Audi S2 / RS2 standalone ECUs
Audi's early-1990s quattro performance models with the 2.2-litre turbo five-cylinder; the RS2 Avant was developed with Porsche.
- Chassis
- B4
- Years
- 1991–1997
- Engines
- 3B 2.2 20V turbo · ABY 2.2 20V turbo · ADU 2.2 20V turbo · 2.2 20V turbo 3B/AAN/ABY
- Layout
- 5-cylinder, AWD
You have 10 plug-in ECU options for the Audi S2 / RS2 from MaxxECU and ECUMaster. The cheapest complete setup is ECUMaster at US$1,238 including the ECU. 55 wire-in ECUs can also run its 5-cylinder engine with a custom loom, from US$275.
Prices checked and include the ECU.
Your options for this car
New to this? Three ways to fit an aftermarket ECU explains each one in five minutes.
Dedicated plug-in 0
Built for this car. Goes where the factory ECU was and plugs straight into the factory loom.
None listed for this car.
Standalone + adapter harness 10
A general-purpose ECU with an off-the-shelf harness that joins it to the factory ECU plug.
From US$1,238 →
Wire-in ECU 55
Any ECU with the right features, on a new or rewired loom. Best for race cars, swaps and big changes from factory.
From US$275 plus loom →
Reflash
Keep the factory ECU and rewrite its tune. Usually the cheapest, keeps every factory feature, but limited to what the factory hardware can control.
Reflash options for this car are still being checked.
Plug-in ECUs for the Audi S2 / RS2
10 options, cheapest first. Each one links to its full specs and sellers.
Audi S2 (3B) MaxxECU STREET Plugin EXTRA
Typ 89; Complete kit: MaxxECU unit + plug-in adapter + LSU 4.2 wideband + accessories (EXTRA)
Audi S2 / S4 / S6 (AAN, ADU, ABY) MaxxECU STREET Plugin EXTRA
Typ 89; Complete kit: MaxxECU unit + plug-in adapter + LSU 4.2 wideband + accessories (EXTRA) Avant; Complete kit: MaxxECU unit + plug-in adapter + LSU 4.2 wideband + accessories (EXTRA)
Audi S2 (3B) MaxxECU RACE Plugin STANDARD
Typ 89; Kit: MaxxECU unit + plug-in adapter, no wideband sensor (STANDARD)
Audi S2 / S4 / S6 (AAN, ADU, ABY) MaxxECU RACE Plugin STANDARD
Typ 89; Kit: MaxxECU unit + plug-in adapter, no wideband sensor (STANDARD) Avant; Kit: MaxxECU unit + plug-in adapter, no wideband sensor (STANDARD)
Audi S2 (3B) MaxxECU RACE Plugin EXTRA
Typ 89; Complete kit: MaxxECU unit + plug-in adapter + LSU 4.2 wideband + accessories (EXTRA)
Audi S2 / S4 / S6 (AAN, ADU, ABY) MaxxECU RACE Plugin EXTRA
Typ 89; Complete kit: MaxxECU unit + plug-in adapter + LSU 4.2 wideband + accessories (EXTRA) Avant; Complete kit: MaxxECU unit + plug-in adapter + LSU 4.2 wideband + accessories (EXTRA)
MaxxECU Plugin adapter - Audi AAN
Typ 89; Adapter harness only; MaxxECU unit sold separately Avant; Adapter harness only; MaxxECU unit sold separately
MaxxECU STREET/RACE Plugin adapter - Audi 3B
Typ 89; Adapter harness only; MaxxECU unit sold separately
No plug-in is listed for that chassis and year. A wire-in ECU below will still fit with a custom loom.
Wire-in ECUs that can run this engine
Cheapest current unit from each brand with at least 5 injector and ignition outputs, so it runs fully sequential.
Add a loom: built by your tuner or a loom maker. Filter every wire-in ECU by features and price
Find a tuner for these ECUs
Shops with their own dyno that tune the brands above.
About the makers: MaxxECU · ECUMaster