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UrS6

December 20th, 2016, 18:09

<tbody>
Tuesday
20
December
2016
11:42:07:26227-VCID:2F7004B8BD7B3F3A09-5140
VCDS Version: Release 16.8.0
Data version: 20160803 DS255

4D1 907 558 D

4.2l V8/5VT G 0003

Group A:
'003

Group B:
'031

Group C:
'115

Engine Speed
Mass Air Flow
Throttle Valve Angle
Ignition

Lambda Control
Lambda Control
Lambda Control
Lambda Control

Engine Speed
Engine Load
Boost Pressure
Boost Pressure

TIME
(G28)
(G70 + G246)

Timing Angle
TIME
Bank 1 (actual)
Bank 1 (specified)
Bank 2 (actual)
Bank 2 (specified)
TIME
(G28)

(specified)
(actual)

Marker
STAMP
/min
g/s
%
°BTDC
STAMP
V
V
V
V
STAMP
/min
%
mbar
mbar

0.29
2520
8.97
2.7
3.8
0.46
0.005
0.000
0.000
0.000
0.11
2520
7.5
1020.0
1040.0

0.81
2440
9.25
3.1
3.0
0.98
0.000
0.000
0.000
0.000
0.63
2440
8.3
1020.0
1040.0

1.32
2360
7.89
2.4
46.5
1.49
0.010
0.000
0.005
0.000
1.15
2400
8.3
1020.0
1040.0

1.84
2360
30.00
9.8
41.3
2.01
0.695
0.000
0.640
0.000
1.67
2360
15.8
1020.0
1040.0

2.35
2400
47.47
13.7
34.5
2.52
0.200
0.000
0.670
0.000
2.18
2400
30.8
1020.0
1030.0

2.87
2480
41.06
12.2
25.5
3.04
0.660
0.000
0.735
0.000
2.70
2440
39.1
1020.0
1040.0

3.38
2480
20.86
6.3
12.0
3.56
0.820
0.000
0.805
0.000
3.21
2480
32.3
1020.0
1050.0

3.90
2440
12.53
2.4
46.5
4.07
0.050
0.000
0.045
0.000
3.73
2440
12.8
1020.0
1050.0

4.43
2400
9.69
2.4
28.5
4.60
0.015
0.000
0.015
0.000
4.25
2400
7.5
1020.0
1040.0

4.95
2320
7.19
2.0
24.8
5.12
0.010
0.000
0.005
0.000
4.78
2360
6.8
1020.0
1040.0

5.46
2280
6.06
2.0
24.0
5.63
0.015
0.000
0.010
0.000
5.29
2320
6.8
1020.0
1040.0

5.98
2240
10.00
2.7
2.3
6.15
0.000
0.000
0.005
0.000
5.81
2240
8.3
1020.0
1040.0

6.49
2200
9.33
2.7
2.3
6.67
0.005
0.000
0.000
0.000
6.32
2200
9.0
1020.0
1040.0

7.01
2120
9.14
3.1
1.5
7.18
0.000
0.000
0.000
0.000
6.84
2160
9.0
1020.0
1040.0

7.54
2080
9.22
3.1
1.5
7.71
0.000
0.000
0.000
0.000
7.35
2080
9.8
1020.0
1040.0

8.06
2000
9.56
2.7
1.5
8.23
0.000
0.000
0.000
0.000
7.88
2040
9.8
1020.0
1040.0

8.58
1960
7.22
2.0
42.8
8.76
0.005
0.000
0.005
0.000
8.40
1960
10.5
1020.0
1030.0

9.10
1880
9.31
3.5
39.0
9.28
0.045
0.000
0.055
0.000
8.93
1960
13.5
1020.0
1030.0

9.62
1920
16.53
6.3
38.3
9.79
0.775
0.000
0.785
0.000
9.45
1880
13.5
1020.0
1030.0

10.13
1920
29.19
9.8
32.3
10.31
0.760
0.000
0.685
0.000
9.96
1880
26.3
1020.0
1030.0

10.65
1920
30.44
10.2
31.5
10.82
0.095
0.000
0.655
0.000
10.48
1920
34.6
1020.0
1030.0

11.17
1960
30.97
10.2
32.3
11.34
0.750
0.000
0.095
0.000
10.99
1960
34.6
1020.0
1040.0

11.68
1960
32.28
10.6
31.5
11.85
0.710
0.000
0.705
0.000
11.51
1960
35.3
1020.0
1040.0

12.20
2000
48.17
13.7
32.3
12.37
0.755
0.000
0.785
0.000
12.03
2000
35.3
1020.0
1040.0

12.72
2040
47.00
14.1
32.3
12.90
0.135
0.000
0.560
0.000
12.54
2040
50.4
1020.0
1050.0

13.24
2120
54.64
16.5
32.3
13.42
0.095
0.000
0.090
0.000
13.07
2120
54.9
1020.0
1060.0

