expanding tuning capabilities?

[ericjon262]

There's also $12P for the 7165 ECM (99% plug'n'play for a Fiero harness BTW), and that has VE and spark tables to 9600 rpm I think.

Then there's code59 as well but I can't remember how high the VE tables go.

plug and play is a non issue in my case, as there's nothing left of the Fiero harness ECM wise.

I'm gonna give obd2 a shot and see what happens.

[roughneck427]

Did you ever think maybe to use a holden 1227808 ecm?? obviously have to rewire your harness but offers real time tuning and some cars cam stock with a 5 speed

http://delcohacking.net/forums/

[ericjon262]

right now, I'm not entertaining OBD1 ideas until I get fed up with fighting OBD2.

from what I understand, the 808 is very similar to the 165 mentioned earlier.

[ericjon262]

ok, so would it be safe to say, that if I were to undertake a task like reprogramming parts of a PCM, it'd be best to work with OBD2 and stick to it versus learning how on OBD1 and then trying to apply it to OBD2?

[robertisaar]

depends. work done with anything wouldn't necessarily be lost when transitioning to another format. while you wouldn't be able to import 6811 assembly into a 68332 program(or at least, no way i know of), you could use the existing code as a guideline for new code.

example being the spark cut rev limiter i've been spending too much time dragging ass on... there's a lot of ways that one could go about it, but it does seem like the best way to do so would be to just remove the time that would normally be used for dwell and just have the ICM go about it's business without actually triggering the coils. if you can find the hardware addresses that the 68332 uses for dwell control, you could employ essentially the same operation that works with the 6811.

[ericjon262]

gotcha.

When you got started into coding, where did you start? did you go to school and study it, or pick it up on the side?

[robertisaar]

ha, no formal education with programming..... though it wouldn't be a bad thing to learn.

i just took a look at what GM did, what other guys that were writing custom code did and went from there learning what did and didn't work.

[ericjon262]

alright! now that I have a Legit disassembler I can start learning WTF I'm doing... LOL crash coarse in programming anyone?

[ericjon262]

haven't had a chance to dig deep into it yet, but his thread sounds like a nice read on the subject:

http://www.thirdgen.org/techboard/diy-prom/507563-pcm-hacking-101-step.html

I know dimented24x7 had lots of informative legit posts back when I frequented TGO.

[robertisaar]

if there is any one person who is willing to spill info to the DIY crowd about anything GM OBD2, he is undoubtably the guy to talk to.

[ericjon262]

maybe once I read the thread in it's entirety, I'll start my own thread over there with questions and see what we can come up with.

I plan to post any info I find that might help the next person who comes along, so that hopefully they will pick it up and continue where I leave off.

[TGP37]

You COULD find some visual binary editor where you can see the overall patterns of the bin file. At which point it is easy to see the different tables in a graphical kind-a way (all data is in the end of the file, OS is in the front). I know the software is out there, but I can't find it let alone remember the name of it.

From there, TT will let you add tables to edit as long as you can edit the microsoft database file. You just need to know where they are at. Plus a few other bits of detail.

Then comes figuring out what tables they are. Identifying a spark map is easy, finding an on/off variable is harder.

BUT, having a table with the start address you may be able to figure out how to search the code and see what is referencing that table.



I disassembled a bin file, after figuring out the entry point, the analysis was just mind bogglingly complex. I'd rather try to figure out women then decode that file!


You could also find a bin file with settings you are looking for (ie- dual fueling) against one that does not. Make every table you do have equal and then use a binary compare to find differences (past the OS section). Investigate those locations. Doesn't always work though.

[roughneck427]

Win OLS

http://www.evc.de/en/product/ols/software/

[ericjon262]

ok, I'd kinda stepped away from this for a while...

so, here's the question:

if I know the address of a table in the code, can the increments just be adjusted to better suite my needs? ex: instead of RPM rising by 100's, go up by 200's.


To me, that sounds to easy, but I figured it wouldn't hurt to ask the pros!

[34blazer]

I took a hiatus myself. Upgrade training, studying the PDG, sq SME, now instructor training!

Here's some links to stuff I was studying...

http://computer.howstuffworks.com/bytes4.htm

http://electronics.howstuffworks.com/digital-electronics5.htm

http://carprogrammer.com/Z28/PCM/disassembly/Intro%20to%2068HC11%20Programming.htm

When I left off earlier this year I was at the point where I could sorta understand certain parts of the code, but had no idea where to implement it. Its a PITA when you don't know exactly where to start, I was hoping to see one of the resident programmers build a small tutorial on how to add a patch or something. A good tool to invest in is a test bench, build one with the help of the pros so you can experiment with code without worrying about blowing up your car. Im hoping to build one in the near future, but looks like ill get PCS'd within the year so Im already starting to pack up some non-essential crap in the garage lol. Good Luck!