Numbers
Dyno: YimiSport Dynojet
Tuner: Paul Leung
Wheel HP: 312 AWHP
Wheel TQ: 361 Ft-Lbs.
Ambient Temp: 70 degF, 50% humidity
Elevation: 1200 ft
Car Info - Rufus' 2015 Launch Edition Journal
Year: 2015 STi Launch Edition
Engine Management: Cobb AccessPort
Fuel: 91 octane California blend
Boost: 19.5 psi peak tapering to 14 psi
AFR: low 11 range
Turbo: OEM VF48 - ported, polished and ceramic coated by SoCal Porting
Intercooler: Grimmspeed black
Injectors: Cobb ID 1000cc, Cobb FPR and fuel pump
Intake/Inlet: Cobb Short Ram and turbo inlet tube
Headers: KillerB 4-1, Swaintech coated
Uppipe: KillerB, Swaintech coated
Downpipe: Grimmspeed Limited, high-flow cat, coated
CBE: Cobb
Other Power Mods: Cobb 3-port EBCS, Bypass Valve, Perrin AOS to be swapped for IAG soon.
Notes:
Took my car to Paul to tune all the bits above that I installed myself for the most part. He did not do a baseline pull because he saw a nasty lean spot low in the RPM range, either from the fuel pressure regulator, headers or both. After spending a fair amount of time discussing my goals and usage, he tuned for a moderately aggressive street tune with the understanding that when I take the car for track days that I fill with 100 octane for safety and longevity. The throttle is now set for 100% linear travel and max power in S mode on the SI drive, with 15% more aggressive mapping on S#. I mode is now 15psi target with 15% less aggressive throttle mapping for hot days and more leisurely driving. The car spent a lot of time on the dyno, then Paul took it for a half hour drive to ensure the car was happy on the road. His AFR sensor reads a little high and add the high flow cat to the mix and the AFRs should really be in the low 11 range, not 12 listed on the chart. Paul's opinion is that this is an "above average" stock turbo STi.
Butt dyno says that the car is far stronger and smoother than the off the shelf Cobb maps. There is far more of a push-you-in-the-seat feeling than before, and power feels like it carries into the high RPMs much better than on the intake and turbo-back alone. Boost response is far more rapid than before. The turbo spools up now compared to a turbo back on the same level as going from stock to a turbo back. When I want boost and I want it now, the car delivers. It makes significant thrust from 2500rpm now, with boost already developing at 2000rpm.
Very pleased with the car and yesterday's results. Fulfilled my curiosity of what a "maxed out stock turbo" build would be, short of TGV deletes or E85 fueling.
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