13.76
2200
44.17
13.3
20.3
13.93
0.120
0.000
0.080
0.000
13.59
2160
54.1
1020.0
1080.0

14.28
2240
35.22
10.6
33.8
14.45
0.695
0.000
0.730
0.000
14.10
2240
42.9
1020.0
1080.0

14.79
2240
23.36
8.2
28.5
14.96
0.705
0.000
0.755
0.000
14.62
2240
31.6
1020.0
1070.0

15.31
2200
14.53
5.1
18.8
15.48
0.815
0.000
0.835
0.000
15.13
2200
23.3
1020.0
1060.0

15.82
2120
7.92
2.4
44.3
15.99
0.045
0.000
0.070
0.000
15.65
2160
12.0
1020.0
1050.0

16.34
2080
11.97
3.5
42.8
16.51
0.330
0.000
0.725
0.000
16.17
2080
11.3
1020.0
1040.0

16.85
1960
17.33
6.3
39.8
17.02
0.785
0.000
0.775
0.000
16.68
2040
14.3
1020.0
1040.0

17.37
1960
10.97
4.3
40.5
17.54
0.720
0.000
0.710
0.000
17.20
1960
15.0
1020.0
1030.0

17.89
1880
10.86
3.9
39.8
18.07
0.710
0.000
0.710
0.000
17.72
1880
13.5
1020.0
1030.0

18.42
1840
9.42
3.5
39.8
18.58
0.040
0.000
0.035
0.000
18.23
1880
12.0
1020.0
1030.0

18.93
1760
10.19
3.5
38.3
19.11
0.045
0.000
0.050
0.000
18.76
1760
12.0
1020.0
1030.0

19.45
1680
27.03
9.4
30.0
19.61
0.745
0.000
0.760
0.000
19.26
1760
15.0
1020.0
1030.0

19.96
1720
27.97
9.4
21.8
20.13
0.750
0.000
0.260
0.000
19.78
1720
36.8
1020.0
1030.0

20.50
1720
27.31
9.0
30.8
20.67
0.105
0.000
0.710
0.000
20.31
1720
34.6
1020.0
1030.0

21.01
1720
20.94
7.8
25.5
21.18
0.685
0.000
0.090
0.000
20.84
1720
33.1
1020.0
1040.0

21.54
1720
15.50
5.5
19.5
21.71
0.725
0.000
0.780
0.000
21.37
1720
25.6
1020.0
1040.0

22.07
1680
12.64
4.7
24.0
22.23
0.085
0.000
0.665
0.000
21.88
1720
19.5
1020.0
1040.0

22.59
1640
10.97
3.9
36.8
22.77
0.085
0.000
0.070
0.000
22.42
1640
15.0
1020.0
1040.0

23.12
1640
35.36
11.0
12.0
23.29
0.825
0.000
0.800
0.000
22.94
1680
23.3
1020.0
1030.0

23.64
1680
35.67
11.8
29.3
23.81
0.745
0.000
0.700
0.000
23.48
1680
40.6
1020.0
1030.0

24.17
1720
29.44
9.8
30.8
24.34
0.110
0.000
0.105
0.000
23.99
1720
36.8
1020.0
1040.0

24.69
1760
28.53
9.4
30.8
24.88
0.070
0.000
0.070
0.000
24.52
1760
39.1
1020.0
1040.0

25.25
1840
51.44
15.7
29.3
25.43
0.790
0.000
0.810
0.000
25.06
1800
48.1
1020.0
1030.0

25.77
2000
78.44
97.3
26.3
25.94
0.680
0.000
0.760
0.000
25.59
1960
75.9
1760.0
1060.0

26.28
2200
89.08
100.0
26.3
26.45
0.795
0.000
0.795
0.000
26.12
2120
82.7
1890.0
1130.0

26.81
2440
108.86
100.0
25.5
26.98
0.875
0.000
0.870
0.000
26.62
2360
91.0
2020.0
1210.0

27.34
2680
130.31
100.0
21.0
27.51
0.885
0.000
0.885
0.000
27.15
2560
101.5
2180.0
1310.0

27.86
2920
164.19
100.0
16.5
28.03
0.880
0.000
0.895
0.000
27.69
2880
113.5
2280.0
1430.0

28.37
3240
217.50
100.0
12.0
28.56
0.880
0.000
0.900
0.000
28.20
3160
129.3
2270.0
1590.0

28.91
3640
284.11
100.0
10.5
29.09
0.885
0.000
0.900
0.000
28.73
3520
157.1
2280.0
1860.0

29.44
3960
300.72
100.0
6.0
29.61
0.885
0.000
0.900
0.000
29.26
3840
169.9
2270.0
1970.0

29.94
4280
330.00
100.0
11.3
30.12
0.895
0.000
0.900
0.000
29.78
4200
174.4
2260.0
1970.0

