Oskar Nilssons Audi S4
Technical data
Audi S4 2,2t -92, AAN-engine without modifications so far, VEMS v3.3 with Motronic connector, box no. 1045.
Status
The engine has been started and given a base VE tune up to 0.6 bar boost, this process took less than 15 minutes after engine was warmed up using the wideband.
The installation was very smooth and it started up right away thanks to great configuration tips and files from MembersPage/MiskaPeippo and MembersPage/TeppoKalske.
More work is needed on the boost controller settings and idle control. Both worked out of the box but two things needs work with the settings:
- Only 0.6 bar boost (solved, read below)
- 1700 rpm after hot start, went down to normal idle after 10+ secs.
- Idle control doesn't catch the engine fast enough
The boost-problem is solved. It was caused by a huge leak in the rubber hose between the turbo and the intercooler. Tried with open loop to control the boost solenoid manually and with the solenoid completely closed to get maximum boost I still only got 0.6 bar boost. So Miskas configuration for the boost control seems to work. I'll test it when I've fixed the leaking hose.
08.04.03. Have fixed the leaking hose and now the boost is fine when I use open loop for boost-control. With closed loop the boost was very instable. The boost pwm table for closed loop was messed up, just need to fix the table with the values that worked in open loop. The quick response in boost impresses me, full boost comes much quicker now compared to my original 280 hp chip-tuned ECU.
Software configuration
I used 1.1.27, it is the latest stable version to use (as of 2008-03-12). The tables are 12x12, which seems more stable and gives good control over this very easy to tune engine (stock cams).
With some documentation I hope this can be pre-loaded in the pnp Audi boxes delivered.
Latest config 2008-05-06
- Stock engine tuned to get most power
- Changed ignition map to get higher advance and more power
- Cold start needs tuning
- Runs well for daily driving
- Open loop boost control works ok, closed loop not so ok
Config 2008-04-22
- For a stock engine
- Cold start needs tuning
- Overall runs well for daily driving, but not tuned for max power
- Open loop boost control works ok, closed loop not so ok
- Idle air control valve works adequately
I made up a start configuration from various sources :
- I have config/tables from Jörgen:
- An MSQ from an RS2 from one of the Finnish guys:
- The lambda table uses AFR (In my opinion wrong) and the spark map seems to use (too) high advance on load.
- Miska Peippo sent an MSQ for AAN using firmware 1.1.27:
- Very nice config with boost control and idle air valve control
- One must use a special vemsv3.ini to get control of the special boost control settings that Miska has set up.
Deviations
In the majority of installations it's very probable that the stock IAT sensor which is of PTC type will be replaced by the web shop IAT that uses standard NTC type. This requires changing the on-board pull-up on the analog input for the IAT back to the standard 2.7K.
This makes the installation less pnp but everyone seems to agree that the stock PTC can be replaced with favourable gains in response and accuracy.
The stock PTC sensor is used for now, but will be changed when the engine is upgraded (intercooler, turbo, exhaust manifold).
Wiki links to Audi information
PlugAndPlayMotronic
VemsAudiAan
MembersPage/MiskaPeippo/AudiSSix
MembersPage/JorgenKarlsson/AudiStwo
MembersPage/TeppoKalske
MembersPage/MarcellGal/PowerAndTraction/PnpHarness
MembersPage/MarcellGal/PowerAndTraction/IdleAir
MembersPage/MarcellGal/PowerAndTraction/BoostControl