Help me understand MHD data log

[corp]

Here are a couple of short runs I did. CSV files above each of the respective graphs. I hope this works.

CSV - 19:49
>>>> MHD Log 19_49

CSV - 20:05
>>>> MHD Log 20_05

CSV - 20:11
>>>> MHD Log 20_11

 

[osiris]

I may be reading this wrong but your boost is very eratic and doesn't seem to meet boost requirement very often it always seems to be +1psi less than target?

Next thing I noticed when I compare your CSV log to mine is your torque readings are very low. My car has stock software and I am getting readings of 475nm which equated to 400nm on the HM dyno.

Someone else more experienced than me with this needs to chime in here as I'm just looking at figures and comparing to my cars MHD Log file. :sorry:

I don't know if anyone has asked you already but do you have waste gate rattle?

 

[corp]

I don't hear any wastegate rattle.


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[//M SPORT]

I am quite armature with this, but I just read the first log and fueling seems ok, boost seems ok at all rpm. This log shows peak boost over 10.5psi and these operate quite close to boost target so don't see any turbo issues, or fueling for that matter.

Perhaps someone could assist with interpretation of the timing?

 

[Kish2604]

Here are a couple of short runs I did. CSV files above each of the respective graphs. I hope this works.

CSV - 19:49
>>>> MHD Log 19_49

CSV - 20:05
>>>> MHD Log 20_05

CSV - 20:11
>>>> MHD Log 20_11

thanks for this... can you post the datazap links?

 

[corp]

thanks for this... can you post the datazap links?

Sure thing :coolShake:

Here they are in order:

>>>> Datazap 19:49

>>>> Datazap 20:05

>>>> Datazap 20:11

 

[Kish2604]

i must firstly say i am not 100% comfortable with mhd logs, however from what you posted i am not seeing anything screaming out and saying there is a problem. my concern is that your about 1 psi below target mostly and that your max wgdc is around 60% at max rpm... that is slightly higher than should be expected for that psi delivered. i would investigate your vacuum pipes, clamps and connectors for wear as a starting point and go from there.

 

[osiris]

I agree with this.

I actually replaced all my vacuum lines last week, every single one and it most definitely made a difference.

When my new turbos were first fitted I still had waste gate rattle and the car would idle funny and behave badly, I then replaced all the vacuum lines and the problem went away completely, There was definitely a vacuum leak that was causing the waste gate to not close properly.

 

[corp]

Thanks, chaps. I read on some other forums that guys where getting WGDC averaging around 50-ish percent even under full tilt and that was the norm.

I can find plenty of links with vacuum lines replacements and etc for N54 motors but haven't seen anything for N55.

Is there a thread on here or have you guys seen one somewhere else? I would like to have a good source before I tackle it myself. Don't want my ignorance cause me to yank out incorrect lines and etc.


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[corp]

I just read on 1addicts forum that N55s don't have vacuum lines.

Is this true?

What am I supposed to check then if that is the case?

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[Kish2604]

N55 e series is pneumatic... Early N55 f series is also pneumatic and then changed to electric

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[corp]

I thought it might be but wasn't sure.

So there would be at least one pipe going to the wastegate? Anything else?


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[Twinz]

As per Kish. Your logs are normal.

Flash the car with the appropriate MHD fueling stage flash and enjoy the car. Start worry when you lose power at 25psi not 9psi :rollsmile:

 

[corp]

FYI, to everyone that has responded this far, I really do appreciate the assistance.

This car is a steep learning curve for me.


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[osiris]

I'm going to be the naysayer here and tell you to rather fix your car before messing with software. Your car should be running 100% in stock form before messing with software in my opinion.
By putting on software you could escalate the problem further.

A stock n55 335i making 158 - 167kw isn't right. The logs may not be telling everything.
There could be something wrong that you just wont pick up in the logs.
For instance my car is stock and I'm only boosting 8psi and it peaks at 9psi during shifts yet I'm making allot more power than you?

 

[Kish2604]

Osiris...

your dealing with two different kettle of fish as these are two totally different motors... N54/N55

 

[osiris]

Osiris...

your dealing with two different kettle of fish as these are two totally different motors... N54/N55

I understand that, but N55 making that power surely means its not healthy?

You guys yourself said something isn't right looking at the dyno sheet.

To just up the boost to remedy the problem via a map doesn't sound like the right approach?

Surely?

 

[Kish2604]

No, dont wrongly quote me here...

i said nothing screams out as being wrong and the only concern was the slightly lower than target boost vs wgdc. I suggested the OP check his vacuum pipes and go from there. other than that he could have badly carbonised intakes, blocked cats, old plugs, a dirty fuel filter etc etc... it is only as he works through the car will he find his way around the problems he is experiencing.

 

[osiris]

I think we getting off on the wrong foot here...My apologies if I seem like I'm wrongly quoting you.

Those are good things to go through to be honest. The carbon build up could be a factor here. I didn't know the N55 also suffered from this problem.

 

[Kish2604]

Its all good...:coolShake: