NefMoto

there is a Volkswagen Touareg  with a motor from golf 4 vr5 2.3 l 066906032AK . how to reduce fuel consumption by impoverishing the fuel mixture from 1 to 14.7 to a mixture of 1 to 16.5 ? When the engine is running without STFT, when the mixture of 1 to 16.5 was set up with gas equipment, the fuel consumption dropped from 11 liters to 9 liters per 100 km. how to write a fuel mixture of 1 to 16.5 instead of 14.7 in the engine firmware ?

I asked a question similar to this on my v8 on a different forum . Not this one and I got told to buy a diesel

Several threads on this form regarding lean burn. No one is going to hold your hand in using the search function

I don't see the desire to do any sort of "economic" tuning.. Factory flash is most often plenty economic. 1:1 stoich for most situations, enrichening and leaning of the mixture when necessary.

just the same, no. having the ability to adjust the fuel mixture using gas equipment, I achieved a record fuel consumption for a large four-wheel drive SUV of 8.7 liters of propane gas per 100 km. and this record was achieved only on a mixture of 1 to 16.75-16.7, which I observed on the indicator of a broadband oxygen sensor. With standard engine operation on a mixture of 1 to 14.7 , the Tuareg consumes 10.5-11 liters of gas per 100 km . How can I change the working fuel mixture in the firmware? where can I find a limiter limiting the fuel mixture to unit 14.7 ?

the problem is to find a limiter that does not allow you to make a fuel mixture of more than 1 to 14.7. They say that this is a limitation in the firmware code

in our country , the price of propane gas is 2 times lower than for diesel fuel . on a fuel mixture of 1 to 16.7 , I achieved a consumption on a Volkswagen Touareg1 with large 33-inch wheels of 8.7 liters of gas per 100 km. this is equivalent to 4.4 liters of diesel fuel per 100 km. therefore, it is very advantageous to make a working mixture of 16.7 in the firmware on economical driving modes

No wideband, no chance to regulate other value then 14,7:1. Take a look how such normal "jump" lambda sensor is working.

You can make a trick and install a wideband controller with programmable output, e.g. innovate LC2 or also other. Then use this output instead to normal lambda sensor input and manipulate value to your desired value. Anyway you will get a constant offset, but for ecu it´s still Lambda = 1.

None of that is needed. The narrowband can see a lot more than just 14.7.
Just by changing the switch point voltage you can go to 16.xx AFR.

But you still need a wideband to see where you are with the mixture.

Its a wideband ecu

Didn't check. WB needs a small patch iirc.
Narrowband easy in CAL by changing switchpoint threshold.

  I have both a wide-field oxygen sensor and a second simple one. I need a mixture of 16.6 only in the range of 1000-2300 rpm and when the gas pedal is pressed no more than 30% , so there is no way to do without flashing the ECU. Because in other ranges of engine work, valves burn on such a mixture

  my ECU has both a wideband and a simple oxygen sensor. The adjusters say it is necessary to disassemble the code in the firmware so that there is no restriction of the mixture in 1 to 14.7 in the firmware , and then I was able to prescribe a mixture of 1k 16.6 . Is this so? , or is there a simpler method

Yes and no simpler method.
Also in case of LPG you are not going to burn anything by running lean. Further away from stoich burns colder not hotter.
Might need to adjust timing a little though.

It is so, and if you not gonna do it by yourself, you need to pay someone on here to do the "hard" part.

Really though if you want to be economical in a touareg you wouldnt have used a gas guzzler design mpi VR5 in it IMO.

It is really amazing how wide spread misconcepts with colder/hotter burning mixtures of different fuels exists.
Hundred of times I heart from local "tuners" that richer is better - even for diesel and LPG running engines.
They can't understand that LPG injected in gaseous state (maybe 99% of locally fitted lpg systems) totally screw EGT regulating attempts of motronic.

Yeah lean lpg mixture will not burn exhaust valves, however incorrect ignition timing and running on stock LBTS mixtures can do the trick.

