VCDS boost log.. Is this right?

[NathanGrayW]

I just bought the car on Monday. It came with an aftermarket exhaust, a (ugly) Reiger body kit that has Rennen stamped on it, and a Rennen Tunning badge on the side of the car.
I decided I would check the boost to see if it actually had been tuned.

I measured block 115 from a 2k-6k 3rd gear pull. Atmospheric pressure atm is 30.07 inhg, which converts to 1018 mbar.

I got a max boost of 2370-1018 = 1352 which equals about 19.6 psi...

The average looks around to be around 2000, which would equal 14 psi..



The graph itself looks good, atleast to my un-trained eye. The requested boost and actual boost are almost identical.

Did I do my math/procedure wrong? Or am I actually getting a 19psi peak and around 14 psi avergae?


I read stock was around 9.

Here's the data from the log.
https://drive.google.com/file/d/0B1z...it?usp=sharing

[old guy]

You are correct. You do not have stock tuning. What color are the fuel injectors?

[texasboy21]

The average is lower than the peak pressure numbers because the boost on a stock turbo tapers towards redline.

[NathanGrayW]

You are correct. You do not have stock tuning. What color are the fuel injectors?

They're blue.

If they're actually blue, that means they're for Stage 1+ tunes, correct?

[old guy]

That is correct. Congratulations! An unexpected bonus.

[NathanGrayW]

That is correct. Congratulations! An unexpected bonus.

Is there anything else I should look for?
I'm relatively new to performance mods..


Sent from my One M8 using Tapatalk

[old guy]

You can check to see if you are running a stock intercooler or something upgraded. You can also check to see if your coil packs and diverter valve have been upgraded. Take a picture of a coil pack or at least post the part number on the coil pack and someone can tell you if it has been changed out. The DV is a bit harder to see. If it appears to be metal it has definitely been upgraded.

[NathanGrayW]

Is there anyway to figure out what type of tune it is?

Intercooler is stock. Coil packs are definitely stock, via the part number.

I think I can see the DV, but it's kind of awkward because the hood strut is bad..

[Luxus Panzer]

COOL!

How do I use my Vag com to make a graph like this?

[NathanGrayW]

Open up VCDS and goto Engine -- Meas. Blocks -- hit log, type where you want to save it and hit start when you're ready

[Luxus Panzer]

right on.

so log meas block 115 and it will save it as the spread sheet?

Then I use a seperate program to convert it to the graph I take it?

[NathanGrayW]

Yup, I just opened it in Excel and graphed the Rpm, Req. Boost, and Actual boost.

[Luxus Panzer]

ok.. my turn.

I did a 2K to 6K pull in 3rd gear and dumped this log....how does one create a graph from the data??

Monday 9 June 2014 14:56:49:45743 VCDS Version: Release 12.12.2 Data version: 20140212
8E0 909 518 AK 1.8L R4/5VT G 0006

Group A: '115 Group B: Not Running Group C: Not Running
Engine Speed Engine Load Boost Pressure Boost Pressure
TIME (G28) (specified) (actual) TIME TIME
Marker STAMP /min % mbar mbar STAMP STAMP
0.14 3120 92.5 1330 1330
0.31 3120 92.5 1340 1340
0.48 3160 94 1390 1330
0.65 3200 97.7 1480 1340
0.82 3240 109 1510 1510
0.99 3280 111.3 1530 1600
1.17 3360 112 1520 1610
1.34 3360 111.3 1520 1590
1.52 3400 111.3 1530 1580
1.7 3480 110.5 1530 1550
1.87 3520 109.8 1540 1560
2.04 3560 109 1540 1540
2.22 3600 108.3 1540 1530
2.39 3640 108.3 1540 1550
2.56 3680 109 1540 1540
2.73 3720 108.3 1540 1560
2.9 3760 109 1550 1560
3.08 3800 109 1540 1560
3.24 3840 109.8 1530 1550
3.42 3880 109 1530 1560
3.59 3920 109 1530 1550
3.76 3960 109 1530 1530
3.93 4000 109 1530 1540
4.1 4040 109 1530 1530
4.27 4080 109 1530 1530
4.43 4120 109.8 1540 1530
4.6 4160 109 1530 1550
4.78 4160 108.3 1530 1550
4.95 4200 109 1530 1540
5.12 4240 109 1530 1530
5.3 4280 109 1540 1530
5.47 4320 109 1540 1530
5.64 4360 109 1540 1530
5.81 4400 109.8 1530 1530
5.98 4440 109.8 1530 1520
6.15 4480 110.5 1530 1530
6.32 4520 110.5 1530 1540
6.49 4560 111.3 1540 1540
6.65 4600 110.5 1540 1540
6.82 4640 110.5 1540 1520
6.99 4680 109.8 1540 1530
7.15 4680 111.3 1530 1530
7.32 4720 111.3 1540 1530
7.49 4760 112 1540 1530
7.65 4800 112.8 1540 1520
7.82 4840 112.8 1540 1530
8 4880 112.8 1540 1520
8.17 4920 113.5 1540 1520
8.34 4960 113.5 1540 1520
8.51 5000 114.3 1540 1520
8.69 5040 115 1540 1510
8.86 5080 115 1530 1510
9.03 5120 115 1530 1510
9.2 5120 115 1520 1510
9.37 5160 115 1520 1500
9.54 5200 115.8 1510 1510
9.71 5240 115.8 1500 1520
9.89 5280 115.8 1500 1510
10.06 5320 115.8 1490 1490
10.23 5360 115.8 1490 1490
10.4 5360 115.8 1480 1480
10.57 5400 115 1480 1490
10.75 5440 115 1480 1480
10.92 5480 114.3 1470 1470
11.09 5520 115 1470 1470
11.27 5560 115 1470 1470
11.44 5560 115 1470 1470
11.61 5600 115 1460 1470
11.78 5640 114.3 1460 1460
11.95 5680 115 1460 1470
12.12 5720 115 1460 1440
12.29 5720 115 1460 1450
12.46 5760 115 1460 1460
12.62 5800 114.3 1460 1430
12.79 5800 114.3 1460 1450
12.96 5840 113.5 1450 1420
13.14 5880 112.8 1450 1440
13.31 5920 112.8 1450 1440
13.48 5960 112 1420 1440
13.65 5920 42.9 990 1580
13.83 5720 13.5 990 1300
14 5520 14.3 990 1190
14.17 5360 14.3 990 1140
14.34 5240 13.5 990 1110
14.52 5080 13.5 990 1090
14.68 4960 13.5 990 1070
14.86 4800 12.8 990 1060
15.03 4640 12.8 990 1060
15.2 4520 12.8 990 1050
15.37 4440 12.8 990 1040
15.54 4280 13.5 990 1040
15.71 4200 12.8 990 1040
15.87 4120 13.5 990 1030
16.04 4000 13.5 990 1030
16.22 3800 14.3 990 1030
16.39 3520 14.3 990 1030
16.56 3280 14.3 990 1030
16.73 3000 14.3 990 1030
16.91 2760 14.3 990 1030
17.08 2520 13.5 990 1030
17.25 2280 14.3 990 1020
17.42 2080 14.3 990 1020
17.59 1840 15 990 1020
17.76 1600 15 990 1020
17.93 1400 15.8 990 1010
18.11 1320 17.3 990 1010
18.28 1240 18.8 990 1010
18.45 1160 19.5 990 1010
18.62 1120 20.3 990 1000
18.79 1040 21.1 990 10


I used my Google fu and found out about the F11 key in excel.... did I do this right??

[NathanGrayW]

ok.. my turn.

I did a 2K to 6K pull in 3rd gear and dumped this log....how does one create a graph from the data??

Monday9June201414:56:49:45743VCDS Version: Release 12.12.2Data version: 20140212
8E0 909 518 AK1.8L R4/5VT G 0006