30.46
4600
363.44
100.0
5.3
30.63
0.890
0.000
0.895
0.000
30.29
4520
177.4
2250.0
1990.0

30.98
4920
364.08
100.0
8.3
31.15
0.905
0.000
0.900
0.000
30.81
4840
180.5
2170.0
1990.0

31.49
5240
364.08
100.0
9.8
31.66
0.870
0.000
0.880
0.000
31.32
5120
175.2
2100.0
1960.0

32.00
5560
364.08
99.6
15.8
32.18
0.860
0.000
0.865
0.000
31.85
5440
168.4
2030.0
1900.0

32.52
5840
364.08
100.0
16.5
32.69
0.860
0.000
0.870
0.000
32.35
5760
161.7
1980.0
1850.0

33.04
6080
364.08
100.0
15.0
33.21
0.850
0.000
0.860
0.000
32.87
6000
157.9
1960.0
1820.0

33.56
5360
16.81
3.5
19.5
33.73
0.750
0.000
0.755
0.000
33.39
5880
27.8
1020.0
2080.0

34.08
3960
17.08
4.3
3.8
34.24
0.710
0.000
0.585
0.000
33.91
4400
12.0
1020.0
1210.0

34.61
4160
17.86
4.3
24.0
34.78
0.540
0.000
0.730
0.000
34.42
4160
9.8
1020.0
1110.0

35.12
4000
13.75
4.7
24.0
35.29
0.010
0.000
0.010
0.000
34.95
4040
8.3
1020.0
1070.0

35.63
3840
13.47
4.3
5.3
35.80
0.005
0.000
0.005
0.000
35.46
3880
7.5
1020.0
1060.0

36.15
3720
13.61
3.9
5.3
36.32
0.000
0.000
0.005
0.000
35.98
3760
7.5
1020.0
1050.0

36.66
3640
12.92
3.9
5.3
36.83
0.000
0.000
0.000
0.000
36.49
3680
7.5
1020.0
1050.0

37.18
3560
11.78
3.9
5.3
37.35
0.000
0.000
0.000
0.000
37.01
3600
6.8
1020.0
1050.0

37.69
3520
13.36
3.9
4.5
37.87
0.000
0.000
0.000
0.000
37.52
3520
6.8
1020.0
1040.0

38.21
3440
12.81
3.9
4.5
38.38
0.000
0.000
0.000
0.000
38.04
3480
6.8
1020.0
1040.0

38.73
3360
10.97
3.5
4.5
38.92
0.005
0.000
0.000
0.000
38.55
3400
6.8
1020.0
1040.0

379.88
760
5.64
2.0
6.8
379.56
0.690
0.000
0.120
0.000
379.71
760
15.8
1020.0
1030.0

380.40
760
5.47
1.6
6.8
380.05
0.105
0.000
0.125
0.000
380.23
760
15.8
1020.0
1030.0

380.91
760
5.36
2.0
8.3
380.57
0.085
0.000
0.655
0.000
380.74
760
15.8
1020.0
1030.0

381.43
760
5.69
2.0
8.3
381.08
0.100
0.000
0.685
0.000
381.25
760
15.8
1020.0
1030.0

381.95
760
5.61
2.0
7.5
381.60
0.115
0.000
0.110
0.000
381.77
760
15.8
1020.0
1030.0

2
382.46
760
5.50
1.6
6.8
382.12
0.670
0.000
0.110
0.000
382.29
760
15.8
1020.0
1030.0

382.98
760
5.44
1.6
6.8
382.63
0.680
0.000
0.110
0.000
382.80
760
15.8
1020.0
1030.0

383.49
760
5.58
2.0
8.3
383.15
0.640
0.000
0.705
0.000
383.32
760
15.8
1020.0
1030.0

384.01
760
5.69
2.0
8.3
383.66
0.095
0.000
0.670
0.000
383.83
760
15.8
1020.0
1030.0

384.54
760
5.64
2.0
6.8
384.18
0.105
0.000
0.135
0.000
384.35
760
15.8
1020.0
1030.0

385.04
760
5.39
1.6
6.8
384.72
0.235
0.000
0.100
0.000
384.87
760
15.8
1020.0
1030.0

385.55
760
5.44
1.6
9.8
385.21
0.695
0.000
0.645
0.000
385.38
760
15.0
1020.0
1030.0

386.26
760
5.67
2.0
7.5
385.73
0.690
0.000
0.685
0.000
386.09
760
15.8
1020.0
1030.0

386.77
760
5.53
1.6
8.3
386.43
0.110
0.000
0.155
0.000
386.60
760
15.8
1020.0
1030.0

387.28
760
5.44
1.6
8.3
386.95
0.085
0.000
0.095
0.000
387.11
760
15.0
1020.0
1030.0

