Modifying Motronic 2.3.2 ECU hardware and software.

[macof]

fuel cut

I have AAN engine with K26 turbo, ECU is from RS2(8A0907551B sw:358289)
I m running higher boost cca 1.5 bar, but i have alway by 6000 rpm fuel cut.
I think this is caused with too much air flow.
I have tried to modify the load limits at 8CD9 and 8CF4 but with no progress.
Is there some other map limiting the load?
Please help me ! Thanks.

[vwnut8392]

im a day late and a dollar short but i finally have the rev limiter figured out.



i'll just keep plugging away and i'll get it all eventually.

to start the rev limiter address in the 551AA ECU 0x8373
the rev limiter fault code is at 0x8375

the equation to that needs plugged into tunerpro for the rev limiter is

7499440/(X*pow(2;3))

The equation for the rev limiter fault code is a little different.

7499440/(X*pow(2;2))

now that one is out of the way there is the 551C AAN ECU and the RS2 ECU that actually had 6 rev limiter and one for the fault code.

for them ECU's the rev limiter is at the following hex offsets.
1=0xA38C
2=0xA38E
3=0xA390
4=0xA392
5=0xA394
6=0xA396

The rev limiter fault code is right after the rev limiters at 0xA397

to calculate the rev limiter's you need to make individual scalars for each one.
the equation to calculate the rev limiter for tuner pro is

11873400/X

dont forget to set the size to 16 bit and tick the LSB first box.

for the rev limiter fault code you need to do the same less tick the LBS first box.

and thats how you adjust the rev limiter in your stock motronic ECU gentleman!

[vwnut8392]

Oh almost forgot this too! Here is exactly what you have to change in the binary in your 551AA boost chip to disable the checksum so that you can live tune your ECU with an emulator and not get fault codes.

track down hex offset 0xB0F starting there the code will look like this.

79 E7 E7 D2 E6 F7

once you have located that just simply make it

00 00 00 00 00 00

Once that is done save the BIN file and your all set! no more worrying about correcting the checksum.


This is the same in all other AAN and RS2 boost chips although the code is in a different offset than the 551AA. through a little binary comparison using HEXCMP 2 you can easily locate that line and modify your own binary. Also you can create a patch in your tuner pro XDF file and let tuner pro handle the binary modification for you.

Here's a stock copy of the 551AA stock boost chip BIN file with the checksum already disabled.

[curamrdan]

I compared rev limiter on 551B against 551C, and probably just last 6. revlimiter value is used. Not tested it real time, yet.

Can anyone have experience how large injectors can be adjusted throught motronic(throught fgat,tvub and fuel map lowering)? I can have 1700cc ones , run on E85 (i mean stoich AFR on idle, low loads, still oem lambda correction)?

[prj]

I've not hit a limit size yet.

But there is a constant that you have to change with bigger ones apart from what you listed.

[curamrdan]

prj: You mean TEMIN or some injector/injection latency (something like i saw in some other ecus ols,damos,xdf..)?
And if i will not be able to found constant you mean, then im limited to what size aprox?

[prj]

prj: You mean TEMIN or some injector/injection latency (something like i saw in some other ecus ols,damos,xdf..)?
And if i will not be able to found constant you mean, then im limited to what size aprox?

550cc with 4 bar FPR.

[curamrdan]

Sound very small.

In other motronic i saw some load factor table, rpm vs tps, which can be manipulate to adjust AFR. I dont know if there is also somewhere,not search for it yet. Or some baro correction, iat/engine temp corrections but i know it is not right way to do.
So you still mean some other constant then i noted in prevousion post, ok?

