How to Hack the j32 MCU

[RPM SYSTEMS]

Moving all info into RPM 's Vendor Forum to make it easier to find .

[wolydotmatrix]

Interesting. This "hack" is for fuel and timing only? Is this a solder in chip? Plug and play?
Does it matter Auto or Manual? More details on what this will do, would give a better idea of what we're looking at. I see chips, resistors, leds and a serial port. Just trying to figure out .........."what is it" LOL. If it does allow us to alter fuel and timing via serial port with some simple software then $300- $500 would be vey doable. Just giving you a hard time Don.
We really appreciate your hard work and long hours.

Adam

[sho_tyme_racing]

Interesting. This "hack" is for fuel and timing only? Is this a solder in chip? Plug and play?
Does it matter Auto or Manual? More details on what this will do, would give a better idea of what we're looking at. I see chips, resistors, leds and a serial port. Just trying to figure out .........."what is it" LOL. If it does allow us to alter fuel and timing via serial port with some simple software then $300- $500 would be vey doable. Just giving you a hard time Don.
We really appreciate your hard work and long hours.

Adam

+1 This would be great kinda what I am scared to boost one with no hacks. If it could be close to like a EC tune setup would be great,2step,antilag,bbg option. Keep us posted.

[hondaboy4life]

Would like the know more details as well such as what kind of options this will allow us to control etc... I would say Adams price range is right around what i would pay as well. $300-$500.

[sho_tyme_racing]

UPDATES??????:confused:

[acidbath124]

awesome awesome awesome

[wolydotmatrix]

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Hope this helps you out Don

Adam


Looking at their site I found this to be the closest to what your looking for

128 pin Male pins to 128 pin QFP Solder Down Module

Find Similar
Find other products with the same:

Top Package
Top Pitch
Bottom Package
Bottom Pitch
Top Pins
Bottom Pins
Product Group
Part Number W9873M Product datasheet

Product Group QFP Solder Down Modules
Clearance Item False
Device 1:1
Top Package 128 pin Male pins
Top Pitch 0.050"
Bottom Package 128 pin QFP
Bottom Pitch 0.8mm

[hondaboy4life]

There's gotta be more companies that can custom make parts. I am currently enrolled in an electrical engineering course thats part of my mechanical engineering curriculum. Its a course thats pretty much 3 EE semesters crammed into one class. The teacher is incredibly knowledgeable and runs his own commercial elecronics company. He designed a big practice circuit board f0r us to use in class. If you could pm me all the info i would need to give to him i can see if he knows anyone that can custom make the chip or where i could find something like it. I wouldn't worry about him trying to steal any ideas aswell.

[wolydotmatrix]

Glad you found a supplier. Would this be doable for the 6spd ECU?? If so which years?

[Singlecam_eg]

So any more infor on wat features you will be able to utilize with this system? A/F, timing advance and retard, dry/wet nitrous control, boost control, launch control, vtec engagement/adjustment, data logging and so on? Price we would be looking at for this? And wat tuning system will it be based off?

[teh CL]

sick stuff..

[wolydotmatrix]

i found that the Crome software understands some of the j software like the timing maps and fuel also the rev point , but that it . i go to make the shift solenoids be used as the boost controller , NOS system controller , and control any solenoid setup. as far as cost i dont know right now . still figure things out.

don
rpm systems

Thanks Don.
Adam

[Darren Kattan]

I've been loosely following this thread on hacking the J32 ecus. As you may or may not know, I've been working with the later model K series ecus for some time now and since we have similar aspirations of making OBD II ecus tunable, I figure I would toss out some ideas.

I am a little curious about how you actually intend on attaching the external EEPROM to the OKI MCU. I've followed a few threads on pgmfi where this had been attempted but if my memory serves me correctly, the data/address pins were used for other things. Is it possible that they are left disconnected in the ECU?

I have seen some rather clever work done on the old school Denso
(Toyota/Mazda) ECUs where a CPLD was used to mux data/address lines during instruction fetches as to not alter these signals during normal operation. I'm not sure if the OKI ECU would allow that, or if you could perhaps modify the code enough to mux these inputs/outputs using other GPIOs, but it certainly would make for an elaborate work around.

Let me know your thoughts.

[gerzand]

Good work Don. With experience as firmware engineer for a large equipment designer, I have quite the respect for your work. Keep it up. I'm sure your solution will be excellent.

well i have been working on hacking the J computer with another person . the MCU is not directly reprogrammable. just like the OBD1 ECU . you have to use a outside source to control the ecu. in the OBD1 ecu you short out a jumper that tells the main MCU to look at a outside source for the code to run the ECU. well the same is true to all the later ecu to follow after the OBD1 ecu . one problem the Keihin corp. did like that we were messing with there hardware. so in later year ECU Keihin corp did not make it easy.

well back to what i was saying about the MCU in all OBD2 and newer ECU. there is a pin if shorted out will look for a outside address for the software to run the ECU. the trick is design a board that will interface will the unit . first step was to get the data off the MCU . so we built a board to read the MCU. i remover the MCU from the ECU and put in our reader.

we have sucked off the data off the MCU. the data that was taken off the chip was 96k of data . to put that in something that you might understand . the OBD1 chips code is only 32k. the reason for the extra code is for the OBD2 crap and stuff for the transmission . we have started to break the data up into different parts . what we come up so far is that some of the base code is the same as the early OBD1 ecu.

the second part is design a board to interface the new code that we come up with. basically how it going to work is we remove the MCU from the ECU. making sure not to damage it. then install our adapter board and socket . re-solder the MCU to the new adapter board . now you have a place you put a chip to mode the code. instead of a chip we are looking to make it usb driven to make it easier.

[gerzand]

well with that said . maybe you can help some on this project.

send me a PM