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junior
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Last seen: 3 weeks 3 days ago
Joined: 08/26/2014 - 08:51
Help me find the fuel / ignition cut !?!??

The cut occurs just after 2:40 mark.  Spark and fuel prob go to zero, but I have searched all over the log and can't see why.  None of the engine protections seem to be triggered.  Its not a boost cut.  No traction control is enabled. I'm stumped.

Hoping one of you guys will see something I'm missing here.

919191.itlog

919191.itssn

 

AEM_JG
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Last seen: 6 days 7 hours ago
Joined: 06/03/2016 - 08:12
You are hitting the Overboost

You are hitting the Overboost Cut. If you look in the Setup Wizard under Engine Protection, there is an "Overboost Allowed" value which you have set to 35kPa. Your target boost is 187kPa and you are making 221kPa+ and the cut occurs. The cut remains active until you release the throttle below the 30% threshold set in the parameter below. Either raise your Overboost Allowed limit or try and tune out the boost spike and the fuel/ignition cut will go away. Your boost reaches as high as 240kPa which is 57kPa over you target boost. The cut starts as soon as your boost hits 218kPa and continues to hold the cut until you decrease throttle below 30%.

Hope this helps.

junior
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Last seen: 3 weeks 3 days ago
Joined: 08/26/2014 - 08:51
Ah I should have looked there

Ah I should have looked there, as that has gotten me before.  I don't typcially leave my units in kpa but in PSI.  What would be super nice is that when in imperial units that value for over boost protect was a value over atmosphere instead of absolute.  It gets me everytime.   So when in Pressure to allow 5 psi overboost I actually want to set the value at -9.7 correct?

Maybe when I set that function I should just change my units to KPA so that I can make proper sense of it and then switch back to psi when I'm done.  

Def
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Last seen: 2 weeks 3 days ago
Joined: 09/14/2014 - 10:21
1 psi = ~6.9 kPa 

1 psi = ~6.9 kPa 

 

You can round to 7 kPa = ~1 psi for easy reference. So wanting 5 psi overboost is equal to your 35 kPa overboost allowed. 

 

It sounds like you need to tune your boost target/base duty maps and maybe the PID values for boost control.