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Found this interesting and thought I would share.....

Cut and pasted from Performance Trucks.com

Heads up to GM tuners
« on: February 21, 2008, 04:27:05 PM »
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I just had an email forwarded from a friend in GM Powertrain Engineering.

It was concerning an '06 Trailblazer SS. 6.0, with multiple engine/piston failure in Ca.
In investigating the failures, engineering started to look into the possibility of aftermarket/re-written calibrations, even though the cal id # shown in data was current.

After many repeated attempts by engineering to "decipher" the internals of the program, and months of begging and pleading from Powertrain on this and other "unexplainable" failures, the Delphi and GM (software) engineers finally decided to allow Powertrain engineering access to the actual software programming...
What that means is FOR THE FIRST TIME, GM Powertrain Engineering can look at actual parameters in each subsection of programming, and make side-by-side comparisons of "factory" vs "as programmed"....

Now, what does that mean?

Until TODAY GM Powertrain Engineering could not SEE every individual, specific change...bits and bytes...in every part of a program. They had no way to PROVE a calibration change...except for Cal ID#...and then, they could NOT deny major warranty work if challenged (court/attorney) or Arbitration Board.
It was impossible for GM to prove anything except for speculation...

BUT, with Delphi and GM's Computer Programming/software changes, they will have complete access to comparitive data.....

Because of this, they were able to PROVE this truck had changes to torque limits, spark retard/advance, fuel block counts, evap turned off, egr ramp profile changes, rpm limits raised, a/c command limits blocked, ect....and WON in front of an arbitration board.

This has already had fall-out inside GM. Apparently, winning this case PROVED to GM heirarchy that changes were needed in programming systems. Due to the # and frequency of failures concerning "suspect" programming changes...they have already started to develop a new system to debut in (supposedly) late '08 and '09 vehicles.

The new software will be encrypted differently, have "rolling" changes to encryption, and store values for only 10 software changes or updates...any and all CHANGES to the software will be stored seperately in memory...so comparisons can be made in case of a major component failure. After 10 changes, the ecm will "lock" and operate only on the original software cal. This feature is supposedly to prevent someone from "storing" and "re-loading" an original program. If you were to "rewrite" a program, it would store the original data, then the changed data, and then any re-writes of the original program.
All this would be retreivable by accessing the ALDL and requesting the changes to compare.

Also, he mentioned that, starting in mid May/June, ALL '07 and later vehicles returning for any warranty work that involve connecting to the factory TIS programming system will AUTOMATICALLY have ALL accessible computers/modules checked and verified for any needed updates.....SO, if you have a "hot" pcm recal, it will notify GM and Dealer personel of the "needed" changes....and possibly REQUIRE dealers to recalibrate any changed stuff.

And YES, its legal.
It falls under the Federal Emissions Laws. The factory can, at any time a vehicle is being serviced, check/verify/change ANY and ALL emissions devices it deems necessary, so long as those changes have been verified by the EPA. If it can make a change in tailpipe emissions, they are bound by law to make it work as produced.[/size]

Response from Butch at Westers tunes from the Denali site

Joined: 12 Nov 2004
Posts: 8716
Location: Middleton, MA

Posted: Sat Mar 08, 2008 7:02 am Post subject:

GM just at the end of last year, and after a long court battle, has finally let the aftermarket into their SPS database, the complete database, not the aftermarket version we had to use before! So now that they were forced to do that, they come out with this!!

PITA, but we'll somehow get the tuning done! Every year we have to change, and find new ways to defeat this craziness. A well written tune, by someone that knows what they are doing will add life to the engine and drivetrain, even the GM engineers are on board with that. Unfortunately we have to suffer for the majority of tuners that do more damage than good! I know one that hurt 7 transmissions last year, simply from lack of knowledge. Making a truck go fast but ruining the transmission or hurting an engine is not quality tuning. GM engineers have examined many of these aftermarket tunes. I have sent some of the bad tune files to Lyndon and he has shared them with his GM engineer friends. They have also examined dozens of Lyndons tunes and even shared information. The engineers know factory tuning is very limiting, they also know that it can be improved, but cannot do it themselves since the stock programming must cover all worst case scenarios like bad gas and poor maintenance.
Maybe it's time for licensing? It's been talked about! Eliminating the garbage tuners and licensing the good tuners would do allot toward the war between the manufactures and the aftermarket.
 

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I saw this on HPT's forum. It sucks, but what are you going to do. :shrug:
 

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Discussion Starter #3
yea i guess it was a matter of time.....
 

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sounds like im buying a nissan next. and il be buying an extra pcm to be tuned, lets see them catch that!
 

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The below kind of breaks your theory...
I think he is saying to swap the physical PCM. You know, keep the stock one stock and get a spare one that you tune.
 

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wow that really sucks. I guess if anything major happens I could always have it flashed back... Right?
 

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wow that really sucks. I guess if anything major happens I could always have it flashed back... Right?
looks like it will log that in the new pcm's. on yours that would be fine.
 

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walking is for the poor
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ok So they could not tell at all that my pcm has been tuned because its an 05 and this only applies to the newer pcms.
 

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Me thinks that somebody pissed off the wrong person with that
Nope, just Cafepress' standard regs they have in place to cover their own ass. They won't print something that's copyright protected, because then they could be sued. This was kind of taking it to the extreme, but they're still just protecting themselves. :shrug:
 

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Discussion Starter #19
well i guess it makes sense, but that is to the EXTREME
 

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I read a article years ago in Hot Rod about things like this. The article pretty much stated that in the near future modifying a car or truck will get harder and harder due to all the restaints the Gov is putting on the aftermarket. It went on to say that hot roddders would become the future outlaws, and that the proper authoritys, could impose fines on any vehicle that has been tampered with. Hell its just gonna be a matter of time before the only way you will be able to get the hood open is to have a dealer do it, that way you won't ever be able to do anything to your vehicle. It really sucks.
 
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