Jarvo90
Hi,

I work in many different race series and have overheard comments from some people in the pit lane that the time it takes to offload data is quite long.

However I have also heard that recently there have been improvements in this area and it is actually pretty quick so offloading data during pit stops in no problem at all.

Are you able to comment on this and give some estimated file sizes and offload times?
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AlastairF
Hi,
The offload time is of course dependent on the logging rates used and the length of the stint you are offloading.

As an example if we imagine a typical car with a comprehensive ECU CAN stream, an IPS Power system CAN stream and maybe 6 or so analogue sensors, thats been out on track for 30 minutes - then we should be able to offload the 30MB dataset in around 10-15 seconds.

Helpfully Pi Toolset has an automatic offload feature, and allows pre-configuration of the comments, driver name, track name etc. The storage path and file name can be automated too which makes the housekeeping task of organising datasets much easier.
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Gummi
Just to add to this, Toolset has a diagnostic tool for the connection to the car. In the Device tab there is a "Test Connection" function. This allows you to check if there is an issue with wiring or any packet losses. If you experience slow download speeds it is worth doing this test. 
Ethernet wiring is fairly sensitive so CAT5 ethernet cables should be used all the way through and you must take care with getting the pins right. Many network cards will cope with pin swaps and bad wiring, but it will slow things down.

a good startingpoint on wiring for an ICD can be found here on the forum:
http://support.cosworth.com/post/wiring-your-ips32-ips48-to-your-icd-ethernet-hub-7368490?pid=1286844125#post1286844125

If you have different devices then the specification sheet will have the pinouts. 
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troberts
Also, if you require quick pitstops with large amount of data in the downloads, it may be worth considering using a card logger. These are particularly prevalent in endurance racing where you only have a driver change to get the data from the car.

Cosworth Support
Cosworth Electronics 

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Jarvo90
Thanks for all the comments and feedback, much appreciated.

Just something else regarding offloading during pitstops....If I begin downloading but we then have to send the car back out mid way through, what will happen when I simply pull the download cable out of the car?

Will it corrupt the data file on the laptop and / or on the device? Or will I get a partially offloaded file that is usable and contains data up to the point I break the connection with the car?
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Gummi
The data will still be ok on the car. It is possible that you could end up with a partial dataset on the PC, but highly unlikely. Normally you end up with an incomplete file that is not readable. It all depends on how far along the download process you have made it. The last part of the process is to complete the file, but the verification that download has completed also takes time. 
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