Group A:'115Group B: Not RunningGroup C: Not Running
Engine SpeedEngine LoadBoost PressureBoost Pressure
TIME(G28)(specified)(actual)TIMETIME
MarkerSTAMP /min % mbar mbarSTAMPSTAMP
0.14312092.513301330
0.31312092.513401340
0.4831609413901330
0.65320097.714801340
0.82324010915101510
0.993280111.315301600
1.17336011215201610
1.343360111.315201590
1.523400111.315301580
1.73480110.515301550
1.873520109.815401560
2.04356010915401540
2.223600108.315401530
2.393640108.315401550
2.56368010915401540
2.733720108.315401560
2.9376010915501560
3.08380010915401560
3.243840109.815301550
3.42388010915301560
3.59392010915301550
3.76396010915301530
3.93400010915301540
4.1404010915301530
4.27408010915301530
4.434120109.815401530
4.6416010915301550
4.784160108.315301550
4.95420010915301540
5.12424010915301530
5.3428010915401530
5.47432010915401530
5.64436010915401530
5.814400109.815301530
5.984440109.815301520
6.154480110.515301530
6.324520110.515301540
6.494560111.315401540
6.654600110.515401540
6.824640110.515401520
6.994680109.815401530
7.154680111.315301530
7.324720111.315401530
7.49476011215401530
7.654800112.815401520
7.824840112.815401530
84880112.815401520
8.174920113.515401520
8.344960113.515401520
8.515000114.315401520
8.69504011515401510
8.86508011515301510
9.03512011515301510
9.2512011515201510
9.37516011515201500
9.545200115.815101510
9.715240115.815001520
9.895280115.815001510
10.065320115.814901490
10.235360115.814901490
10.45360115.814801480
10.57540011514801490
10.75544011514801480
10.925480114.314701470
11.09552011514701470
11.27556011514701470
11.44556011514701470
11.61560011514601470
11.785640114.314601460
11.95568011514601470
12.12572011514601440
12.29572011514601450
12.46576011514601460
12.625800114.314601430
12.795800114.314601450
12.965840113.514501420
13.145880112.814501440
13.315920112.814501440
13.48596011214201440
13.65592042.99901580
13.83572013.59901300
14552014.39901190
14.17536014.39901140
14.34524013.59901110
14.52508013.59901090
14.68496013.59901070
14.86480012.89901060
15.03464012.89901060
15.2452012.89901050
15.37444012.89901040
15.54428013.59901040
15.71420012.89901040
15.87412013.59901030
16.04400013.59901030
16.22380014.39901030
16.39352014.39901030
16.56328014.39901030
16.73300014.39901030
16.91276014.39901030
17.08252013.59901030
17.25228014.39901020
17.42208014.39901020
17.591840159901020
17.761600159901020
17.93140015.89901010
18.11132017.39901010
18.28124018.89901010
18.45116019.59901010
18.62112020.39901000
18.79104021.199010


I used my Google fu and found out about the F11 key in excel.... did I do this right??

Unless you're pushing like 100psi, I don't think so.. haha

Post your .csv file you opened in excel and I'll make a graph

Sent from my HTC One_M8 using Tapatalk

[Luxus Panzer]

https://drive.google.com/file/d/0B68...it?usp=sharing

Thanks man.

[NathanGrayW]

Gray is requested, Yellow/Orange is Actual, and Blue is RPM

I've never seen a stock graph, but you're looking at around 8psi all the way across.

[diagnosticator]

When graphing log data, the X axis should be the "dependent" variable, usually RPM, and the Y axis should be the logged data of interest, in this case, boost pressure in psig or bar units. The scaling of the graph is important for showing the detail as well. If the scale range is not wide enough, details in the data, will not be shown in the graph. I don't see boost pressure on any of the graphs Y axis or RPM on any of the X axis of the graphs in this thread so far. The X and Y axis variables are setup in the graphing application or by the arrangement of the spreadsheet lines vs columns.

[NathanGrayW]

When graphing log data, the X axis should be the "dependent" variable, usually RPM, and the Y axis should be the logged data of interest, in this case, boost pressure in psig or bar units. The scaling of the graph is important for showing the detail as well. If the scale range is not wide enough, details in the data, will not be shown in the graph. I don't see boost pressure on any of the graphs Y axis or RPM on any of the X axis of the graphs in this thread so far. The X and Y axis variables are setup in the graphing application or by the arrangement of the spreadsheet lines vs columns.

Could you show an example?

I thought putting RPM on the y-axis was good, and showing boost in the same. So you can see what boost compared to your RPM in a straight line.

Sent from my HTC One_M8 using Tapatalk

[customa4]

When you do logs you want to start from 3rd gear and pull to redline at WOT(Wide Open Throttle).

Here's a graph I made from the log you sent me.

[diagnosticator]

That graph is correct, what I expect to see. ^^