387.79
760
5.44
1.6
8.3
387.44
0.115
0.000
0.285
0.000
387.62
760
15.0
1020.0
1030.0

388.32
760
5.44
1.6
9.0
387.96
0.690
0.000
0.720
0.000
388.14
760
15.0
1020.0
1030.0

388.84
760
5.22
1.6
9.0
388.49
0.710
0.000
0.705
0.000
388.67
760
15.0
1020.0
1030.0

389.35
760
5.08
1.6
15.0
389.01
0.675
0.000
0.110
0.000
389.17
760
15.0
1020.0
1030.0

389.87
760
5.08
1.6
17.3
389.52
0.100
0.000
0.095
0.000
389.69
760
14.3
1020.0
1030.0

390.38
760
5.25
1.6
18.8
390.04
0.080
0.000
0.135
0.000
390.21
760
13.5
1020.0
1030.0

390.90
760
5.00
1.6
16.5
390.56
0.080
0.000
0.100
0.000
390.73
760
14.3
1020.0
1030.0

391.41
760
5.00
1.2
18.0
391.07
0.085
0.000
0.150
0.000
391.24
760
13.5
1020.0
1030.0

391.93
760
4.83
1.2
21.0
391.58
0.110
0.000
0.695
0.000
391.76
760
13.5
1020.0
1030.0

392.46
760
5.08
1.6
21.0
392.11
0.670
0.000
0.700
0.000
392.29
760
13.5
1020.0
1030.0

392.99
760
5.11
1.6
21.0
392.63
0.715
0.000
0.695
0.000
392.81
760
13.5
1020.0
1030.0

393.49
760
4.69
1.2
24.0
393.15
0.710
0.000
0.645
0.000
393.32
760
13.5
1020.0
1030.0

394.01
760
5.06
1.6
18.8
393.66
0.700
0.000
0.125
0.000
393.83
760
13.5
1020.0
1030.0

394.52
760
4.89
1.6
18.0
394.18
0.700
0.000
0.655
0.000
394.35
760
14.3
1020.0
1030.0

395.04
760
5.00
1.6
21.8
394.70
0.670
0.000
0.700
0.000
394.87
760
13.5
1020.0
1030.0

395.56
760
5.00
1.6
16.5
395.21
0.170
0.000
0.700
0.000
395.38
760
14.3
1020.0
1030.0

396.08
760
5.11
1.6
27.8
395.74
0.110
0.000
0.655
0.000
395.90
720
14.3
1020.0
1030.0

</tbody>

UrS6

December 20th, 2016, 18:33

This is a stage 1 tuned 6 speed. I'm getting a very low maf reading on one side MAF sensor. Switching the two doesn't change from one side or the other. I'm thinking a boost leak but found it yet. Any thoughts would be appreciated. Is it weird that the specified lambda is 0 through the whole thing?

nubcake

December 20th, 2016, 18:36

My guess is - there won't be "specified lambda voltage" when in open loop (WOT).
Could really use a "proper" me7logger log. :\

UrS6

December 20th, 2016, 18:45

But it does it at part throttle too

nubcake

December 20th, 2016, 21:04

But it does it at part throttle too

Well, I'm not that familiar with VCDS logging (I usually do everything with me7logger).
It looks like group 31 is supposed to output "lamsbg_w", which indeed is specified lambda value.

Well, then it could be that your bin is modded to remove that from diag output.
Either way, this really deserves more attention:
http://www.rs6.com/showthread.php/25190-****-Guide-on-How-to-Take-and-Graph-Logs-****
http://nefariousmotorsports.com/forum/index.php?topic=4830.0

UrS6

December 20th, 2016, 21:22

Well, I'm not that familiar with VCDS logging (I usually do everything with me7logger).
It looks like group 31 is supposed to output "lamsbg_w", which indeed is specified lambda value.

Well, then it could be that your bin is modded to remove that from diag output.
Either way, this really deserves more attention:
http://www.rs6.com/showthread.php/25190-****-Guide-on-How-to-Take-and-Graph-Logs-****
http://nefariousmotorsports.com/forum/index.php?topic=4830.0
I've downloaded it. I'll try to log it. I often see VCDS logs here so maybe someone else will chime in in the meantime.

lswing

December 20th, 2016, 22:02

I've seen a few hundred logs...never one with Lambda Specified as 0...assume it has to do with your wiring during the swap?

hahnmgh63

December 20th, 2016, 23:45

Were all O2 sensors coded out by chance? Your total Mass flow gets to 364 which is the max the combined will read but let's see your individual MAF readings. I would check the Intercooler on the low side as well as the Intercooler hoses from Turbo to Intercooler and the Short one from Intercooler to the Intake plenum. Been a while since I've logged, anyone know what the normal and/or Max individual MAF reading are?

nubcake

December 21st, 2016, 00:30

With a chipped car you can expect ~180-220 grams per MAF.
Difference of ~10% between banks is normal.

