Hamza734

You should read the criticism more closely... no one is discouraging Jinx, just pointing out the fact that the work needed to reprogram the ECU *MAY* not yield worthwhile gains. Also, no stock ECU can be tuned "JUST LIKE A HALTECH"...it's simply not possible.

imloggedin

you get a haltech TUNED.. you would get this TUNED, its a comparison with the word TUNE.. im not saying its a haltech.. people were acting like the person who owns the car would tune it.. so its a bad idea, im saying you get it TUNED LIKE A HALTECH.. get it? and yes they are discouraging.. how is "its not worth your time" encouraging???

rxspeed87

don't know how much similar the ECU on a camaro/firebird would be but even though there cars are made in like 85-86 time frame ppl still take those things to have them reprogrammed

the gains have been very good as well

so you might not be ablet to do everything as well as a haltech does it but then again are you spending 1000 either?

to me the cost of FREE for a small lack of function vs paying 1000 for a little more makes the whole reprogramming a worthwhile solution for right now

keep up the good work guys

wish I could help but don't know much about what I can do since I do not know much

theloudroom

Actually, yes it can.

By changing the ROM values, you can tune fuel maps, ignition maps, etc. You can accomplish this tuning in realtime using a "romulator". (A romulator for the EPROM chips used in the ECU is already availible.)

Please butt out. You've already made your viewpoint abundantly clear. If you don't want to reprogram your ECU, don't.

The fact is that there is no technical reason why the stock ECU can't be tuned for different fuel maps, ignition timings, etc.

Maybe it won't spray 2F2F graphics all over your laptop or control your naws system, but it's just plain ignorant to say it can't run the engine properly.

derek1987

Does the RX7 Ecu run a 8-bit processor and the Haltech has a 16-bit processor? Now people earlier in this thread acted like the Rx7 Ecu was "TO SLOW" or "out of date". I am pretty sure that you do not need a supercomputer to run a engine. And also running the Stock ECU would probably be better becuase Mazda spend the money to make it run right and work with the engine. Would this be right?

derek1987

DB

imloggedin

are you still working on this jinx?

RETed

You are correct.  Most ECU's are using the Motorola 68HC11 or a variant of it.  The original 6811's clock-speed was around 10MHz, which would sound slow compared to your current Intel powered PC (>3.0GHz), but these microprocessors run a very slim RISC design.  With the reduced language set and streamlined run processing, the 10MHz clock-speed is fast enough to handle engines revving up to 10k RPM with very little fuss.  On top of that, these automobile uP's typically run a timing co-processor, which handles the ignition input duties; this lessens the responsibility of the main processor demands, making for a nicer running system.

The CPU chip isn't very quick, but it's "good enough" to handle running the engine.

NOW, it's a matter of what programming you're doing...  Sometimes, just "changing the maps" doesn't always work, as there are lots of watchdog and range limitations coded in there typically.  This means if you adjust something that the code doesn't like, it's either going to barf or revert back to a "backup map".  Thus, "ROM tuning" does NOT change parameters in very extreme values.&nbsp Fuel maps are typically not adjusted past 20%, and ignition timing isn't adjusted past 5-degrees either way.



-Ted

theloudroom

Wrong socket

Should have been:
A347-ND SOCKET 28PIN ZIF LO PROFILE

Off by one freakin digit with the p/n.

theloudroom

Anyone wanna offer up some webhosting for this project?

I'm starting to compile information (parts list, schematics, datasheets, etc) and I'd like to have somewhere to post it.

junior-coyote

Do you know what every chip in the ECU is? If so, you should be able to write a simulator (program on a PC) for the ECU and run the program in the rom on the simulator. It would also be useful for testing modifications to the original program. The next step would be a interconnection diagram of the parts of the ECU.

jinx22630

working on posting everything I have so far. The stupid forum that I set up for this project just isnt cutting it. It wont allow me to post any files. I'd like to go ahead and post the commented dasm that I have so far, so some other people could add to this as well. Anyone have any ideas on a better free forum that we could use? I have so much info that I need to get out to you guys, but I don't want to use rx7club.com for my own personal project. I don't think it would be fair to use their bandwidth.

RETed

You might want to talk to Henrick as he supposedly cracked the code already.  I've been wanting to take a peek at his work, but I get no responses so far.

I would love to see what you've done, if you're willing to share?

