Ecu tuning 2002/2003 g35sedan (very technical)
I think staring at hex for too long makes you hallucinate 
It looks to me like a bunch of the "tables" that the ECU uses might be stored pretty early on, there's some interesting patterns around the 37XX offset area where there's runs of values that contentiously get larger, but not by a fixed amount, and things like that.
I think it would help if we had a program that would let you graph the raw data given a certain offset range/#rows/#cols/bits-per-byte/etc... in a 3d type chart.
Just seems like being able to get a more visual look at the data might make it easier to find some of the tables
It looks to me like a bunch of the "tables" that the ECU uses might be stored pretty early on, there's some interesting patterns around the 37XX offset area where there's runs of values that contentiously get larger, but not by a fixed amount, and things like that.
I think it would help if we had a program that would let you graph the raw data given a certain offset range/#rows/#cols/bits-per-byte/etc... in a 3d type chart.
Just seems like being able to get a more visual look at the data might make it easier to find some of the tables
Haltech? That's so expensive though...
Judging by the other ECU's, most of the power modifications are actually done in the later part of the ROM image (like 0x60000 area). I may be able to narrow down the areas I think it would be at by looking at some other ECU's. Most of these ECU's use the same or similar CPU's, they just use their own brand-specific encryption I guess.
Judging by the other ECU's, most of the power modifications are actually done in the later part of the ROM image (like 0x60000 area). I may be able to narrow down the areas I think it would be at by looking at some other ECU's. Most of these ECU's use the same or similar CPU's, they just use their own brand-specific encryption I guess.
Man, it would be really nice if we could get a hex dump off of several different cars, or ideally the same car before and after a tune!
Anyone know what software/hardware is involved in dumping the ECU? My cousin is thinking about getting an osiris tune, and if I could get the hardware/software, I'd love to do a before/after dump of his car, as well as a dump of a factory 04 G35 Sedan AT that I have.
Getting all those files to compare would probably make things a lot easier.
Anyone know what software/hardware is involved in dumping the ECU? My cousin is thinking about getting an osiris tune, and if I could get the hardware/software, I'd love to do a before/after dump of his car, as well as a dump of a factory 04 G35 Sedan AT that I have.
Getting all those files to compare would probably make things a lot easier.
That would definitely make it much easier to get a before and after image of the ECU. I know you can dump the ECU with Osirus:
http://www.treadstoneperformance.com...install-76.pdf
Might be hard to get ahold of the required hardware/software if you're not an Osirus tuner though.
Another way to do it is explained pretty well in this link:
http://www.nissanclub.com/forums/ecm...ogramming.html
I know for our cars there's a cable called the blaZt for OBDII which we can use to hook up to the OBDII port. Then you might be able to use ECUFlash, ECUexplorer, or some other program to dump the image.
http://www.treadstoneperformance.com...install-76.pdf
Might be hard to get ahold of the required hardware/software if you're not an Osirus tuner though.
Another way to do it is explained pretty well in this link:
http://www.nissanclub.com/forums/ecm...ogramming.html
I know for our cars there's a cable called the blaZt for OBDII which we can use to hook up to the OBDII port. Then you might be able to use ECUFlash, ECUexplorer, or some other program to dump the image.
Last edited by ryanm8; Jun 11, 2011 at 03:08 PM.
^Yep. I just browsed around and noticed that.
They say in their FAQ that the NSDII software won't flash anything to the ECU, but IDK if it will do a rom dump or not. Couldn't find that info anywhere on their site, so I sent them an email.
They say in their FAQ that the NSDII software won't flash anything to the ECU, but IDK if it will do a rom dump or not. Couldn't find that info anywhere on their site, so I sent them an email.
Looks like you might be able to download ROMS from here: http://www.nissan-techinfo.com/J2534.aspx Click the reprogram tab.
I have a stock '04.5 ROM image along with fuel/timing maps in hex if it would help. Maybe you can cross reference some fuel maps and reverse engineer where they are in the ROM, ect ect. I really doubt it's encrypted but I could be wrong.