[prj]

Easy to figure out with assembler. Sorry I have no interest in giving any more info.
I have something much better coming soon - announcement is a few weeks away

[Error404]

I am waiting for this

[andy10v]

I have something much better coming soon - announcement is a few weeks away

What Marc is talking about?

http://theprojectpad.com/viewtopic.php?f=14&t=1589&p=67810#p67810

I may or may not know about an add-in board for motronic in the works that will allow realtime tuning, map select, additional analog inputs. basically what the ripchip should have been, made from scratch for the AAN ecu. it'll be a while, though...

injector offset and voltage compensation
lambda target table
timing vs load
fuel vs load
MAF linearization
spark dwell
rev limit
load cut
launch control
no lift shift
boost control (target MAP and base n75 duty cycle)
speed density support
high speed realtime datalogging
real time map editing
map-select
usb connectivity for map loading
tunerpro software interface to the mapping

what the rip chip wishes it was....

yeah injector scaling of course.

Sounds very interesting, especially if it comes in under VEMS price point! Would you be able to buy it pre loaded with a base map so it could be driven to a tuner?

[prj]

Cat is out of the bag huh.

I'll make an announcement when I have time.

The hardware schematics are finalized, the board needs to be designed and I am manufacturing a prototype soon, then work can start on the software.

Basemaps - yes.

What was omitted from the posted feature list, was stuff like built-in direct ethanol sensor support, wideband / egt control, 4 bank map switching, possibilities to add logging and safeguards for oil temperature/oil pressure/fuel pressure and so on.

The price point is about right 750-800$. The components to make a board that fits into the ECU and can emulate both the fuel and the boost chip at the same time in full realtime are very expensive. And I would not settle for anything less. Flashing? Give me a break.

Let's put it that way, I don't have any expectations to get "rich" off of doing this, and I've been working on the concept for quite a few of my weekends now... but I just will never have time to tune every single 2.2T out there, and if I can put all my knowledge into an easy accessible package then I have succeeded in my goals.

As for standalone ECU's. There are a few concrete limitations in this ECU and I will be upfront and honest about that right away. But it's not really anything people under 1200hp have to worry about. It still should be the most cost effective and solid way to tune anything up to 1000hp.

[vwnut8392]

Cat is out of the bag huh.

I'll make an announcement when I have time.

The hardware schematics are finalized, the board needs to be designed and I am manufacturing a prototype soon, then work can start on the software.

Basemaps - yes.

What was omitted from the posted feature list, was stuff like built-in direct ethanol sensor support, wideband / egt control, 4 bank map switching, possibilities to add logging and safeguards for oil temperature/oil pressure/fuel pressure and so on.

The price point is about right 750-800$. The components to make a board that fits into the ECU and can emulate both the fuel and the boost chip at the same time in full realtime are very expensive. And I would not settle for anything less. Flashing? Give me a break.

Let's put it that way, I don't have any expectations to get "rich" off of doing this, and I've been working on the concept for quite a few of my weekends now... but I just will never have time to tune every single 2.2T out there, and if I can put all my knowledge into an easy accessible package then I have succeeded in my goals.

As for standalone ECU's. There are a few concrete limitations in this ECU and I will be upfront and honest about that right away. But it's not really anything people under 1200hp have to worry about. It still should be the most cost effective and solid way to tune anything up to 1000hp.

i have to say dimitri, i am impressed! i know we dont get along and im sure you know i would never ever buy your tunes because of encryption boards and being locked out of my own ECU but this is the ultimate solution that would make me ditch my VEMS ECU. i know its not open source but with the development of the all of the hardware custom code i know your putting into it something like this cant be free but still totally worth it over buying standalone. i will say i look forward to getting my hands on one of these for my S6 even if i keep VEMS in my 4000.

actually when marc told me about this my VEMS ECU was at his place for repair which i told him to keep the VEMS ECU and send me this setup instead lol. i've worked with ECMlink for mitsu's, crome/crome pro for the honda guys and hondata for the honda crowd and finally a similar solution for atleast one of the cars in the VW/audi lineup.

[prj]

None of my tunes did ever come with encryption boards.
None of my tunes were ever easily editable either though.

[vwnut8392]

None of my tunes did ever come with encryption boards.
None of my tunes were ever easily editable either though.

well thats what i was told by people who bought them. regardless this solution ends the struggle for the rest of us out there. all my goal was to be able to tune my car, plain and simple. never wanted to sell chips or tunes to anyone and thats why i freely gave away the information i learned.