Td5 D2 engine - MAP test (1)

Eager to use the Nanocom with it's on board SD Card to record diagnostic info whilst driving around.

Trying to 'read' and comprehend all the multiple data points of what the engine is doing whilst driving around is not to be recommended. In the past I have only used the Nanocom while stationary.

Since I have begun to study and adjust the engine management, I feel that having a printable record of all the existing data points before making any adjustments to them is advisable at the start so that any adjustments can easily be quantified and recorded for later comparisons. It may also be advisable to establish the same 'test route' to drive along when data logging...

Here goes nothing. 

23/03/17  -  Loaded a 8gb SD card into the Nanocom and connected to the OBD socket on Hx. The Nanocom SD function is not a 'hot' connection so it's important to insert the card (and retract it) while the unit is not powered up.

Once powered up the live data logging can be started by pressing the SD Card symbol. A text box opens up showing the files on the SD Card and prompting the user to select a file or create a new one. I plan to create a new file every time I do a test run, so I started by naming it  'T1'. 

Once created the file is opened automatically and a text message appears saying 'recording session started'. The Nanocom is now recording whatever set of data that was selected earlier.

Initially I selected the 'Inputs Fueling' data and was concerned that it would only record data that was on the actual screen I was viewing. There are four pages or 'screens' of fueling data on the Nanocom and it appears that every available parameter is recorded to the card.

It is possible to cycle through the available data screens whilst recording but I would hesitate to move to a different set of Inputs/ECU in case issues of the 'plug and play' nature crop up.

Have to admit it was a buzz to just drive away and know that all the data was being recorded.

I took Hx for a short run of stop-start traffic but also fast open road. I am still getting used to the improved response that the new MAF sensor has brought and was surprised how easily Hx now gets up to speed and is just a lot more driveable. Brought a smile to my face !

The data logging can be stopped at any time by pressing the SD card symbol and a text box appears saying 'data recording stopped /suspended'. I believe if started again it would resume writing to the same file?. 

I read online the it is important to switch off the unit fully before unplugging the OBD lead. This does not need to be done when no SD card is inserted. So once at the destination, I halted the recording then just closed down the Nanocom. There was no text box saying the data was saved or suchlike.

I did the same procedure on the return journey. When I selected the SD symbol I could see that the file 'T1' was on the card so I just created a new one 'T2' and drove on..

Back home it was time to see what was in the files. I connected to the laptop via the USB port. The Nanocom when fitted with a SD Card just behaves like an external card reader. It appeared to download some drivers to the laptop and then it was easy enough to locate the files and read them on the laptop.

The files straight out of the Nanocom are formatted in 'Word Excel' as a .csv file. Personally I don't have 'Word' but use 'Open Office ' instead. This program was able to open the files and offer some formatting as well.  I made copies of the files to the laptop to study and mess around with.

I read that the data range is written to the card roughly every second or so. A lot of info is generated. Even so, a lot can happen during one second. There is much info to be sifted through. Number crunching to say the least..

I had planned to upload it here but it just wouldn't be feasible.  After studying it, I should be able to extract comparable excerpts and present them here.