I think it has nothing to do with coded out O2 sensors, but something's indeed going on with the binary.
How does your group 32 look by the way?

makaveli42

December 21st, 2016, 01:04

Were you tuned by Daz per chance? My tune by him shows the lambda at 0 as well. Because he coded them out If it's a boost leak...it's not a big one. Try and smoke test it....and replace all the crappy cracked hoses with silicon ones.

UrS6

December 21st, 2016, 01:33

Not DAZ but that is interesting. I think I have a boost leak. Maybe the suction jet pump

UrS6

December 21st, 2016, 01:36

Were all O2 sensors coded out by chance? Your total Mass flow gets to 364 which is the max the combined will read but let's see your individual MAF readings. I would check the Intercooler on the low side as well as the Intercooler hoses from Turbo to Intercooler and the Short one from Intercooler to the Intake plenum. Been a while since I've logged, anyone know what the normal and/or Max individual MAF reading are?
One MAF reads much lower than the other so I think I have a boost leak. But why the 0.00 reading. Shouldn't there be a specified number. And I didn't know you could tune out front O2 sensors. Aren't they essential?

DHall1

December 21st, 2016, 04:45

Just taking a quick look

plenty of fuel at wot
timing ok
boost ok

does it perform ok

UrS6

December 21st, 2016, 14:50

Just taking a quick look

plenty of fuel at wot
timing ok
boost ok

does it perform ok

Seems down on power sometimes. Quick off the line, then chokes, then pulls hard again. I suspect a boost leak but have new IC, all new vacuum hoses. Going to smoke test it today and hope I'm not yanking the IM for the SJP

DHall1

December 21st, 2016, 16:08

Gotcha

target peak boost is alittle high and you didn't reach it in this log. What gear was this log performed

Try a 4th gear pull in turbo mode on the log.

Fueling is plenty good.

UrS6

December 21st, 2016, 16:17

Gotcha

target peak boost is alittle high and you didn't reach it in this log. What gear was this log performed

Try a 4th gear pull in turbo mode on the log.

Fueling is plenty good.
3rd gear. I'll try 4th.

UrS6

December 21st, 2016, 18:07

Another log. This is just blipping the throttle while parked in my driveway. Look at the difference in the two MAF readings. Bank 1 shows the same readings even if I swap MAFs. I'm going to test the MAF wires now but any othe ideas?

<tbody>
Wednesday
21
December
2016
12:55:14:26227-VCID:2F7004B8BD7B3F3A60-5140
VCDS Version: Release 16.8.4
Data version: 20161129 DS267.0

4D1 907 558 D

4.2l V8/5VT G 0003

Group A:
'002

Group B:
Not Running

Group C:
Not Running

Engine Speed
Engine Load
Mass Air Flow
Mass Air Flow

TIME
(G28)

