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25.04.2021, 16:29 | #1 |
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VAF to MAF conversion on a VW T3 DJ WasserBoxer Vanagon
Hello Everybody,
I'm planning the installation of my converter on my T3, but have several questions because I'm unsure about my right understanding of the instructions. First I understand that the lambda is mandatory for the first setup, but mine is badly placed in my opinion. I put it in the silencer (I soldered it by myself, there is no OEM place for a lambda in this exhaust, my lambda only serves for a dashboard gauge, since my ECU (Dijijet) doesn't take this information into account), so its signal is not very accurate I think (it goes regularly from very lean to very rich, but rarely between both, but maybe it's because of a worn VAF...).
Second, I have questions about the wiring.
I have made a draft of the wiring plan which you can find here if needed for verification and comments => https://www.dropbox.com/s/wqn86sofvr...p1%29.pdf?dl=0 Thank you very much in advance for your help and have a nice Sunday ;-) Jean-Christophe |
28.04.2021, 17:13 | #2 | |||||
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Hello Jean-Christophe
Цитата:
Without it you will get a very bad results and very big fuel consumption. Here ir video on russian about wrong installation of oxygen sensor https://youtu.be/O1c_cp30GNo You can try to enable autotranslation of subtitles - hope that about 70-80% will be clear for you. In a short words if the oxygen sensore installed in a bad place - it will give a very slow response and it will be difficult to tune the mixture properly. Цитата:
Цитата:
Цитата:
Accordingly to first scheme your airflowmeter has next pinout: 1- Air temp sensor 2-Signal output 4-Ground 3-reference voltage 5v Now put one proble of multimeter on engine and with other probe check voltage on all contacts and let us know the result. if ref voltage trully 5v? then you dont need to connect it to the converter - just set the jumper on the converter to the" motronic" position - in this case the converter will use internal 5V as reference voltage. 2. Output 8 of the converter must be connected to the wire wich goes to pin 2 of genuine airflowmeter 3. It will be better to find the pinout of this siemens in a corresponding audi workshop manuals. 4. You right TPS or VAF input was used in first firmwares to compare both signals from different airflowmeters installed in series, but this method gave a bad results so we decided not to use it. In the next firmwares we use this input to switching between tables or for selecting different reference values of oxygen sensor for tuning algorythm. Now you dont need to use it at all. Цитата:
1. You should find the signal ground of genuine airflowmeter and connect ground of the converter and new airflowmeter to that wire, otherwise you will get a lot of noise in signals. 2. During tuning process connect supply of the converter and new airflowmter directly to the battery + via a 5A fuse - this will make tuning process very simple, beacuse the software will not loose connection with the converter in this case. After all tunings will be done , you will connect reconnect the supply wire to some ignition switch supply. At this moment i higly recommend you not install new maf, but just install the converter in series with a signal of genuine vaf. You will need to connect ground, supply, oxygen sensor signal, cut signal wite from airflow meter and connect one part to MAF input and other part which goes to ECU to the " converter output" Put in the converter 1:1 table and start engine. Look and try how the correction an autotuning works, how it uses oxygen sensor etc. After you understand how all works - next you can place there a new maf. Also you can make some logs of how your genuine airflometer and oxygen sensor works and post them here - i can check it and confirm is all ok or not. Последний раз редактировалось Pin; 28.04.2021 в 17:28. |
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11.05.2021, 19:33 | #3 | |||
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Hi Pin, thank you very much for your answer and all my apologises for my answer delay, lots of work these days
Цитата:
Цитата:
1- 5V 2- 1 MegaOhm 3- 5V 4- 0 ohms (ground) => what surprises me is why are they 2 x 5 V ? The ECU uses the only signal of pin 2 (aggregate of temperature info + mass of air aspired) to decide the mixture to do ? Цитата:
I take note of everything you have told me and keep the work in progress ! Thank you very much for your help, Jean-Christophe |
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12.05.2021, 14:41 | #4 |
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Hi Pin, If I open the VAF to see the internal connexions, won't give it to us the ability to check the connections to use?
https://www.dropbox.com/s/2rpwmplx8b..._6350.jpg?dl=0 Thank you very much in advance for your help ! Jean-Christophe |
19.06.2021, 21:44 | #5 |
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Hi Pin, I followed your advice and connected my VAF through the converter.
Here you will find 2 screenshots of the software connected to the converter (I made the engine run from idle to 5000 rpm. I didn't made any roadtest but have the feeling the engine runs already smoother - the AFR gauge I have on the dashboard shows a more tuned mix, as the original setup seems to be very often lean) : - conversion table : https://www.dropbox.com/s/33mcx8w8cz...00.20.png?dl=0 - log graph : https://www.dropbox.com/s/26ssrz0l9y...01.38.png?dl=0 Here you will find the log :https://www.dropbox.com/s/rly0kfx0ln...01_20.log?dl=0 and here the tab : https://www.dropbox.com/s/po2c56zpl5...01_17.tab?dl=0 Now I'll try to fit the MAF, I bought the Siemens you recommend because I couldn't find the diagrams for the Passat one I already had. |
20.06.2021, 18:34 | #6 |
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Hi all, tried with the MAF, today, IAT installed but out of the intake, and warm engine so it hasn't be very easy and I had to stop my test before the engine went warm, so very little test, but idling was acceptable.
Logs here : https://www.dropbox.com/s/uqcud0jukz...06_14.log?dl=0 https://www.dropbox.com/s/pq4bzso7fo...01_17.tab?dl=0 And for wanagon owners, my incredible temporary setup ;-) : overview : https://www.dropbox.com/s/co3y8zq7v6...%2031.jpg?dl=0 detail : https://www.dropbox.com/s/l2qr3pqrym...%2039.jpg?dl=0 The top of the pop do it yourself origin compliant connectors :-D : https://www.dropbox.com/s/cirg9o81k5...%2049.jpg?dl=0 The rough diagram of my connections : https://www.dropbox.com/s/832w5ldyz7...C3%A9.jpg?dl=0 Tomorrow afternoon I will try to do a real MAF setting. |
25.06.2021, 14:07 | #7 |
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Hi JCF,
I checked logs from msg#5 - it is ok in general. But i see a spikes on oxygen sensor signal. Let me know from which point did you take supply ground of the converter? Also please check ignition system totally - high voltage wires with a multimeter and set spark plug's gap to 0.85-0.9mm . Also check ground wire from chassis to engine/gearbox. And let me know how much wires goes from oxygen sensor - 1, 2, 3 or 4. |
25.06.2021, 14:14 | #8 |
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JFC's setup
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25.06.2021, 14:19 | #9 |
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In msg#6 Log is very strange( a lot of spikes of the converter output) and i dont see a table, which was used when this log was making.
I think there culd be issues with a ground or with an ignition system. |
02.07.2021, 03:00 | #10 | |
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Цитата:
I'm in the process of refurbishing the exhaust, unfortunately some screws broke in the cylinder head (big shit... ), so I don't know how long I'm going to spend on it to be able to put it back together and continue my injection convertion tests |
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