MAP Settings V2 vs V3

[MickyMcFinnigan]

Good Day,

Audi A3 8P VR6 BUB Plug n Play ECU.

I was doing some logging today and noticed my Lambda was struggling to hit target. On closer inspection it seems that my MAP sensor is inaccurate when compared to similar V2 logging.

Most, if not all V2 tables and fuel settings have been carried over to V3. Most parameters are configured in a “like for like” best I can tell. However I am noticing a pretty significant KPA change from one to the other which leads me to some questions, particularly to do with the Plug and Play version of the VW BUB ecu (Likely applies to the BAM/AGU etc)

What are the settings supposed to be for MAP configuration. The Plug and Play ecu’s come with a 3 wire Bosch external MAP sensor, wired to an extra connector on the ECU. In V2 I assume it was wired to the internal map components to mimick the standard frame EMU Black. That is how i have it set and have not had any issues up to this point.

Setting it similarly on V3 and I can’t seem to bet the settings to work. I have attached screen shots to give a better understanding. Given not everyone uses the plug and play ecu’s, this may be a 'niche" question. But surely someone else will eventually run into a similar issue.

When I have “Use Build In Map” selected on V3, with sensor calibrated…the MAP sits at 141kpa with the car off…which I would expect to see 100.

I can provide more information. but on a light drive last night I noticed some wild swings in Lambda and a real struggle to hit target. thought it may be DBW settings but today noticed the MAP is tracking in parts of the VE table I wouldn’t expect it to should the sensor be correct.

Thanks again.

[Jadzwin_ECUMASTER]

Your settings in V3 seems to be correct. It is strange that it reads 141 kPa.
It look like it uses 400kpa MAP sensor calibration instead of yours 300kPa calibration.
Could you please attach your base map and log ?

[MickyMcFinnigan]

Files attached. @Jadzwin_ECUMASTER

newest_build_8.emub3 (58.8 KB)
20240421_1421.emublog3 (358.3 KB)
20240420_1954.emublog3 (5.2 MB)

[Jadzwin_ECUMASTER]

I’ve check and tested the code and readings from internal map sensor input seems to be perfect.
In the software version 3.024 that will be release today or tomorrow I added additional debug so we will be able to tell more.

[derUltraTT]

Something what i noticed…the internal map sensor reading seems to be slightly different between V2 and V3.
In engine off condition i see a MAP difference of 4kpa.
I corrected it with the offset setting and hope the difference is static😂

[m4rt1n]

@MickyMcFinnigan

Good Day,

Audi A3 8P VR6 BUB Plug n Play ECU.

I was doing some logging today and noticed my Lambda was struggling to hit target. On closer inspection it seems that my MAP sensor is inaccurate when compared to similar V2 logging.

Most, if not all V2 tables and fuel settings have been carried over to V3. Most parameters are configured in a “like for like” best I can tell. However I am noticing a pretty significant KPA change from one to the other which leads me to some questions, particularly to do with the Plug and Play version of the VW BUB ecu (Likely applies to the BAM/AGU etc)

What are the settings supposed to be for MAP configuration. The Plug and Play ecu’s come with a 3 wire Bosch external MAP sensor, wired to an extra connector on the ECU. In V2 I assume it was wired to the internal map components to mimick the standard frame EMU Black. That is how i have it set and have not had any issues up to this point.

Setting it similarly on V3 and I can’t seem to bet the settings to work. I have attached screen shots to give a better understanding. Given not everyone uses the plug and play ecu’s, this may be a 'niche" question. But surely someone else will eventually run into a similar issue.

When I have “Use Build In Map” selected on V3, with sensor calibrated…the MAP sits at 141kpa with the car off…which I would expect to see 100.

I can provide more information. but on a light drive last night I noticed some wild swings in Lambda and a real struggle to hit target. thought it may be DBW settings but today noticed the MAP is tracking in parts of the VE table I wouldn’t expect it to should the sensor be correct.

Thanks again.

Same here with 3.025 and pnp emu bfh with 3bar map
Engine of it shows 139kpa,same settings v2 98kpa

[Jadzwin_ECUMASTER]

Could you please post here your base map ?
I will check on the bench. It is really strange

[m4rt1n]

first step, just starts and idles

erste.emub3 (57.7 KB)

perhaps this is important:

i tried to change map sensor to 400kpa in V2 (2.168) some days ago, with correct calibration it showed 138kpa without engine running too

[Jadzwin_ECUMASTER]

I will check it today. There is somethin I’m missing 'cos I couldnt replicate the problem, but apparently the problem exist.

[Jadzwin_ECUMASTER]

What I can see you have set use internal MAP sensor.
It assumes 400kPa MAP sensor.

You need to “untick” this option, and select Internal MAP analog input for MAP analog input option.

[m4rt1n]

Worked with these settings. thanks

Edit

What I’ve noticed the 300kpa with settings from above is 97kpa with engine shut off

Changed to 20-350kpa (0,3-4,7v) and there it stays at 107kpa with engine off

Same environment conditions

[Jadzwin_ECUMASTER]

I assume inproper calibration values

[m4rt1n]

Vw genuine datasheet and oem sensors

[Jadzwin_ECUMASTER]

It works as it should. The function for given values is map = V * 75 - 2.5

Unfortunatelly internal MAP analog voltage is not logged. You need to measure the voltage with the multimeter and check

[m4rt1n]

It is working was my fault
Took wrong values