(G70) Bank 1
(G246) Bank 2
TIME

TIME

Marker
STAMP
/min
%
g/s
g/s
STAMP

STAMP

0.02
760
17.3
1.56
4.58

0.16
760
17.3
1.67
4.56

0.33
760
17.3
1.78
4.56

0.50
760
17.3
1.75
4.47

0.68
760
17.3
1.75
4.33

0.86
760
17.3
1.64
4.33

1.04
760
17.3
1.83
4.33

1.21
760
17.3
2.03
4.44

1.38
760
17.3
1.94
4.19

1.55
760
17.3
1.92
4.19

1.72
840
18.8
2.72
4.72

1.89
1000
18.0
2.72
4.69

2.07
1120
16.5
2.39
4.78

2.24
1200
15.0
2.69
4.78

2.41
1200
14.3
2.53
5.08

2.58
1240
14.3
2.50
5.39

2.75
1240
14.3
2.42
5.78

2.92
1240
15.8
4.31
7.47

3.10
1360
18.8
5.00
8.31

3.27
1560
18.0
3.03
7.58

3.44
1400
12.8
0.14
7.25

3.61
1160
12.0
0.22
7.58

3.79
1040
13.5
1.28
8.00

3.96
1040
14.3
0.25
7.19

4.13
960
14.3
0.00
6.81

4.30
920
15.0
0.64
6.86

4.47
1000
20.3
4.47
8.58

4.65
1360
24.1
6.03
9.69

4.82
1680
22.6
5.08
9.92

4.99
1880
18.8
4.06
9.83

5.16
1920
14.3
0.00
7.47

5.33
1600
12.0
0.22
9.11

5.51
1280
12.8
0.00
9.56

5.68
960
12.8
0.00
9.53

5.85
840
24.1
4.86
11.19

6.02
1000
21.1
0.00
8.14

6.19
840
18.0
0.00
8.97

6.37
840
18.0
0.00
8.61

6.55
800
18.0
0.00
7.86

6.71
800
18.0
1.22
8.58

6.88
960
21.1
3.14
8.61

7.05
1200
24.1
6.47
10.58

7.23
1600
24.8
5.42
10.22

7.40
1800
16.5
0.00
8.06

7.57
1520
12.8
1.06
9.14

7.74
1200
12.8
0.00
9.36

7.91
920
14.3
4.94
13.72

8.09
880
26.3
5.39
11.56

8.26
1040
22.6
0.00
8.81

8.43
920
18.8
0.00
9.11

8.60
880
18.0
0.00
9.06

8.78
920
19.5
2.08
9.61

8.95
1120
24.1
6.28
11.36

9.12
1560
27.8
5.94
11.28

9.29
1840
18.8
0.00
8.89

9.46
1640
13.5
0.28
10.03

9.63
1280
12.8
0.00
10.03

9.81
1000
12.8
0.00
9.81

9.98
800
24.1
6.33
12.53

10.16
1080
23.3
0.00
8.72

10.34
920
19.5
0.00
9.56

10.51
920
18.8
0.00
9.47

10.68
880
18.8
0.00
8.61

10.84
920
19.5
2.11
9.03

11.02
1200
25.6
6.97
11.47

11.20
1600
26.3
5.19
11.08

11.38
1840
17.3
0.00
9.08

11.56
1680
12.8
0.06
10.25

11.73
1360
12.0
0.00
9.69

11.90
1080
12.8
0.00
10.03

12.07
800
21.8
6.69
12.78

12.24
1080
24.8
0.00
8.50

12.42
960
20.3
0.00
9.97

12.59
960
18.8
0.00
9.50

12.76
920
18.8
0.00
8.69

12.93
880
18.0
0.00
8.28

13.12
840
18.0
0.00
7.67

13.29
800
17.3
0.00
7.39

13.48
880
19.5
1.53
7.17

13.65
1080
21.8
3.50
8.47

13.82
1320
21.8
3.83
8.53

13.99
1520
19.5
2.92
8.17

14.16
1680
15.8
2.14
8.06

14.34
1680
13.5
0.11
7.97

14.51
1520
11.3
0.00
8.33

14.68
1320
12.0
0.33
8.67

14.85
1200
12.8
0.25
8.72

15.01
1120
14.3
0.72
8.94

15.20
1080
15.0
0.11
7.89

15.37
1000
15.0
0.00
7.33

15.54
960
15.0
0.03
7.17

15.71
1040
22.6
11.31
14.58

15.89
1640
41.4
18.11
22.00

16.06
2640
42.1
21.17
28.58

16.23
3080
21.8
0.00
19.11

16.40
2720
11.3
0.00
18.72

16.56
2360
9.0
0.00
18.64

16.73
2000
8.3
0.00
17.69

16.92
1680
10.5
0.00
15.53

17.09
1360
12.0
0.00
13.97

17.26
1080
12.0
0.00
12.86

17.43
800
20.3
4.64
13.11

17.61
1040
24.1
0.00
9.03

17.79
880
18.8
0.00
10.14

17.98
880
18.0
0.00
9.72

18.17
840
18.0
0.00
8.36

18.32
800
17.3
0.00
7.42

18.50
800
17.3
0.00
6.83

18.67
760
17.3
0.00
6.69

18.85
760
17.3
0.08
6.19

19.02
760
17.3
0.00
5.83

19.19
760
17.3
0.28
5.81

19.37
760
17.3
0.28
5.47

19.53
760
17.3
0.50
5.22

19.71
760
17.3
0.64
5.06

</tbody>

UrS6

December 21st, 2016, 19:36

I just checked all of the wiring from the MAF connectors back to the DME. All wires produced continuity. 5v signal is present on both MAFs. Swapping the MAFs does not change the condition which exists on the right bank (USA passenger side). I smoke tested the car and the only place it's smoke was apparent was on the very back of the valve cover gasket where there's a solenoid or something. But it was a very slight amount of smoke. And I was not able to pinpoint exactly where it was coming from.

UrS6

December 21st, 2016, 22:20

Would it make sense that this is infact some sort of electrics problem as the MAF keeps dropping out to 0? It seems that there would still be some air drawn through the MAF even with a large intake leak.

nubcake

December 21st, 2016, 22:29

Would it make sense that this is infact some sort of electrics problem as the MAF keeps dropping out to 0? It seems that there would still be some air drawn through the MAF even with a large intake leak.

Or something messed up in the software.

Other possibility would be reverse flow through MAF. It could happen if something's wrong with wastegate or bypass controls (turbos badly out of sync, etc).

P1054

December 21st, 2016, 22:29

Just my 2 cents, I'd agree that it sounds more like an electrical problem than a vacuum leak. Any chance you could extend the good side wire far enough to plug it into a MAF on the "bad" side? See if the readings are still low? I don't think the wire harness is long enough but it shouldn't be too hard to rig up an extension harness.

