[Camar0wn3d]

Originally Posted by Blueclyde

wh0rsep0wer:

I'm pretty amazed at the level of access you seem to have to automotive ECM calibration tables. I'm shocked the OEM's give out encryption keys to aftermarket software companies for this type of access. There must be some waivers signed for that. Do you actually have write access to those tables? If so it seems like an easy way to jack up an emissions calibration and subsequent catalyst life. I know most folks here have no concern about that but I could see a lot of so called "experts" out there with this type of tool really jacking things up.

So I can see from what you have shown, at least on the 2002 Z28, there are two cal tables. I guess my point revolves around the strategy code. I understand how you say it works in the presence of knock but why doesn't it revert after a key cycle? It would be really good to hear from somebody "in the know" from GM on this. No offense meant to you at all on this. You seem to know your stuff. Great info.

Thanks...yes, with HPTuners you have write access to just about everything, including those tables. For example, the first step in creating a speed density tune is to copy the high octane tables into the low octane tables (which is why I was familiar with the concept of why the fuse pull works)...so it gets rid of your safety net....and you BETTER not put low octane fuel afterwards.

You are also correct about the ability to "jack" things up...it is extremely easy to blow up your motor changing parameters this easily...THAT is why dealers have a good case for voiding warranties based on ECM flashes. This should ONLY be attempted by professionals. In my case, I'm not a professional tuner but I work with instrumentation and control systems in the nuclear industry. More importantly I know just enough about it to know how easy it is to screw stuff up, so I'm EXTREMELY cautious with my tuning.

It is entirely possible that the tables are supposed to revert after a key cycle...it makes complete sense to do it that way. I'm also curious to find out the true prognosis on why some of these ECU's aren't reverting...