs but it also sets the CSA and TO values and if they change and go beyond a threshold that we set as still consider as being matched, then it will no longer match therefore it won't show the wizard selection BUT it is still selected.  Also, when you change CSA and TO, you must right click on the title bar for each item and select Initial Value.  The Initial Value is what gets loaded when the unit is power cycled.  If you don't change the Initial Value then when you power cycle the old value will come back like you're seeing.

The E36 M3 pattern that we support isn't unique at all.  It's just a 60-2 VR crank and a single Hall cam.  The only thing unique about the E36 M3 wizard selection is that it sets the CSA and TO for you.  We don't need to add the 96+ M3 timing pattern if it's the same pattern but with Hall sensors.  Just select Universal 60-2 Hall Crank & 1 Hall Cam and then sync the timing.  You don't necessarily need to manually adjust CSA and TO but you can if you set the Initial Values.  You can just use the Ignition Sync function in the wizard. 

kevin325i
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Joined: 03/13/2016 - 12:58
Perfect, thanks for the input

Perfect, thanks for the input. My main concern was the not being able to actually set the CSA anywhere. I have no problem just using the universal 60-2 hall/hall pattern.

kevin325i
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Joined: 03/13/2016 - 12:58
So one other quick question

So one other quick question about this. The universal 60-2 hall crank hall cam settings are both falling edge triggers. For the e36 m3 supported application the cam trigger is a rising edge signal.  Using the falling edge trigger means the ecu doesn't receive the sync signal until a full revolution later because the cam 'tooth' is 360* crank degrees wide. 

Is there a way to switch the input from falling to rising edge in infinity tuner?

AEM_NS
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Well it's been a few years

Well it's been a few years since we did the E36 app so I had to dig around in some old files to try and figure out why it's referencing the cam's rising edge and actually, I don't see any reason why it is.  There isn't a way for end users to change trigger edges but unless you have some compelling data that shows otherwise, there really shouldn't be a reason to not trigger on the cam's falling edge.

kevin325i
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Last seen: 2 years 1 month ago
Joined: 03/13/2016 - 12:58
That's my feeling too and

That's my feeling too and really the source of any confusion. Both the sensors should be falling edge trigger.

Only thing that came to mind is you could sync 360* faster when triggering on the rising edge because the cam trigger is so large. 

 

No matter though. I'll just continue using the universal patter. Thanks again.