Does anyone have this software? There has got to be a way to get some adapter and software to reprogram the stock ecu without having to spend 600 bucks on it. Anyone ever heard of someone hacking the ecu?

 

Oh I can't wait to see how this tread ends up.

IByoufryyourECU
~Tom

 

What you are asking for does not exist. When you get your ECU "chipped", they actually put a little board in there with a socket for a new PROM chip. You can write a new PROM chip and swap it in, but I don't think the maps are editable without physically replacing the chip.

If you want programmability, get a PowerFC and an FC-Datalogit. Sorry, you've got to pay to play.

-Max

 

Theres gotta be some computer nerd out there that can do this..

 

Yep, he works for M2 and gets $600 bucks an hour!

 

If you wanna do you have to know how you write and produce micro chips. You get and e-prom burner, and hook that up to you computer and type out the hex code and load it on. IT JUST THAT EASY!!!!

good luck

~Luke

 

If you have the Mazda source code for the ECU, it wouldn't be a big deal.

Unfortunately, Mazda isn't likely to send it to you...

 

max is right, they dont actually reprogram the chip they piggy back it internally, its like an fcon or a pfs pmc box.
check out www.16paws.com he's taking apart an early fc ecu

mike

 

The other day I was surfing on japaness web sites.

and actually alot of companys sell ing eproms and writer and daughter boards.even famous tuners data..
and they were very cheap..

 

i agree with red rotor
there was a buy it now of $40 for a knight sports copied chip. the chip you plug into your stock ecu.
it probably did work, and would re-map your intake to run richer and produce more horsepower with simple bolt ons,
but, i was too afraid to put up $40 to something that i didnt really know what it was going to do.
am i the only one that saw this on ebay?

 

If the fuel maps are on a socket mounted PROM chip, then an EEPROM swap should be possible. The real problem would be if that chip also held values for everything else the ECU control (e.g. fans, EGR, turbo solenoids, etc.). You would be hard pressed to determine where and what each value was.

 

Do you have any links?

I've done a lot of programming on embedded systems. JONSKI is right - it'd be awfully difficult to figure out all the I/O for the entire system. Reverse-engineering is not imposible, but not easy.

If I could locate a spare or junk 5-speed ECU, maybe I'll take it apart and figure out which IC(s) are programmable. Power the IC on a breadboard and see exactly what it does. All the programmable devices should be pluggable off-the-shelf components.

Yeah, it would be awfully tough without source code. But I think it's clear that there are tuners who have done just this... reverse engineered the ECU (Pettit, M2, etc.). Which IC(s) do you change when you get a Pettit chip?

 

This is knowledge that should be shared....open source!!!! If someone has a stock ecu they want to donate here...maybe johnchabin can break the code. I wonder if mazda would give the code out.....they don't do any reprogramming do they? Maybe just wishful thinking, but that's how things change right?

 

The stock chips are not rewriteable. That is why you have to socket the main board in two places. The small (18 pin ) is boost and timing. The big ( 64 pin ) handles the fuel maps. The daughter board is used to carry the additional 18 pin e prom that acts as a gate for the Mazda 64 pin.

 

They may not be rewritable, but if they are socketed, there are so many programmable ICs on the market, certainly there should be one that fits the specifications for these chips. I'm not familiar with the Pettit or M2, but don't they just replace these stock chips with programmable ones? The manufacturer and part number of the Pettit or M2 could be gotten from someone who has this upgrade.

But it still comes down to figuring out what the stock programs (there are 2, right?) do...

RonKMiller is right. Someone already spent the time to figure this out and is making $100/hour doing it.

 

We went down this road before. We couldn't modify the Mazda code. 64 pin .075 chips are available and are only a couple of bucks each. It is just easier to do it this way (daughter board).

 

I believe I said $600 an hour.......... and I agree with whatever you said! (It's all Greek to me)I barely know how to find "My Computer"

 

Well, Bill B, how much do you know about the way the program functions? I'd be willing to give this a shot.

Even if we know the brand and model number of an IC that works, we could look up the specs on that IC. Figure out the pin-outs and even consider replacing the IC altogether with a plug/ribbon cable and cabling the I/O over to a high-speed programmable controller. Like a Z-World Rabbit (c-programmable to make it easy with a serial port for laptop connection).

 

EXACTLY what I was thinking... and I bet you could get LOTS of guys to pay $300 for it....(I'm a sales and marketing guy)

 

Ha ha! That's why it's not open source...

Once a guy goes through the brain-damage to figure it all out, he would probably say, "Aha! Now I can make some money with this!!!"

 

Bill B: You couldn't modify the code, or couldn't read the code because lock bits were enabled?

You probably could overwrite the program...

 

Not worth the effort to modify the code. That is why everyone uses a daughterboard.

 

It's not clear to me how the daughterboard is connected. Keep in mind I am not familiar with how the Pettit or M2 systems work.

Are the 18-pin and 64-pin ICs in sockets? It sound like they are soldered directly to the board and when modified, desoldered and replaced with sockets. I could see how these 2 new sockets could house new chips, but don't see where a daughterboard fits into the picture...

You don't know where there is a photo to help clarify, do you?

 

You have to socket them. If I get a chance I'll photograph the one I disassembled.

 

Ok I found a site this guys is not selling his stuff but he is showing some thing.
It's japaness

http://lillith.sk.tsukuba.ac.jp/~kashima/car/rx7.html

and I think it's for later FD.