TDI Chip Tuning: Lupo Still Has No Power

Hello,
I took my Lupo, a 2001 model with a 1.4 TDI engine (engine code: AMF), with 98,000 km on the clock, to *** for a chip tuning. After about half a day, he called me and said that the car wouldn't show any performance gains. He also said that the car was too slow even in its standard configuration. The factory specifications state a 0-100 km/h time of 12.3 seconds, but mine measured 14.7 seconds without modification, and 14.6 seconds with the modification. So, what could be wrong? A friend of mine drives the exact same Lupo, so yesterday I did some test runs to compare air mass and boost pressure. The boost pressure curve is identical on both cars, but the air mass is different. What could be the cause? Could it be a fuel supply issue? What other data should I read out to rule out other potential sources of error? I would be grateful for any help.

The attached image shows my data on the left and my friend's data on the right, who apparently still has full performance. The measurements were taken from a standstill to approximately 150 km/h with full throttle in each gear. By the way, the engine is back to its standard configuration.

EDIT Mode: Removed irrelevant diagrams.

Hello,

Quote:

Because a friend of mine drives the exact same Lupo

.
Does it drive exactly as well, or exactly as poorly, or better?

I have removed the tuner name. Regarding the tuner name initial letters "D" and "K", one must be careful, as I am not entirely sure which is which, and there are different models with the same initial letters but different levels of expertise.

To help you, please provide the underlying CSV files (log files) from both vehicles, as we can't even see the software versions of the engine control units.

Please provide the German text you would like me to translate into English. I will also include "Autoscans with additions" as requested.

During the logging process, please use maximum data acquisition rate and record data block 1, 8, and 11 between 1500 rpm and 4000 rpm.

Best regards, Rainer.

"Yours is definitely performing better and is also much faster. Is it enough if I just post my results?"

Here are the CSV files.

Hello,

Yes, your values are sufficient, but they are not the ones that were requested.

Best regards, Rainer.

Here's the full-throttle experience.

Hello,

Since the boost pressure is okay, but the air mass readings are surprisingly low, your car will likely produce a lot of black smoke from the exhaust when you accelerate fully, right?

Best regards, Rainer.

Quite the opposite, it hardly smokes at all, or rather, my previous cars (a Passat 3BG V6 TDI and an A6 3.0 TDI) produced three times as much smoke.

Hello,

Assuming your LMM (likely referring to a mass airflow sensor) is functioning correctly, it's likely that the issue is a blockage. The measured airflow mass is less than half of the normal value, despite having sufficient boost pressure.

Check the intake manifold and exhaust system for foreign objects, make sure the catalytic converter is functioning correctly, and verify that the throttle valve is fully open.

A lack of fuel supply is also a possibility (a potential additional issue). However, without any other problems, the engine would not produce soot at full throttle. And the low mass airflow (MAF) values are not related to this.

Best regards, Rainer.

The previous owner installed a DPF (Diesel Particulate Filter). Could this be related to the issue somehow?

The throttle valve is located directly on the EGR system and is controlled by vacuum, correct? If so, I disassembled and cleaned it today.

Biggi wrote:

The previous owner retrofitted a DPF, could it be related to that in some way?

A blocked DPF (Diesel Particulate Filter) could be a possibility - check it.

I'll take down the und KAT systems tomorrow and then go for another test drive.

But even if it had too much back pressure, wouldn't it still have been possible to gain power by chipping the engine?

Hi,
Here's something else that's strange about the air mass.
You are showing data from two Lupos with significantly different values for the actual air mass, as can be seen in the images at the beginning and in the two logs from Block 10.
The engine with the higher actual LM values is running worse. Conversely, I would have expected the opposite. Just to be sure, did you perhaps misinterpret something?
Please record some data at full load using sensors MWB 1, 3, 8, and 11. The data from sensor 3 will allow us to establish a direct relationship between EM, LD, and LM.
Since you have a reference vehicle, please also provide the comparative measurements for it.
hg
Herbert.

Here is the CSV data from today, without a DPF, so it goes directly from the catalytic converter to the environment . Is there any change visible?