How much stuff do you have?
If it's reasonable, you can send email to me at reted_2000@yahoo.com



-Ted

jinx22630

Always willing to share dude. Thats what this is about. I've emailed Henrick with no response also. Maybe he wants to make some money from it. More power to him.
As soon as I can pull my hard drive from my trashed PC with everything on it, im going to try to post what I have so far, then maybe someone could host it or something. What I've done so far is dissasemble the assembly code, and comment out quit a bit of it. I was using IDA pro to do this, and it seemed to work ok, kinda quirky at times so there's a bit of guess work involved. I'd say to anyone interested in this, to go to the 16paws site and download the ROM dumps and start dissasembling and commenting. thats really where I am right now. What I'd really like, is to have a copy of an aftermarket chip so that I could do a side by side code camparison, just to speed things up. Any other Ideas please feel free to let me know.

BlackRx7

I have an aftermarket chip bought off ebay for 20 bux suppose to work with the n33x ecu's

jinx22630

Do you have a EPROM programmer? If so it would be very cool if you could post the rom image, along with a description of the changes that were supposed to have been made. thanks

theloudroom

Have you done a comparison of the different ROM #'s?


For instance my '86 GXL info is:
ECU part # is N326 18 881C
IC 605 is chip # 079753-0277
IC 604 is chip # 079753-0287

From the sixteen paws site I get this info:
FC331XG0156144 86 GXL Man? N326-18-881C (079700-1286) 079753-0275/0285

Same car, same ECU part #, different ROM #'s. This leads me to believe that they fixed a few things. Perhaps cars with a higher chip # don't have the flooding bug (or some other issue)?

What chip #'s are you working on with your disassembly?

I'm still waiting for my programmer, so I'm trying to trace the serial TX and RX lines from the CPU though to circuit board.

Also, I'm becoming more interested in converting to a MAF sensor. Have you done any research on this? It think it should be possible, it's just going to require some extra circuitry. What would be a good, CHEAP MAF to get? (maybe something I can pull of a truck in a junkyard) A Ford Lightning sensor costs more that I want to spend

theloudroom

I just found an interesting AFM to MAF conversion page:

http://www.carlton24v.co.uk/afmmaf.htm

theloudroom

Hey!

I just found a kit

http://www.splitsec.com/mafkits/universalkits.htm

stinger

i am not sure if this will help.
i bought a PROGRESS e.c.u. a couple of years ago and it has probably added around 75hp to the car!!
it has been entirely upgraded from what i can tell.
the person or maybe programmer (that created this program??) was FATBOY.
i have better timing, fuel ratios, boost/rev/speed settings, boost curve, and probably a bunch more that i don't know about.
i run a couple of other mods on the car and it seems to work just fine together.
the only thing it was not compatible with was an electronic boost controller. i removed it and the car ran better without it!
if there was a way you could copy it, safely, it would give you a good place to start.
or, maybe even a heads up on translating it.

imloggedin

id love to have a MAF conversion.

theloudroom

This is something I'm definately going to look at. It seems the kit I linked to goes for around $1000. Yikes.

I can get a MAF for my 3800 Buick for $70 at Autozone. It's not the biggest in the world, but I bet if I look more I can find one off a truck or whatever.

The big deal is going to be figuring out what the ECU can cope with.
A best case scenario would be that it's possible to just splice on the MAF and change the maps in the ROM. A more likely case would require a little soldering inside the ECU.

I won't know until I get schematics for the ECU done.

theloudroom

My EEPROM programmer finally came.

It looks like there a lot of empty space in those two eeproms and it also looks like the 16paws site's images are accurate.

jinx22630

Yep, I'm really leaning toward the MAF conversion as the first step in creating our little project. I used to work at Autothority Performance Engineering, and we had a conversion kit for 944 turbos, so i know how cheaply these things can be made. I've also got a friend in Ohio that's written a ROM editor package for Hondas and has had really good results in writing new code for a GM 3 bar map sensor. I prefer to have the MAF conversion ECU controlled as opposed to a piggyback. Just a matter of figuring out all the assembly code and what it does. I'm still in the process of trying to get my PC back up and running (Im on my laptop now), but I'm fearing that the hard drive is trashed, so that means all my hard work and headaches have been for naught. I mean I've spent so much time on this, and to think that it's all lost and I have to start again? FUUUUUUUCK!!!!!
Oh well that's just how **** goes sometimes.

1987RX7guy

iTrader: (3)

got BACK-UP?