I only need help to remove the restriction of 1 to 14.7 fuel mixture in the firmware . and I will correct the fuel mixture maps myself . the best idea for me would be if someone had damos for this firmware on the vr5 170 horsepower

removing lambda=1 "restriction", which is hardcoded in ME7 is "hard" part that was quoted by Blazius.
It is not possible to change it, only modifying calibration area, so damos will not help you in this.

ME7 will select lowest lambda value (lamfa, lambts, lamkh etc) as long as it is lower than 1.
it is something like desired lambda = min(1, lamfa, lambts, lamkh,,,)
You need to change this 1, and it is hardcoded, not coming from any table, line or variable.

then how do I make the motor work in the modes I need on a mixture of 1,14 ? Maybe there is an possibility to make a fuel mixture of 1 to 16.6 in another way

No there is no other way.
As prj already stated, if it is narrow band O2 sensor ECU, then there is workaround that can be exploited, but when it is wideband ECU only possible solution is changing hardcoded value in firmware.
Is it clear now?

Maybe you can build some shitty Arduino "translator" between wide band O2 sensors and ECU, but I doubt it will be much cheaper and doing so you are introducing more complexity and more points of failure.

is there an option to change the linearization of the oxygen sensor in the firmware so that it lies to the ECU and shows the wrong mixture? and then I corrected the cards , taking into account the incorrect readings of the lambda probe .
Or where can I learn how to change the constraints in 1 ?

Very strange decision. Just find somebody who can find lambda constants in the code. And give to him some money for this work.

and who can? I didn't find anyone. And I myself would like to understand and know the firmware

You asked me at the drive2. Youve got the price

well, it's a market. we need to ask all market participants and know all the prices who will do for how much. And not to rush to the first one who answered.

I can do it. $400-$500 depending on how long and how annoying you are to deal with.

   do we have a forum or business platform with chiptuning announcements here?? Why is everyone here only selling their services, and not suggesting how to solve the problem?

Here is how to solve the problem:

Option a)
1. Disassemble the file.
2. Find where the limiter is for lambda = 1.
3. Modify it to whatever you like.

If you have no experience, it might take you a few years.

Option b)
Pay someone who spent these few years of their life learning it to do it for you.

So I am a chiptuner. only I make a chip on the edc-15 1.9 tdi and 2.5 tdi. Therefore, I want to learn how to make a chip on me7.1. Where can I learn chip tuning of these ECUs and where to start looking for the lambda 1 limitation. I am ready to study for several years .

Start from this thread http://www.nefariousmotorsports.com/forum/index.php?topic=2515.0title=
and continue search by "lean burn" words.

I can, others can too. PM me.

If not do what prj said and follow prometeys thread and the various dissassembly threads and scripts to do it. Everything is there for you to learn how to do this.
Depending on how hands on you are it might be better just to pay someone as you can focus on your core issue rather than possibly waste time.

Oh and "chip" tuning on ME7 is a tiny bit more complicated imo than EDC15 and 16 which everyone copies or you can just do what most "tuners" do and download shit flash files and flash em.

no. I made the chip on the edc15 at a high level and on my own. I wrote firmware for different sprayers and turbines. With 1.9 tdi , 270 horsepower was made . I have a lot of time, so I want to study the topic, but I just can't determine where to start. The first is to read the topic proposed
prometey1982

If you've never written code or disassembled code even, then you haven't made jack sh!t and you're not writing firmware. There's enough threads on here about reverse engineering and disassembling, and you expect us to spoon feed you all of it?

and just to help show the address in the firmware where the limiter is written in 1 will be a big loss for you ? or suggest that you can simply change the linearization of the oxygen sensor thereby deceiving the ECU

Stop begging for shit. Nobody owes you anything here!!!
Do it yourself (all info here on forum) or pay.

I am ready to pay, I am looking for someone who is cheaper and the mixture of 1 to 16.6 will be made correctly on economical modes