Guys I have read around and noticed that some people seem to think that the TH ecu could possibly be remapped. Now I have a EPROM (erasable/programable ROM) R/W/RW unit and if someone was to send me a TH ecu, working or not, i would be able to upload the rom file from it and possibly start work on some software to edit the mapping and other variables.

From there just a daughter board is needed and a completely tuneable ECU could be had for littled over the cost of a eprom chip and a daugter board, and pre tunned chips could be sold to increase rev limiters, speed cut, and a basic more power tune.

If someone does have the TH (or any other for that matter) ECU and doesnt mind parting with it for a few months then i can have a real go at it.

This exact proceedure is done (by me on countless occasions) on any NICS Nissan ecu, commonly R32's and Z32's but any can be done.

Interesting stuff.... :)

Ask Jasons VRX as he has a reprogrammed TH ecu in his car.

Interesting, so its possible. Need to get myself a TH ecu to play around with then.

can it be done on older magnas, aka 2nd gens?

depends on the type of ecu or more specificaly if the rom chip for the ecu is a standard eprom.

depends on the type of ecu or more specificaly if the rom chip for the ecu is a standard eprom.

To access the TH ECU parameters for a ECU reflash, you need the factory mitsubishi access security codes removed (I had a bloke in R&D at MMAL do mine back in 2001) and by doing this the imobiliser system will become inoperative but it then allows access to the fuel and ignition maps (it may seem silly but thats the way it works).

The reason this doesnt get done by many is because no one outside of MMC japan has been able to remove these codes until late 1999. The reason the TH was and is the only model done was it was the series model used during the protoypes of the early early ralliart engine trials and with the TJ model the computer codes were changed once again to stop tampering outside of MMC.

All pilot build ralliarts ran TH (reflashable) ECU's and once the final sign off of the production mapping was done, production ECU's were retrofitted to the pilot build cars and all ralliarts built after that.

PM me for more details if ya want or chat to me on MSN.

So, Jason, it's possible to re-map even a TJ ECU, but you first need to circumvent the security?

I received my donor TJ ECU and BEM modules last week actually, but I'm having a hell of a time trying to determine the microprocessor used, what is worse is the board is a 2 layer design, similar to a computer motherboard (which tend to have 4 layers). This makes it utterly difficult (more like impossible) to solder/unsolder components on the board without precision tools.

The ECU is a Bosch product, so I assume Bosch were the ones who designed and engineered the boards for MMAL. I've been cross-checking part numbers on each chip on the Internet, and still no luck. Actually it looks like the part numbers have been removed from the etch and replaced by Mitsubishi part numbers to make things even more difficult.

For those hoping that the microprocessor was a 68HCxx chip, well it definitely isn't. A total of 256-pins, i'll try and get pics online and see if there are any other electronics guru's online who might be able to help.

For now, without knowing what microprocessor type it is, it will be extremely difficult to reverse engineer it. I might have better luck with the memory chips, but if they are encrypted, this may just end up going no where.

So, Jason, it's possible to re-map even a TJ ECU, but you first need to circumvent the security?

I couldnt honestly tell you as ive only know of TH units being used and when mine was cracked i was told only "TH" units could be done, mine was done by a R&D guy that used to race a EVO7 lancer in the GTP class (sum guys on here will know him).

I wont name the bloke as it took alot of arm twisting to get him to do mine for me. :D

its not the processor chip which is the problem, its the rom chip which holds the data which needs to be replaced.

you need a soldering station, its a soldering iron with a little vacuum so it sucks away the solder so it cant dry when you go to the next pin. then just chuck in a daughter board so you can remove and install chips at will