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)
The engine is now running well, some tuning is still ahead.
- Did some driving around and engine feels very good in low kpa area. Haven't got a chance to tune higher kpa range yet.
- 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
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.
Megatune settings (06-Jan-2006):
My config.txt and tables.txt:
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
Will add wiring diagram later..
Hardware changes made to V3.3 board
- Trigger related
- R182 shorted (instead of 100k in primary trigger)
- 10k pullup to 5V for crankhome VR signal
- crankhome VR inverted in firewall connector, not as in original motronic
- C103 replaced by 1nF
- All ign channels changed to logic level
- IAT pullup changed to 470ohm
Hey Miska,
what is the current status of the Auditrigger?Did you fund the pest pullup values yet??Im really interested to go with the stock trigger setup on my AAN/3B hybrid,instead of the sloppy 5 window hall!!!Please tell me your final resoults (special problems,what for watch out etc.),
thanks in advance, MembersPage/NanassyPeter
Trigger works just fine, all hw related modifications are as listed above:
- R182 needs to be shorted (to charge peak capacitor from single pulse)
- 10k pullups added to both VR-signals (I'd guess only home signal needs this)
- C103 replaced by 1nF (instead of original 220nF on board)
- Secondary VR signal must be inverted. Easiest to do this on black 3-pin connector located to firewall, one pin is shielding, 2 for signals.