Below we have a graph from a custom tune on a 2005 Subaru STi that was very healthy and with simple mods made a good amount of power. Typically we would expect around 275WHP for this car but this one ended up at around 287WHP which is very solid for the older VF39 turbo on this car. Having a well maintained and healthy engine makes a world of difference when it comes to making power on any platform.
Event: Dyno Tune
Location: Touge Tuning, Mississauga Ontario
Elevation: 249 ft.
Car: 2005 Subaru WRX STi
Tuner: Sasha from OnPoint Dyno
Dyno Info: Dynapack
Peak HP at RPM: 287 @ 5400RPM – SAE J1349 (2004) Corrected –
Peak Torque at RPM: 320 @ 3400RPM – SAE J1349 (2004) Corrected
Baseline HP/TQ for Stock 2010 STi on same dyno: 228WHP/240WTQ
Target Boost: 18PSI
Fuel: Petro 94
-OnPoint Dyno Custom Tune
-Catted Turbo-Back Exhaust