UrS6

December 21st, 2016, 23:01

Or something messed up in the software.

Other possibility would be reverse flow through MAF. It could happen if something's wrong with wastegate or bypass controls (turbos badly out of sync, etc).

Software seems unlikely. How do you check the wastegates? Pressure to the hoses off the n75? I think the passenger side WG Rod was being held up by an oil tube. I freed it up but the condition still exists.

UrS6

December 21st, 2016, 23:12

Just my 2 cents, I'd agree that it sounds more like an electrical problem than a vacuum leak. Any chance you could extend the good side wire far enough to plug it into a MAF on the "bad" side? See if the readings are still low? I don't think the wire harness is long enough but it shouldn't be too hard to rig up an extension harness.
Good idea. I can try that. If it's a leak it has to be between the MAF and the Y pipe, correct? All the air is blended after that, correct?

P1054

December 21st, 2016, 23:20

Yes. From the MAF, it goes to the turbo, then a short rubber hose, then a stainless hard pipe, then another rubber hose, then the intercooler, then another rubber hose, then the y-pipe, where it's blended and then flows into the throttle body.

UrS6

December 21st, 2016, 23:44

Yes. From the MAF, it goes to the turbo, then a short rubber hose, then a stainless hard pipe, then another rubber hose, then the intercooler, then another rubber hose, then the y-pipe, where it's blended and then flows into the throttle body.
If I cap and pressurize that it should hold air? Do I need to do anything with the wastegate to pressurize the MAF to y pipe? Any other thoughts before I isolate that area tomorrow?

nubcake

December 22nd, 2016, 00:50

Don't put too much pressure in the wastegate line or you'll pop the diaphragm! Avoid exceeding your "normal" boost pressure there.
EDIT: talking about testing just the "N75 to wastegates" line. But the primary clue for any failures there would be an overboost condition, you don't seem to have that.

If you can get me7logger running - try logging MAF1/MAF2 values or voltages along with boost pressure and ps_w (manifold pressure). It will tell a lot.

UrS6

December 22nd, 2016, 01:17

Don't put too much pressure in the wastegate line or you'll pop the diaphragm! Avoid exceeding your "normal" boost pressure there.
EDIT: talking about testing just the "N75 to wastegates" line. But the primary clue for any failures there would be an overboost condition, you don't seem to have that.

If you can get me7logger running - try logging MAF1/MAF2 values or voltages along with boost pressure and ps_w (manifold pressure). It will tell a lot.
I downloaded it just need to give it a try

UrS6

January 1st, 2017, 04:34

Don't put too much pressure in the wastegate line or you'll pop the diaphragm! Avoid exceeding your "normal" boost pressure there.
EDIT: talking about testing just the "N75 to wastegates" line. But the primary clue for any failures there would be an overboost condition, you don't seem to have that.

If you can get me7logger running - try logging MAF1/MAF2 values or voltages along with boost pressure and ps_w (manifold pressure). It will tell a lot.

nubcake, the instructions for the logger say that I need to download my original.B I N file. I have a custom tune that is locked so that I cannot read it. This presents two problems: one is that if I flashback to a stock tune I have to send my ECU to the tuner to be re-flashed with my custom software. Two, the software is locked and I'm not unable to unlock it. Is it absolutely necessary to have the same file in order to use this logger?

nubcake

January 1st, 2017, 12:32

nubcake, the instructions for the logger say that I need to download my original.B I N file. I have a custom tune that is locked so that I cannot read it. This presents two problems: one is that if I flashback to a stock tune I have to send my ECU to the tuner to be re-flashed with my custom software. Two, the software is locked and I'm not unable to unlock it. Is it absolutely necessary to have the same file in order to use this logger?

You don't need to flash the binary that you download. You just need it to present to logger so it can know memory locations for variables.
The simple option is to run the base file (with same binary version as your tuned one) through ME7info, so it can build the memory map. You can also ask your tuner to run the tuned binary through the ME7info and send you the .ecu file it outputs.
If both won't work, there still is an option. PM for details. :)

UrS6

January 16th, 2017, 20:53

Just my 2 cents, I'd agree that it sounds more like an electrical problem than a vacuum leak. Any chance you could extend the good side wire far enough to plug it into a MAF on the "bad" side? See if the readings are still low? I don't think the wire harness is long enough but it shouldn't be too hard to rig up an extension harness.

It looks like you are on to something here. I bought 2 new MAF connectors with wires and patched them into the opposite original MAF connectors on the car effectively creating an extension for the wiring and swapping the wiring for each side. My wonky MAF condition went to the other side. So it is not the MAF, or an air leak. It seems that somewhere between the connector plug and the ECU is the cause for my MAF dropping out. I traced the wiring back to the ECU connector for both MAFs and got good readings for continuity and voltage. But maybe it is a wire break or bad connection that is exacerbated by the motor running. Any thoughts? I'm going back out to retest the wiring from the MAF to the ECU.

