Link G4 P&P USA STI ECU Testing is Complete!-

FLI and Link ECU has finished testing the US STI plug & play G4 Xtreme ECU with success last week. The two model years tested were 2006 and 2007 Subaru STI cars.   All testing was done in FLI’s dyno room. The final plug & play kit will include a G4 Xtreme ECU, an adapter board (either for 2004-06 or 2007) and a adapter harness.  The final product will most likely be released in August, 2009.   FLI will provide an official release then.

Notes from Testing:

The G4 ECU can control all the factory ECU sensors/actuators including the Tumble Generator Valves for cold starts. The Electronic throttle can be spanned and adjusted which makes a big difference especially on the 2007 STI. There will be 3 maps (ignition, fuel and boost) that can be either internally changed by certain conditions (that the user/tuner sets with switch logic) or by a mechanical switch that will have to be wired in. You can also control 8 fuel injectors safely and wire in a wide band O2 sensor(innovate LC1, Zeitronix, AEM, etc.) from the adapter board by an auxiliary plug which cuts down on installation time.

Overall, the testing went well and here are some dyno sheets on the two cars that were tested on:

2006 “Recipe for Power” STI-

Baseline Info 100 Octane + Methanol (Hydra 2.5 EMS):

Sae is off, temp in room is 75 degrees with 42% humidity, IAT is 85 degrees, max boost of  22 psi.  Mods:  FLI closed deck block, FLI CNC PP heads, Aquamist HFS-5 Meth/H20 kit, Cosworth Cams, GT35R turbo, FLI RFMIC, PE 850cc injectors, APS header/ up pipe, APS 3.5 inch TBE, APS 85mm Rotated mount CAI and a Hydra 2.5 EMS.

Test Info 100 Octane + Methanol (Link G4 ECU):

Sae is on, temp in room is 77 degrees with 32% humidity, IAT is around 85 degrees, max boost of  22 psi.  Mods:  FLI closed deck block, FLI CNC PP heads, Aquamist HFS-5 Meth/H20 kit, Cosworth Cams, GT35R turbo, FLI RFMIC, PE 850cc injectors, APS header/ up pipe, APS 3.5 inch TBE, APS 85mm Rotated mount CAI and a Link G4 ECU.

2007 “Jekyll and Hyde” STI Limited (full article soon to come)-

Baseline Info 91 Octane + Methanol/H20 (Stock ECU with Protune):

Sae is on, temp in room is 90 degrees with 30 % humidity.  Max boost of 22 psi tapering to 20 psi.  Mods:  Blouch 3.0 R BB, APS 725 FMIC, APS 70mm CAI, APS header/up pipe, Cobb TBE catless, Cobb V2 AP, PE 850 cc injectors, Walbro 255 m/l ph fuel pump, Alky Control Methanol/H20 kit  and V2 AP.

Test Info Info 91 Octane + Methanol/H20 (Link G4 ECU):

Sae is on, temp in room is 79 degrees with 42 % humidity.  Max boost of 21 psi tapering to 19 psi.  Mods:  Blouch 3.0 R BB, APS 725 FMIC, APS 70mm CAI, APS header/up pipe, Cobb TBE catless, Cobb V2 AP, PE 850 cc injectors, Walbro 255 m/l ph fuel pump, Alky Control Methanol/H20 kit  and V2 AP.

Methanol/H20 System advantages for the new G4 Link ECU:

The Link ECU can control the methanol/h20 spray in a 3d map by either using manifold air pressure (boost) or fuel injector duty cycle as load sites.  There are other options as well like coolant temp, intake air temp, etc.   his works extremely well and to compare, the Aquamist HFS-5 and 6 kits comes with Fuel Injector Amplifier controller which controls the  spray percentage with a 1:1 linear ratio to match the fuel injector duty cycle.

The Link ECU also can be wired to automatically to change to a different timing, fuel and boost map (3 total) if the ECU detects a clog in the methanol line (by a pressure sensor) or activated by a mechanical 3 way switch.  This ensures that a fail safe map will automatically be activated if the ECU detects a problem.

FLI will release updates as soon as we get them. FLI is extremely excited to offer this very powerful ECU to the Subaru community here in the US.

FAQ-

Q:  Can I place an order for one now?

A:  Not yet, but FLI will be taking pre orders 2 weeks before the official release.

Q:  When is the ECU going to be released?

A:  Around August 2009.

Q:  Will the G4 Xtreme control  a wide band O2 sensor?

A:  There will be a 4 wire plug that comes off the adapter board that will be used for an LC1, Zeitroix, AEM, etc wide band O2 sensor and there controller.  The Link ECU does not control the sensor, but does take in the signal from the controller.