rotarenvy

what do the hysteresis maps look like?

vansickey

The stock ones look the same.

vansickey

It's been dead for a bit...
I speculate that I have found the Throttle position map in the cal 03 mt rom, I haven't actually tested it yet, but it's 21x18 16 bit it starts @ 73A00, 3 different ones in that area, not sure why yet. I have 3 in my rom that are identical to yours. A little testing would verify it's TP.
I went back and rechecked my idle timing table against n3z2et @ 6DB14 and it alters my fueling, not my timing( but they do look like a matching leading and trailing table)... and I can't find a matching table like 6E048, which I was thinking might be the idle timing.
Other than that, any thought on the SDAIS system? I have some addresses, but can only really verify the 6th port and the VDI.
Another table of interest to me was a Tip-in fuel enrichment... I don't have anything on this yet.

myriadshalaks

iTrader: (1)

you can tune on your own with accessport using racetuner. i really don't see how efidude or scanalyzer would be better than that for the do it yourselfer. and coob always gives you mazdas latest flash with purchase of AP. you can see the whole map.

i'm not sure if i'm following this thread right, but if you guys want to know what the stock map is supposed to look like, i can show you.

auzoom

We had this discussion on Cobb Forums. Because there is more to the world than just USDM.

Cheers

Andrew

madcows

Hey guys!

First of all, I'd like to comment on all the hard work some of you have put forth into this project - especially seik! I read through the "cracking the ecu" thread, and some of it really reminded me of the work going on in the EvoX/ralliart community (down to the processor - which is of a similar family).

While it looks like now a major portion of the maps are extracted, I was wondering if I might be of any service.. I'm pretty much useless i software reverse engineering, but if it hasn't been done, and someone could take some detailed pics of the traces on the ECU circuit board, I could at least potentially help determine which sensors/devices attach to which ports on the processor. Is that unnecessary by this stage?

seikx8

Man, I just wish I have more time to spend on this project. Just want to drop by with no update still. However my turbo fabrication is about 90% complete and I work 10+ hrs a day now, so you can guess why I haven't frequent this board for a while.

I think I've seen this before when I traced the code and I was wondering the same. Maybe Mazda change these value to match the engine power curve with new fuel/timing values. And if i recalled correctly, there is a low-high and high-low opening scheme preventing the valve from flip-flop; or is it something else that I was working on .

Brettus

iTrader: (2)

Could be 3000 - but the effect of it is felt a few hundred rpm later - hence the discrepency

otakurx

Hey, is there still interest here? I've been in contact with Colby at OpenECU as well as a few others that are looking to add RX-8 support. I've also been doing my own work with this and have a few ROM's from different years including a RB tuned ROM image.

TeamRX8

iTrader: (25)

Good to see you back

yes

how are you getting your ROMs?

otakurx

Well, I was playing around with the lower level protocols for a while but then decided to pick up a Harrison R&D unit since I wanted to focus more on the ROM itself then the process of reading and writing (since that seems to be handled pretty well at this point). The ROM's I have are pulled from people I know around here. I got the latest U flash straight from the Mazda MMP utility though and the RB flash was sent to me.

I will admit I've been busy with work and doing an engine swap (lost a coolant seal on rotor 2 at 153,792miles) so my work with the ROMs isn't as far as I'd like and it hasn't helped that I've more then once got caught up looking at the raw assembly code as I try to understand the actual Hitachi Vehicle OS. But with all that in mind I've been able to put a working flash on my car to clear DTCs and adjust my fan temps. Was nice since I hadn't looked at my work with the ROMs for almost 2months while I practically lived in the garage with the 8 (figured I'd get a lot done while she was apart).

I do know that Colby (the mind behind ECUflash) is working on adding the RX-8 to his list of supported vehicles. I helped him get a head start by giving him all my notes on the PCM's hardware spec for the S1's as well as the code base that Mazda uses for it's ROMs.

arghx7

ECUflash + the ability to turn off CEL's and force readiness would be pretty important. It would help with inspections for those people who are running speed density based systems that keep the factory PCM on life support. It's a lot cheaper to use a ECUflash and a Tactric cable than to buy a whole AP just for something like that.

otakurx

Exactly my thought. I haven't figured out how to force readiness but I have it so it doesn't care if certain systems are present or not.

