Dumb tuning/file questions

[robvas]

Here's some random questions, there's probably a better place to ask them (or maybe where they are already explained), so feel free to point me in the right direction.

If I use an SCT device and use it to download my stock tune file, the resulting file is a little bit over 6 megabytes.

But, if a tuner sends me a file, that I then load on the SCT device, that file is only about 1 megabyte. I assume that it's just patching over my original tune, so it doesn't need to be the full file.

Also, if I use HPTuners to pull my stock tune, the file is only about 1/10th of the size of the 'stock tune file' from the SCT, 563 kilobytes. I am assuming that's because the .hpt files are more of a 'configuration' file and not a full 'tune'? Does that make sense?

I understand that there are things you can get from an aftermarket tuner like a custom operating system, so I realize there's more to a 'tune' than just a bunch of tables. Is there compression involved?

Can anyone shed some light on what's what?

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[Mach VII]

My stock file via HPTuners is 1308 kb and my update FRRP tune file is same. Has all info...

 

[engineermike]

I'm no expert on this, but my understanding is that all tune files contain all data tables and the C-code logic (the OS). However, each software has different storage formats, which could be .hpt, .bin, .tec, and so on. Each is more or less space-efficient than the others. When you reflash, there are options. For instance, the flash device might just replace the tables, but not the logic, which saves time. Also, PCMTec has a method of comparing by chunk and only flashing chunks that have changed, which gets flash times down under 20 seconds in some cases.

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