Hi all, I want to log boost on my TDI (actual vs requested), via VCDS, but I'm not sure which measuring block to use. I managed to do this ages ago................old age must be catching up with me!

VCDS supports these on my ECU.

;038-906-012-CL --- Engine

;Component:1 9l R4 EDC 0000SG 3359 Coding:00002

;Saturday 3 April 2010 19:55:25:12528

;VCDS Version: Release 908.2 Data version: 20100326

Group Field 1 Data type Field 2 Data type Field 3 Data type Field 4 Data type

1 903 /min RPM 4.4 mg/str Inj. Quantity 1.700 V Voltage 54.0°C Temperature

2 903 /min RPM 0.0 % Load 0 1 1 Bin. Bits 54.0°C Temperature

3 903 /min RPM 265.0 mg/str Mass Air / Rev. 255.0 mg/str Mass Air / Rev. 59.0 % Duty Cycle

4 903 /min RPM 0.4 °BTDC Ign. Timing 1.8 °BTDC Ign. Timing 2.8 % Duty Cycle

5 903 /min RPM 23.6 mg/str Inj. Quantity 1.5 °BTDC Ign. Timing 54.0°C Temperature

6 0.0 km/h Speed 0 0 0 Bin. Bits 0 Bin. Bits 255 (no units)

7 28.8°C Temperature 20.7°C Temperature 54.0°C Temperature

8 903 /min RPM 0.0 mg/str Inj. Quantity 31.2 mg/str Inj. Quantity 22.0 mg/str Inj. Quantity

9 903 /min RPM 0.0 mg/str Inj. Quantity 51.0 mg/str Inj. Quantity

10 260.0 mg/str Mass Air / Rev. 979.2 mbar Absolute Pres. 989.4 mbar Absolute Pres. 0.0 % Load

11 903 /min RPM 999.6 mbar Absolute Pres. 989.4 mbar Absolute Pres. 19.9 % Duty Cycle

12 11111111 Bin. Bits 0 (no units) 13.98 V Voltage 54.0°C Temperature

13 -0.21 mg/str Inj. Quantity 0.00 mg/str Inj. Quantity 0.00 mg/str Inj. Quantity 0.24 mg/str Inj. Quantity

14

15 903 /min RPM 4.0 mg/str Inj. Quantity 0.50 l/h Fuel Consump. 0.0 mg/str Inj. Quantity

16 40.0 % Load 10000001 Bin. Bits 0 Bin. Bits 13.98 V Voltage

17

18 0.0 km/h Speed 1 Bin. Bits

19 0.740 V Voltage 4.500 V Voltage

20 903 /min RPM 4.4 mg/str Inj. Quantity 1.740 V Voltage 0.0 % Load

21 265.0 mg/str Mass Air / Rev. 260.0 mg/str Mass Air / Rev. 60.2 % Duty Cycle 011 000 Bin. Bits

22 0.4 °BTDC Ign. Timing 1.8 °BTDC Ign. Timing 2.8 % Duty Cycle 0.0 km/h Speed

23 999.6 mbar Absolute Pres. 989.4 mbar Absolute Pres. 19.9 % Duty Cycle 979.2 mbar Absolute Pres.

24 28.8°C Temperature 20.7°C Temperature 54.0°C Temperature 255 (no units)

Cheers, Baz.

It's block 11 - requested VS actual boost.

Duty cycle is also good to log in the same block. It should be around 75% at full throttle at 4000rpm.

It's block 11 - requested VS actual boost.

Duty cycle is also good to log in the same block. It should be around 75% at full throttle at 4000rpm.

Thanks Jason Do you know what block 19 measures ?

I logged this on my dads car, first value as 0.6v ish second was 0v.....hence the question.

Thanks again.

Baz.

I can honestly say I have no idea!

I only know about MB11 as its a key block to measure when my tuning is sorted out over the internet. Without the car to hand, MB11 gives the tuner the perfect insight into how the car is behaving.

Thanks Jason Do you know what block 19 measures ?

I logged this on my dads car, first value as 0.6v ish second was 0v.....hence the question.

Thanks again.

Baz.

It was the meassure voltage on the regulator in the Diesel pumps, on a non PD engine.

It should be 0.500v to 0.970 volt, with the engine off and ignition on.

Been meaning to go out and do some logging.

What's best to get some accurate and useful data - log from spoolup in 2nd or 3rd to 4500rpm say? And repeat a few times...

Steve