PS Nubcake, i'm still going to install the NEF Moto logger but i suck at computer and haven't really sat down to get it set up. Given the most recent findings it seems I have almost found the problem though.

UrS6

January 16th, 2017, 22:45

A little more info......

Just a recap on the prob: VCDS and logs show the drivers MAF running much lower g/s reading when compared to the passenger side. Often it drops to "0.00 g/s". Passenger side reading goes up and down as expected with smooth consistent values. No fault codes

-Swapping the two MAFs does not swap the problem to the other side so it's not the MAF.
-Swapping the MAF connectors from one side to the other (passenger MAF plugged into the drivers side circuit) does swap the problem to the other side so we know it's not a boost leak, turbo/wastegate issue, etc.

There is some damage to the drivers side connector where the wires enter the plastic plug but it looks very minor. Rather than just cutting into the harness to replace it I ran some tests today. I don't want to hack the end of the harness off only to find out there is a broken wire in a different part of the loom. I used bentley Electrical wiring diagram on page EWD-271 diagram 28/12 at the bottom of the page as a reference.

The tests:

The MAF has a 5 connector plug with holes 2,3,4,5 populated. Results were the same on both drivers plug and passengers.

All female and male plugs look OK to the eye

circuit 2 to ground yields ~13.5 volts
circuit 3 to ecu pin 27 (ECU ground) results in continuity
circuit 4 to ground produces 5 volts
jumping circuit 4 to circuit 3 produces 5 volts
circuit 5 to ecu pin 29/109 (drivers side/passenger) produces continuity
unplugging the drivers MAF makes it idle more smoothly

So, continuity tests mean no broken wires, right? So what gives? Any help on this would be much appreciated. I just can't seem to figure out what the problem could be.

hahnmgh63

January 16th, 2017, 22:50

Maybe you were on to something when you said "engine running"? Might be a break in the wires close to the plug as there have been a few instances before of it happening as they bend around under the air filter. Engine Tourqe may cause the wire break to open and close the circuit intermittently.

UrS6

January 16th, 2017, 22:56

At this point maybe I should just redo the end of the harness and keep my fingers crossed? I hate to go hacking into an original harness without some evidence but maybe it's best to rule that out for now. I'm just concerned if I replace the last 6 inches and the problem is at the 10 inch mark.

nubcake

January 16th, 2017, 23:10

can't seem to figure out what the problem could be.

Custom code in the ECU writing to the "MAF value" memory area. A very long shot, but still a possibility.
If everything else fails (and if you have a backup of your current bin), you could try flashing the original binary.

EDIT: but yea, of course try playing with the wiring first. :)

UrS6

January 16th, 2017, 23:24

Custom code in the ECU writing to the "MAF value" memory area. A very long shot, but still a possibility.
If everything else fails (and if you have a backup of your current bin), you could try flashing the original binary.

EDIT: but yea, of course try playing with the wiring first. :)
Hope it's not that but I don't have a copy of the tune. I can get it but it involves me shipping the ECU which is a pain. And my tune is used on a bunch of cars so I'm assuming it's not that. I hope!

Aronis

January 17th, 2017, 13:38

How on earth did you get the wire to reach from drivers side to passenger side and vise versa???? Those friggen wires are soooooo short....

Mike

UrS6

January 17th, 2017, 13:51

How on earth did you get the wire to reach from drivers side to passenger side and vise versa???? Those friggen wires are soooooo short....

Mike
I bought new connectors with wires and patched them in.

AndyRS6

January 17th, 2017, 14:45

Where did you get them from with wires? I found only for 2.7 tt with wires.

Andriy

UrS6

January 17th, 2017, 15:54

Where did you get them from with wires? I found only for 2.7 tt with wires.

Andriy
http://m.ebay.com/itm/Mass-Air-Flow-Sensor-Connector-5-way-Fits-Audi-A4-TT-VW-Bettle-Golf-Jeta-Passat-/172313494676

UrS6

March 8th, 2017, 16:54

Problem solved: It seems that the small M6x1.0x15 bolts that hold the wastegate actuator on to the CHRA of the turbo were all missing. The result was that instead of the actuator rod exerting it's full force on the wastgate valve it was mostly moving the actuator back and forth. The net effect seems to be that the wastegate was always partially open/closed and never fully open/closed. So lack of boost and then overboost. The MAF seems to have been getting a reading from the trottle closing and the wastegate not fully opening which was causing reversion. I'm resetting the ECU and going out for a drive but measuring blocks for the MAF seem to be matched from side to side and there is not the drop to zero that was occuring before.

P1054

March 8th, 2017, 17:26

Well I'm glad to hear it was a relatively easy (or cheap anyway) fix after all that. Hope you're good to go for a while now!