Can anyone help me with these logs - MAF, N75 & Boost for fault finding.

[Big Tone]

I have tried logging both blocks 002 and 003 in order to attain a g/s reading from my MAF.

However, in VAG COM, the parameters/scale ranges from 2.0-4.0 g/s, and all readings recorded fall within this.

What am I doing wrong? Is there another Block?

Engine is AUM

[AaronGS]

What gear are you logging in? my AUM logs in block 002 have been okay, 2-4 at idle and then increase accordingly on WOT runs.

[Big Tone]

Ah, right, I see.

2-4 g/s at idle, then this will increase to 150+ on a 3rd/4th WOT run. yes?

Assuming everything is ok of course.

[Rhyso]

Ah, right, I see.

2-4 g/s at idle, then this will increase to 150+ on a 3rd/4th WOT run. yes?

Assuming everything is ok of course.

Correct   Best hit that private runway of yours 

3rd gear from 1200rpm to the redline and repeat 3-4 times to get an average reading 

[AaronGS]

Yep. and as rhys says, best to do on a private run way as WOT in 3rd to at least 6500rpm is not exactly slow...
Can you save logs? If not take some one with you as you do not want to be trying to look at the screen during this session!

[Rhyso]

Yep. and as rhys says, best to do on a private run way as WOT in 3rd to at least 6500rpm is not exactly slow...
Can you save logs? If not take some one with you as you do not want to be trying to look at the screen during this session!

Yep you can save them

There is also a little feature called the 'marker' which you click just before starting your run.  When you open the logs in excel you can quickly spot your full throttle runs as it puts an extra column and lists them 1,2,3 etc etc 

[AaronGS]

Aye but can you save logs if using just the free VCDS-lite with no support/registration? I forget, thats the only reason I mention it!

[Rhyso]

Aye but can you save logs if using just the free VCDS-lite with no support/registration? I forget, thats the only reason I mention it!

That I don't know 

[Big Tone]

Ah, right, I see.

2-4 g/s at idle, then this will increase to 150+ on a 3rd/4th WOT run. yes?

Assuming everything is ok of course.

Correct   Best hit that private runway of yours 

3rd gear from 1200rpm to the redline and repeat 3-4 times to get an average reading 

Going to burn some V-POWER!

Nicely

[Big Tone]

Just been out and used the runway

I did three logs;
2 in 3rd and 1 in 4th

Please see graphs and associated MAF logs below;

MAX MAF value about 150 g/s!!!! 196Bhp?

I suspect because the boost is not spiking that this is causing my 17705? as the difference between actual and requested is over 250mb, could the MAF be the cause?

First 3rd gear log;



Revs       MAF       N75  Boost-(Act)   Spec
1440   25.58   0   1050   1930
2800   95.25   77.6   1990   1980
3360   101.03   77.6   1920   1920
3840   111.42   77.6   1910   1900
4320   120.58   76.5   1890   1840
4680   127.33   74.9   1820   1790
5040   132.97   74.1   1750   1750
5360   140.39   75.3   1720   1730
5680   147.03   77.3   1720   1710
5480   13.19   0   1410   1000




Second 3rd WOT run



Revs       MAF     N7 5  Boost-(Act)    (Spec)
1760   25.83   0   1170   1870
1960   44.53   95.3   1330   1990
2280   69   95.3   1710   2040
2720   82.31   78.4   2080   2040
3160   98.97   78.4   2000   1930
3680   104.33   77.3   1910   1950
4080   116.75   78   1920   1880
4480   124.5   76.5   1900   1810
4920   128.94   74.1   1780   1770
5280   136.89   74.5   1730   1750
5600   145.33   75.7   1710   1740
5880   150.19   77.3   1750   1730
6200   152.89   78   1730   1710
6400   17.86   77.6   1700   1000
4400   8.72   0   1070   1000



First 4th WOT run



Revs       MAF     N75   Boost-(Act)    (Spec)
1560   27.69   0   1130   1360
1680   32.53   95.3   1290   1830
1840   39.14   95.3   1410   1970
2040   51.61   95.3   1580   2000
2240   65.03   95.3   1800   2020
2480   74.64   84.3   2050   2040
2760   84.61   79.2   2050   2050
3040   90.67   80   2040   1990
3320   98.92   78.4   1960   1930
3560   103.5   77.3   1940   1920
3840   106.39   77.3   1920   1930
4120   115.47   77.3   1920   1900
4360   120.31   76.5   1890   1870
4560   121.89   75.7   1860   1840
4760   124.69   74.9   1820   1830
4960   130.39   75.3   1800   1820
5120   133.14   76.1   1820   1810
5280   137.31   76.9   1790   1810
5440   143.28   78   1790   1810
5600   147.97   78.8   1810   1000
5560   10.58   0   1150   1000


MAF you think? Or N75? Or something else?

What about tweaking the N75 screw?

Once its boosts it boosts good, it is just sloppy getting there.