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Hacking up Honda's ECU
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PostPosted: Sun Sep 20, 2009 10:13 am 
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Joined: Mon Nov 17, 2008 3:28 pm
Posts: 35
Location: Wroclaw/Poland
Hi guys.

I've been reading PGMFI.ORG forum since some time, but time to ask first question has come...
This is my first post, so please forgive lack of my knowledge.

I've found lots of very interesting info here, which allowed me to replace my stock OBD2 to OBD1 ECU (B18C4 engine), I've tuned AFR and want more... One thing stops my progress in my "tuning" attempts - Real Time Programming. Removing, reprogramming and placing EEPROM in socket each time I want to change any parameter is very annoying.

I've searched over whole forum and found only two methods of RTP:
1. using rom-emulator (as Ostrich, ROMulator or sth)
2. using Easy RTP 1.0 by Blundar

2nd option requires cutting off some PCB tracks and soldering new wires. I wish to leave my ECU as stock (expecting addition of external eeprom and datalogging support) as it is possible.

I want to build my own rom-emulator (instead of using Ostrich or ROMulator) which will cooperate with Crome RTP capabilities. AFAIK Crome supports three communication protocols: "OBD1 PGMFI RTP", "Xenocron ROMemulator", "Moates Ostrich". Is any official/onofficial specification of any of those protocols available? I want to make my emulator compatible with crome in most convinient way. I want to upload map to ECU (via USB or RS232) immediately after modification of it in Crome. I'm asking because I didn't found any similar project on this forum and escape from time consuming transmission analysis.

Additionally please give me any directions to search for what, if U think that my idea is weird.


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PostPosted: Sun Sep 20, 2009 11:48 am 
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PGMFI Elf

Joined: Tue Jul 27, 2004 2:17 am
Posts: 1409
Location: Phoenix, AZ
The Moates.net Ostrich protocol specifications are available on their website.


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PostPosted: Mon Sep 21, 2009 3:09 am 
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Joined: Mon Nov 17, 2008 3:28 pm
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Location: Wroclaw/Poland
Thanks!

I've found so far only information that Ostrich/APU1/BURN1 uses the same protocol as TunerPRO RT and FlashBURN. Is it right?
I can't find any description of transmission protocol on Moates.net website.


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PostPosted: Mon Sep 21, 2009 1:42 pm 
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Joined: Mon Nov 17, 2008 3:28 pm
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Location: Wroclaw/Poland
OK, I've got what I need :)
Everything is available here:
http://wiki.xtronics.com/index.php/Romu ... r_protocol

I hope it will be enough...


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PostPosted: Tue Nov 17, 2009 3:51 am 
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Joined: Mon Nov 17, 2008 3:28 pm
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Location: Wroclaw/Poland
If anyone is interested:
I did prototype of Xtronics ROMulator compatible device, It supports complete protocol of ROMulator and works with Xtronics control program, CROME and should work with tuning tools for other cars too.

Actualy it emulates up too 32kB EEPROM.

Device is a complicated more than it should be, but everything works as I expected... ;)

Cost of device on Poland is about 30$, but it requires some soldering skills to assembly it.

So if anyone needs info, I'll help for sure.


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PostPosted: Tue Nov 17, 2009 7:07 am 
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Joined: Mon Nov 17, 2008 3:28 pm
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Location: Wroclaw/Poland
OK, for those brave souls, who want to test it, here are some basic information:
- in schematic and PCB layout ugly bug is present - OE of U6 have to be cut and OE signal from socket should be wired to OE of U6.

http://obeny.obeny.net/honda-rtp


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PostPosted: Fri Jan 01, 2010 11:58 am 
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Joined: Tue Mar 17, 2009 2:55 pm
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Do you have any schematics?


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PostPosted: Thu Jan 07, 2010 8:20 pm 
anymore updates? schematics?


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PostPosted: Fri Jul 01, 2016 10:30 am 
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Joined: Fri Feb 12, 2016 3:02 am
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There's a block diagram schematic on the link posted.

I am going to attempt to build this rtp.

Wish me luck.


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PostPosted: Fri Aug 26, 2016 7:49 am 
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Joined: Sun May 17, 2015 9:25 am
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hi,

i also tried to make this rtp. there are some obstacles i ran into. there is no clear diagram on how to connect the rtp to dill 28. i am not sure the firmware on the link is usable. i was goin to make this using all smd parts.

https://postimg.org/image/pbekecdst/


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PostPosted: Sat Sep 10, 2016 3:54 pm 
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Joined: Sat Jul 10, 2010 2:45 pm
Posts: 273
Location: New castle k.b
The rtp is cannot running online or auto update. It give MIL and poping engine every time you make adjustment. Since the design using single line memory. The ecu lost the data to read while crome update write to memory.


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PostPosted: Sun Sep 11, 2016 6:54 pm 
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Joined: Sun May 17, 2015 9:25 am
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i think this device was not intended to adjust the rom real time. It seems that after you made runs and capture some data logs. you are suppose to pull over and do the adjustments while the engine is turned off. The author was selling some blank boards a while ago for 80usd i saw at some other forum. from the youtube he posted it was able to update in real time, maybe it was a already a diffrent updated version.

https://www.youtube.com/watch?v=Ft-6gS-Rzs4

https://www.youtube.com/watch?v=TCyubfK5_HY

how are you able to figure out where the zif pins would go ?


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