I currently have lt1 edit for my personal tuning program. Well recently took it and had it dynotuned, they used Tuner Cats. So my current tune is a tuner cats file and I want to change converter lock up and shift points. Can I read the pcm with lt1 edit, make my changes and re-program it and still keep the tune the same? I know Tuner cats has alot more tables then lt1 edit does for tuning, just want to make sure it wont mess them up. Thanks

 

Your basic premise is inaccurate. Your current tune is a binary file inside your PCM. You can download it from the PCM using LT1Edit, modify it, and upload it using LT1Edit. You cannot edit the Tunercat file itself unless you have a file conversion application, but I am not sure why you would want to take that path.

 

i would try to remove the formatting like i said in your other post, as both files are .bin files at some point.. i know i removed formatting on bin files that where changed into zip files and it worked..it seemed that the zip files that i removed the formatting on were actually lt1edit files that were zipped and i was using tunerpro rt v5 to look at them.

after thinking about it, all you have to do is download the tunercat program from your pcm with lt1-edit,save it, modify it,then reupload to pcm with lt1-edit..

 

brucer, your last paragraph is what I attempted to explain, in different words. Once you download it from the PCM using LT1Edit, it becomes an LT1Edit file because LT1Edit formats it in a manner it understands.
While it could be possible to strip off the header and footer of the actual Tunercat binary file, you stand the chance of removing things like the checksum, the file length, etc. This information is contained in the header and footer of every binary file, but is transparent to the end user.

 

Meen95z:
The PCM doesn't store data the way a hard drive does. Your tuner didn't actually load a TunerCATS file into it. Your tuner used TunerCATS to send values to the PCM similar to the way you sent keyboard keystrokes on the internet to post your question on this forum. When you read the PCM with LT1Edit, it retrieves all those PCM values and saves them on your computer in a file that LT1Edit can understand. When you load the LT1Edit file to the car's PCM after making your changes, it sends all the values back. All the values you've changed and all the ones you didn't change.

 

alright, just didnt wanna lose my dyno tune file by using lt1 edit to change shift points and converter lockup. Long as my current file (tuned with tuner cats) is gonna be the same after I use lt1 edit, im alright..

 

None of this exists. The only difference in the files is the top and bottom halves are swapped.

 

Interesting. I wonder how they verify data integrity without a checksum attached.

 

There are checksums, but they are part of the GM data format, not, as you were suggesting, something that TC or LT1edit adds.

The two halves are simply data dumps from the two ROM chips (note the file size).

For S&G I just changed a byte in a BIN file and loaded it in TC and it did not complain.

IIRC TC does verify the checksum when downloading from the PCM.

 

I use them interchangeably. Not sure what the big deal is.

 

i was wandering the same thing.. i downloaded the stock .bin in my pcm with winflash...

opened the .bin with tunercats and checked the vin number, i can open the same .bin with tunerpro rt

do the changes only show up when you edit with tunercats and resave with tunercats? and same thing for tunerpro rt?

 

Interesting. I did not suggest anything, merely commented that checksums are a basic form of verifying data integrity. If the halves are switched, the checksums will be different. I thought I saw an app that would allow Tunercat to read LT1Edit files, but I don't remember the reverse.

 

think that program is called tune conversion.

 

No.


It's called tunercat.


tuneconv