Datalog N54 timing corrections while coasting and light throttle

[LazySoo335i]

LazySoo335i submitted a new graph:

N54 timing corrections while coasting and light throttle

Hey guys I'm chasing an issue I can't figure out.
2007 335i 6mt. Only mods are MHD and a dual cone intake.
Under coasting and light throttle I'm experiencing a surging or bucking kind of feeling. It disappears on deceleration or harder acceleration. I replaced the vanos solenoids but that didn't help. Car is healthy otherwise besides some wastegate rattle.

View this graph...

 

[Torgus]

How old and what rev are your injectors? Same question on your plugs but I doubt that is it if it goes away when WOT.

Stock CP?

 

[suspect]

Did you ever figure out why you are getting corrections? I have got similar corrections around the same load you have.

 

[That4chanhackerguy]

Did you ever figure out why you are getting corrections? I have got similar corrections around the same load you have.

This is normal behavior and you should be seeing them all over the place with normal driving especially highway driving.

 

[carabuser]

Yeh it's normal in stock maps. It's VANOS overlap that causes that, since reducing it, I no longer have those issues. The EGR effect is probably good for emissions but not great for a smooth running engine.

 

[suspect]

This is normal behavior and you should be seeing them all over the place with normal driving especially highway driving.

Yeh it's normal in stock maps. It's VANOS overlap that causes that, since reducing it, I no longer have those issues. The EGR effect is probably good for emissions but not great for a smooth running engine.

Thanks for the reply but I am not getting these on stock maps (stage 0) or barely any. These corrections are happening on v9/v10 stage 1 91oct/95ron. I tried posting a thread but its stuck for approval. I have been looking at my logs and I can't see why. The corrections only happen on light load. The STFT are not far off but within +/-10%. The timing cyl 1*crk is around 20 during light load and 6 at high RPM under WOT. The same corrections happen on cylinders with new #12 injectors too. Using 99RON (93+ oct) fuel too.

 

[suspect]

stg1

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[suspect]

stg0

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[That4chanhackerguy]

Totally normal. Nothing to worry about. Only focus on timing correction in a full pull and even then for reference not absolute since there are many other parameters to watch as well. As carabuster said it’s vanos overlap. Don’t stress it. But a better question what brought on the journey to search here?

 

[suspect]

Totally normal. Nothing to worry about. Only focus on timing correction in a full pull and even then for reference not absolute since there are many other parameters to watch as well. As carabuster said it’s vanos overlap. Don’t stress it. But a better question what brought on the journey to search here?

Thank you.
Because MHD app says "upload to spoolstreet" so I searched here lol. Also theres some good info here about self tuning.