TeamRX8

iTrader: (25)

After being burned on the Harrison CanScan I'm reluctant to try him again

In general my experience with every supplier on this subject has been less than positive in various degrees

otakurx

ya I was worried about being burned with the Harrison but my experience wasn't that bad dealing with them and the product works fine so far. Does what I want at least. I know I could have spent a lil more and gotten an AP but some sick and twisted part of me finds enjoyment out of reverse engineering things. I agree with Team on one thing tho, the product may read and flash but that's really all you get from Harrison, and most others are tight lipped or just don't care to help out with understanding the ROMs.

You most definitely can get the feeling that all the places either feel like your not worth talking to or that you should be seeking their professional services to accomplish the task. Then you have the manufacturers who want all the inner workings to only be accessible by there private techs at dealerships and other corporate facilities leaving the small shops in the dust. The old idea of working on the car at home as a father/son project or just because you enjoy working on cars in general is dying with the new age of automobiles. Some say it's for emissions or safety or this or that but I think it's been shown here (I believe I've seen MM back this up many times) that you can tune and have fun with a car and even build monsters that pass smog and retain safety. Just sucks now cuz you basically need a degree in software engineering just to figure out what's going on in the damn thing. But I digress.

Anyway, if there is interest in the little bit I had done already and what I'm still working on (slowly due to a bunch of training I'm currently in for work but still working on), I'd be more then willing to put up all my data on my website and if others are interested in putting in some time I'll even setup a content management system off my servers so that files and related info can be easily exchanged and all.

Disclaimer: I'm not a master tuner, I've gained an understanding of tuning from prior experience plus lots of reading and I'm better with carbs then with EFI. But I am a software and systems engineer and working with the raw ROM's is right up my alley and I may try to find an algorithm that would allow for a semi-automated discovery of datasets in the ROM's but for now I'm still trying to figure out similarities that exist between revisions of the ROMs and the larger maps are cake when compared to finding things lik fan temps or idle speed and so on.

TeamRX8

iTrader: (25)

Well I'd think figuring out the major known maps would be easy with a Cobb unit if you have the ROM capability too. Make changes to a particular map with the Cobb, load it, then check the ROM to see what changed where.

otakurx

That would make things a breeze and I could use that to make a tool that could scan the hex code and attempt to find and label maps based on known values and so on. Issue is I don't know anyone up here with a Cobb for an RX-8. I mean just knowing a few layouts of Cobb supported ROMs could make it quite a bit easier to take an unknown ROM and map it out since you can look for axises and common values in a table since not every value changes. That's how I've been doing it so far but all by hand. I have noticed that it seems certain calibrations have different map sets tho. So that gets a little confusing when you have a calibration with an extra fueling map for a pre-defined set of gears that doesn't exist in another ROM.

otakurx

Well now, with the knowledge that Cobb is pulling out perhaps this side project got a little more important.

TeamRX8

iTrader: (25)

Sent you a PM

vansickey

I haven't done much more with this project since last I emailed you. I think I just added DTC descriptions. I had considered working on more defs but I am limited to the roms that I have. With one pretty well mapped out, others should be progressively easier, but I too don't have an AP, which would have made things a lightyear faster. Hadn't you been looking into powersteering control? Anyway what sort of progress can you share?

otakurx

Well I've located most the fuel and timing maps in the U calibration from Mazda but I'm still working on everything else. I tried a couple automated utilities with little to no luck so I've been doing it all by hand using compare functions in a Hex editor as well as the demo version of WinOLS. Slow process since I don't have huge amounts of time to dedicate to it and like I said earlier, through May and June I was tied up swapping out my engine and chasing down a few gremlins in the car (bah I knew I shouldn't have fed them after mid-night) and prior to that I was trying to figure out why she was running crappy lol (I was in denial about my disappearing coolant right up to the moment she spewed it all out on the ground while I was 2hrs from home).

arghx7

^ Are you using IDA Pro for disassembly?

otakurx

I wish, no I'm using some free windows and linux utilities including a dis-assembler I found that works with SH-2 binaries.

arghx7

Have you never heard of BitTorrent?

otakurx

LOL yea, just didn't find any good torrents on the couple sites I looked at. Then I became distracted as I dug my heals in with the utilities I already had.