create a site for free

ecu-GN from TurboTweak

Stand-Alone Plug-in ECU for 1984-1987 turbo Buick
and 1989 Pontiac Turbo TA

  • Plugs into the factory harness
  • Gives you complete control of tuning
  • Based on the proven MS3Pro core and uses TunerStudio for tuning (license for TunerStudio MS Ultra included)
  • Built in 4 bar MAP sensor
  • Built in wideband O2 controller, comes with sensor and cable (bosch 4.9), starts wideband sensor heater only after engine start for improved life
  • Operates high or low impedance injectors
  • Use the stock ignition. Can use newer coilpacks or coil per plug with proper wiring.
  • On-board automatic datalogging
  • 2nd Built-in CPU with CAN communication and expanded Inputs/Outputs (10 analog inputs)
  • Flexfuel, Traction Control, Boost Control, Launch Control, Water/Meth Injection, antitheft, and much more!
  • Compatible with existing Scanmaster 2.2 or Scanmaster G gauge! (for SM 2.1, an upgrade chip can be supplied)

Frequently Asked Questions

It is a complete stand-alone aftermarket ECU that replaces your original ECU. It turns complete control of tuning over to you (or your tuner).  You should be proficient in tuning or have someone that can tune, to use this device.

It comes with everything you need and plugs into the original harness. For the 84/85 cars, you'll need to add an airtemp sensor.

No, absolutely not! Many people have gone really fast with the factory original ECU. The ecu-GN can make it much easier though, with all its built in features, and advanced datalogging. There are also many safety features to help save your engine in case of low fuel pressure, low oil pressure, over-boost, lean AFR, etc. (those sensors need to be connected)

The cost is $1899, and the ecu-GN is currently in production. This is a small market, so these are made in smaller batches. If we happen to be out of stock, the next batch is most likely close behind (about 6 weeks)

Complete Feature List

In the box: 

WB O2 sensor, cable, bung
USB communication cable
Software – TunerStudio Ultra included with custom screens
Startup tune

1984-1987 Buick Turbo Regals, Grand Nationals, & 1989 Pontiac Turbo Trans Am
Plugs directly into the stock ECM harness and location
Integrated 4-Bar MAP sensor, and full time barometric pressure sensor
Integrated digital wideband oxygen sensor controller, sensor and bung included (Bosch 4.9) 
 -communicates digitally to eliminate ground offsets and inaccuracies
Peak/Hold injector drivers for low or high impedance injectors
Sequential Injection (or semi-sequential, bank to bank if desired)
Controls stock Buick ignition, newer coilpacks, or coil per plug
Datastream output compatible with existing Scanmaster devices
Bluetooth or WIFI wireless capability (WIFI standard)
CNC Billet Aluminum Case
LED Indicators on case for troubleshooting
Easy connection terminal strip built in for expansion sensors
Expansion connector for optional harness (coil per plug, etc)
nused terminals in the stock harness are re-assigned for new input/output
Compatible with Caspers fuel/oil pressure sensor kit through EGR plug 

Speed density, VE based tuning (optional blending with Alpha-N, or MAF if desired)
Wideband O2 closed loop correction
Autotune feature (live or from log files) and long term fuel correction (adaptive)
Use original knock filter (ESC), or onboard knock processor
Per cylinder fuel injector correction
Per cylinder ignition timing correction
Flex Fuel Capability
Table switching
Internal automatic datalogging with 8GB SD card (or bigger), and external logging with laptop
Onboard real time clock, logs have proper date and time
2-Step or 3-Step limiting (not with stock ignition module)
Traction control
Boost control (internal and external gates with CO2)
Nitrous control
Water/Alcohol injection control
Transbrake control
Fuel pump speed control
Many engine safety controls
Fuel pressure compensation
Built-in Optional Antitheft

Standard Inputs: 
Crank (VR, Hall Effect, or Optical)
Cam (VR, Hall Effect, or Optical)
Barometric pressure (separate full time)
A/C Request
Park/Neutral switch
3rd gear and 4th gear from transmission
Oxygen sensor (built in wideband)
VSS mph (VR conditioned)

Extra Unused Inputs: 
10 Analog 0-5v inputs
1 Frequency input for Flexfuel sensor (or MAF)
1 Frequency input for auxiliary VSS (VR conditioned) – for traction control
3 Digital (on/off) inputs, ground switched

Standard Outputs: 
6 Peak/Hold Injectors – 4 amp
6 Ignition outputs for coil per plug, or stock ignition or aftermarket coilpack
Fuel pump output (can do PWM speed control with solid state relay)
Idle control (IAC) stepper output (operates in closed loop like stock, or open loop)
Torque converter clutch (TCC) output (controlled by MPH, gear, load, TPS)
Air conditioning clutch control (ACC) (controlled by TPS, MPH, RPM, add IAC steps)
Canister purge control (currently configured as an optional output)
Wastegate solenoid control (closed loop or open loop, MPH or gear)
Radiator Fan control (controlled by MPH, TPS, coolant temp, add IAC steps)
Tachometer output
Service engine soon light
Wideband O2 diagnostic LED on case

Extra Unused Outputs: 
Many outputs are configurable as on/off or pulsewidth modulated (PWM)
4 high current outputs (5amp, on/off or PWM), ground switched
2 PWM medium current outputs (3amp, on/off or PWM), ground switched


3567 Purcell Rd.                    
Salem, IL 62881


Email: [email protected]
Phone: 618-548-5953