Modifying Motronic 2.3.2 ECU hardware and software.

[curamrdan]

Hi, my non audi experience:

1) its individual, engine setup, wastegate (0%DC) pressure, butterfly diameter... In real there is probably no airflow difference for this kind of power level or at wastegate pressure from 50% to 100% butterfly opening (say by throttle over 50% you cannot "mechanicaly" regulate engine power or boost). So second half is used as a refference to adjust power due regulating higher boost. Key is to find from which throttle opening you are reaching wastegate pressure and from that you can lineary(or whatever you want) add boost. Not expecting many ecu tuner makes to make pulls to set and check boost on every TPS row on every tuned car(maybe on vag ME7 management ). It can be adjusted rought, just to avoid PID loop oscilation(if is even possible on our ecu). Its TPS area and situation where you not spedning too much time during driving.

2)i think the same, just if you will be on low WGDC side, it can result in lower boost in lower gears when is there not time to loop make the work(add enought WGDC). If on higher ower "ideal" i expect to by spiky on higher gears. But noone help me with my question one page ago(about boost axis and WGDC vs boost target), so i did not start to mess with factory boost control and used external EBC.

J.

[-ice-]

Hello,

long time, I did not care about my hobby

I restarted today with the boost control and want to gain some experience with it.

1. if we look look at the target boost values of a stock rs2 we set that from TPS higher then 50% higher boost is programmed. From the physics this may make sense not to build up boost which can not really pass the throttle flap. Might also be stressful for the turbo I think. How do we find a good crossing here?

2. if we look at the N75 duty cycle. Of course the duty cycle must be big enough, so that the desired boost can be reached and the control loop can eliminate the regulating difference. Is it therfore wise to start with a smaller duty cycle and check if with that the wanted boost can be reached. What would happen if the duty cyle is too high. Boost overshooting?

Best regards,

Daniel

[vwnut8392]

LOL.
The MAFs are identical apart from the mesh.

nice to know. i am just trying to be helpful and answer questions.

[prj]

are you are running an RS2 MAF sensor because the resistor mod is not necessary essentially to run RS2 software. if you are still using the stock AAN or 3B MAF try changing the resistors back to stock.

LOL.
The MAFs are identical apart from the mesh.

[vwnut8392]

Another real life question after some time. Already run 551B RS2 software with resistor mod, fuel tuned spot on with gasoline.I swapped injectors from RS2 (EV6 white) to 750cc EV14. Adjusted FGAT0 from stock to low around 70(raw dec value) to get stoich idle (no need touch temin , why?). But, it makes huge inbalance in main fuel correction map, i need to have low load same large values as in high load to get correct fuelling. Mid load is lowered seems as expected.
TVUB is rised to suit EV14 better, im on 1ms/14v so rising it even more makes no sense, but probably helps to lower high fuel values in low loads.

I used these injectors on friends S2 stock engine(just turbo) but with E85, so FGAT0 was not adjusted as deep, so not much problem with this.

My guestion if its normal and tune fuel to suit the engine or i missing something?

Enclosing actual fuel map, still around 10afr at 1bar+ boost , it was first drive.

are you are running an RS2 MAF sensor because the resistor mod is not necessary essentially to run RS2 software. if you are still using the stock AAN or 3B MAF try changing the resistors back to stock.

[curamrdan]

Another real life question after some time. Already run 551B RS2 software with resistor mod, fuel tuned spot on with gasoline.I swapped injectors from RS2 (EV6 white) to 750cc EV14. Adjusted FGAT0 from stock to low around 70(raw dec value) to get stoich idle (no need touch temin , why?). But, it makes huge inbalance in main fuel correction map, i need to have low load same large values as in high load to get correct fuelling. Mid load is lowered seems as expected.
TVUB is rised to suit EV14 better, im on 1ms/14v so rising it even more makes no sense, but probably helps to lower high fuel values in low loads.

I used these injectors on friends S2 stock engine(just turbo) but with E85, so FGAT0 was not adjusted as deep, so not much problem with this.

My guestion if its normal and tune fuel to suit the engine or i missing something?

Enclosing actual fuel map, still around 10afr at 1bar+ boost , it was first drive.

[blackS2]

I used the one from VEMS shop

https://shop.vems.hu/catalog/jpt55-connector-p-109.html?osCsid=780868b6af9176025d358948556dc8e3

[vwnut8392]

yes that motronic connector will work with our harness but not as a direct replacement on the OEM motronic because of how ours is a 2 piece connector. if your going to build a jumper harness for standalone to your factory wiring that connnector is perfect. when i built the jumper to my VEMS i used an old ECU from an early 90 7 series BMW to get a 55 pin connector. hope that helps!

[_ShurikeN]

55-pin connector as ours. It should fit, but you can sooner source cheap ECU from BMW or opel with the same connector. And probably better quality.

[Thuppu]

Quick quastion, does this connector fit our Audis? https://www.aliexpress.com/item/Auto...357501442.html Different motronic version, but is the connector the same?

[Acki]

Wasn't that some pages ago explained?! Overboost etc?

[macof]

Hi,
sorry for off topic question,
can anybody here help me with stationary rev limiter on standard RS2 non immo ECU?
No problem to pay for helpfull info or file.
Thanks

[curamrdan]

Thanks. I have lack of knowledge to dissasembly by myself alone. So im decided to shoot in the dark sometimes, realtime testing by emulator. But i dont have latch board only external ziff socket, so i would be happy for any more info or will end to use external/mechanical boost solution.

Do not care exact axis numbers, now.
Are the values in wgdc table real duty cycle numbers? Is so, why it not correspond to request...if axis are the same?

[kymi]

It seems to me that you haven't done much or any disassembly? If you know how those maps are read, you have at least the raw values of the axis. There are now too much assumptions and even the easiest things missing.

I checked a few binaries and they all have identical axis maps in the binary.

[curamrdan]

Made two pictures, to better understand. 551A you can see WGDC coresponding to Request. Not as RS C software.
Tables are in raw dec values(we can roughly estimate request for 250/300kpa sensor, but its not the case now).

Axis are the same for both tables? And are the same in both softwares?