My daily driver, Audi S6 avant -95, 2.3L inline 5, 20 valve turbocharged engine (AAN).
Installed VEMS as direct replacement of original ECU (see PlugAndPlayMotronic) using factory wiring. Extra wires are needed only for WBO2. There are some modifications with the trigger wires as well (swap secondary VR signal wires in 3pin JPT connector on firewall).
Megatune settings for slightly modified 1.0.53 firmware, including new BoostController code (Update 09-Oct-2006): [MT config]
mcd.txt and mct.txt (09-Oct-06):
The engine is now running well, some tuning is still ahead.
- Lost spark around 6k with auditrigger setup is still valid, reason is now probably known
Some help needed for NTC curvefitting. I'm using pre-generated clt 2063_256.hex table from ntc_properthem.zip and it is a pretty close match already. However there is a minor mismatch between the temperatures:
| real temp | MT display | Fahrenheit | temp_internal | adc | temp_internal_wanted |
| +4C | +9C | 48 | 88 = 0x58 | 157 or 158 | 79 = 0x4F |
| +84C | +79C | 174 | 214 = 0xD6 | decimal 23 | 223=0xDF |
- I can provide a few more measured points if needed. Board AREF=256
- instead of more points, real NTC resistance would be nice, at same points (and voltage if easy to capture)
I think this is impossible with AREF=256 (because the error signature is different at the two ends). Something like 1900 Ohm, aref=265 would be close.
Are you sure aboute the +79C point ?
Some old things below:
Some open issues to solve
- Tachometer is not always showing proper rpm value, sometimes it falls down to near zero for a very short periods of time. Needs still verification of original tachometer signal with scope.
Note about the time-saving effect of wiki-written documentation
It's notable that this install was carried out before other competing installs (despite that it was done in the cold, while competing installs had a warm garage host), because documentation discipline was appr 60%.
Competing installs have 10 and 40% documentation discipline so they lost, and might struggle for a few more days or weeks.
Even for this install, 3..5 days could have been saved with 90..100% documentation discipline, the firing order alone could have saved 1..2 days.
Airtemp sensor data:
Some values to make verification easier: Note that pullup is 470 Ohm not 2700 Ohm
- -40,395 temp_internalformat=0, adc_read=117 (256/ (470+395) * 395)
- -20,425
- 0,457
- 20,490
- 30,503
- 40,520
- 60,555
- 80,585
- 100,620 temp_internalformat=254, adc_read=146 (256/ (470+620) * 620)
Note that the tables are quite steep. The MAT goes from min to max from position 0x75 .. 0x92.
For the prepared tables, look for "PTC" on EasyTherm
Flying wire adaptor for basic functionality from genboard (v3.3) towards motronic connector (pins Mxx)
- 5x high-Z injectors (INJA..E to M36,M17,M34,M35,M16, INJA = cyl #1 and so on)
- 5x ignition coils (with power output stages) (IGN00..04 to M01, M02, M23, M20, M21, IGN00 = cyl#1 and so on)
- so h[2]=03 01 00 02 04 ... required to match 53124 fire order as requested on InputTrigger/AudiTrigger !!!
- BoostControl solenoid aka WGFV (INJG to M33)
- Idle air controller (INJH to M04)
- Fuelpump relay (P259/5 to M03)
- Trigger signals
- 2x VR (M47 home signal, M49 rpm, M48 GND), home signal has inteverted polarity!
- 1x Hall for camsync (M08), InputTrigger/AudiTrigger setup
- GND and Supply voltages
- 12V supply
- M18 has 12V, M27 switched, to additional relay
- to board itself (EC18/25), from additional relay
- supply for injectors, relays (M37), from additional relay
- 5V to hall, TPS etc (EC36/28 to M12)
- 3x GND5 wires (M21, M24, M32)
- GND wire (M10, connected to engine), connect back to M30, GND for sensors
- 12V supply
- TPS sensor signal (M53)
- CLT (M45), IAT (M44) sensors, for IAT
- Tachometer (I259/7 to M40), 5V signal, divider=01
- Knock sensor (EC18/03 to M11 #1, M29 #2 unconnected)
- WBO2 sensor
- 5x extra wires needed
- original MAF connector is not used with VEMS. There are only 3 signal wires + gnd + supply, so MAF wiring is not usable for WBo2. Anyway, MAF uses 6-pin JPT connector, VAG part 022906233A for housing + 022906102B boot
Hardware changes made to V3.3 board (inside ECM)
- Trigger related
- R182 shorted (instead of 100k in primary trigger, to charge peak capacitor from single pulse) this improves noise immunity
- added 1uF cap in parallel with C40 (longer peak hold time)
- 10k pullup to 5V for crankhome VR signal (~40k seems not to be enough in all cases)
- crankhome VR inverted, not as in original motronic (inverted works with motronic too). Easiest to do this on black 3-pin connector located to firewall, one pin is shielding, 2 for signals.
- C103 replaced by 1nF (instead of original 220nF on board).
- All ign channels changed to logic level (2+6 setup is ok as well)
- MAT pullup (R10) changed to 1k+1k in parallel (500 ohm) in order to work better with stock MAT sensor
- AREF shorted to AVCC (AREF=256)
- Resistor for primary trigger reference pulse 75k -> 33k
28.8.2006
Hallo Miska,
now your car is running well? How is the start-up, idle and warm up? How does your car behave in Part and WOT?
Do you managed to get the Knock sensors to Work?
What ignition system are you using? The same as ABY and ADU? Your cylinder head seems like the 3B one.
Can you please post your latest MT file?
Thanks
Vasilis, MembersPage/Billman
Hi Vasilis,
see MembersPage/Billman/PlugNPlay page for some comments