RallySport Direct GTX3076 2011 STi

Event: Dyno Tune/ Product Testing
Location: ZipTie Dynoworks, Salt Lake City Utah.
Ambient Temp: 75-80F
Ambient Pressure 12.7psi/ 86kPA
Elevation: 4600ft
Weather: Sunny

Car: 2011 STi
Tuner: Christian of Cobb Tuning
Dyno Info: Mustang
Transmission: 6spd
Gear: 4th
Peak HP at RPM 91 Octane : 335WHP @ 5600RPM. Corrected
Peak Torque at RPM 91 Octane: 337WTQ @ 4600RPM Corrected

Peak HP at RPM 104 Octane: 382WHP @ 5600RPM. Corrected
Peak Torque at RPM 104 Octane: 382WTQ @ 4600RPM Corrected

Baseline hp/tq for a stock on same dyno: Stg2 2011 STi 262HP and 286TQ.
Target Boost: S# on Pump Gas 22PSi, S# on Race Gas 25PSi
Target AFR: 10.8-11.4 depending on the fuel
Fuel: 91octane with 10% ethanol, Sunoco GT104 unleaded.

 

Engine/Power Modifications:

Cobb Tuning AccessPort
Cobb Tuning Down Pipe
Cobb Tuning Heat Shield
Invidia Q300 Ti Tip Catback
Samco Radiator Hose Kit
Koyo Aluminum Racing Radiator
Omni Power 4 Bar MAP Sensor
Injector Dynamic 1000cc TopFeed Injectors
DeatschWerks 300lph Fuel Pump
Process West Top Mount Intercooler
Tomei Fuel Pressure Regulator Type-S
Tomei Fuel Pressure Gauge
ATP GTX3076 Turbo
Tomei Expreme Unequal Length Exhaust Manifold
GrimmSpeed Air Oil Separator
GrimmSpeed Manual Boost Controller
GrimmSpeed Electronic Boost Controller
GrimmSpeed External Waste Gate Bracket
AMR Performance Cast Turbo Inlet
GTSpec 44mm V-Band 3-Bolt External Wastegate Uppipe
TurboSmart Duel Port Blow Off Valve
Turbosmart Hyper-Gate45 Wastegate
Prova Radiator Cap

Drivetrain:

MODE RACING Double Adjustable Short Shifter
Kartboy Shifter Bushings (Front/Rear)
PST Carbon Fiber Driveshaft

 

91 Octane Vs Stage 2

104 Vs Stage 2

GT104 S# vs 91 S vs 91S#

Conclusion from our Test:
Starting off from where we left off on our 2011 STi sedan.
After finishing product testing on the Tomei Arms M7960 it was time to test out another turbo. We chose to go with the brand new state of the art GTX billet wheel technology from Garrett, and use the ATP GTX3076R Stock location turbo.

The goal for this stage of the build was to really maximize and fully utilize the stock components along with having a very fun and efficient car that was realistic for someone to drive on the street, track or drag. This turbo would be the perfect match for anyone who is trying to get the most out of a stock motor, have quick response, and have one wicked car.

To put everything out on the table, we really feel as though we were maximizing several key components on the car, the motor, and clutch is still 100% stock. The Process West intercooler was getting close to its peak efficiency, the turbo was running at 25Psi, and given the octane of fuel we were getting close to the peak stability point of both fuels that where being used. The amazing thing is just how fast this turbo spools, looking at both race and pump gas you can see that compared to the stock VF48 the increase in lag is quite minimal for the huge gain in performance. Also given the altitude of 4200ft this turbo, compared to sea level it would be able to easily produce over 400WHP at similar conditions due to the increased air density.

The power delivery on the vehicle is very smooth and predictable, given the high efficiency TMIC the lag is kept to a minimal and the throttle is very responsive. The vehicle very easy to drive, quick, fun, and overall a simple build utilizing quality bolt on components from proven manufactures ensuring that everything is running at a safe and optimal level.

Huge thanks to the following manufacturers:


Cobb Tuning
Tomei
GrimmSpeed
ProcessWest
Cosworth
Turbosmart

1 Comments

  1. zizuxsays:

    Nice work, although your reference vs a Stage II 2011 STi seems off. My stage 2 STi did 280 hp and 340 tq.

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