Stock Fuel Pump vs Aftermarket Fuel Pump (Walbro) Test - AFR Comparison :: Subaru Impreza WRX STi

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In previous videos you could see that my AFR leans out the hole time at higher load and rpm. Now I changed the fuel pump to the Walbro 255 and compared the AFR measurements with the old logdata and stock fuel pump. Small change with big impact!

Video-Chapters:
00:00 : Intro
00:08 : Stock Fuel Pump @ 1.15 bar, 4th gear
00:25 : Walbro 255 Fuel Pump @ 1.15 bar, 4th gear
00:50 : Stock vs Walbro 255 Fuel Pump @ 1.15 bar, 4th gear - Direct Comparison
01:08 : Stock Fuel Pump @ 1.30 bar, 4th gear
01:25 : Walbro 255 Fuel Pump @ 1.30 bar, 4th gear
01:40 : Stock vs Walbro 255 Fuel Pump @ 1.30 bar, 4th gear - Direct Comparison
01:56 : Stock Fuel Pump @ 1.30 bar, gears trough
02:10 : Walbro 255 Fuel Pump @ 1.30 bar, gears trough

Car Specs:
TD05-20G (China)
Maxspeed Turbo-Back Exhaust System with 200 Cell Cat
ECU is tuned (LC) + Boost controlled with EVC Boost Controller IV (1.1-1.2 bar in this video)
STi GeNome Defi gauges
AEM Wideband Failsafe AFR Gauge
Walbro 255 Fuel Pump (with stock injectors)
Unequal Length Header (original)
Stock EJ207

Data Logging Parameters (logged with RomRaider from ECU):
Mass Airflow (Graph red)
Manifold Relative Pressure / Boost (Graph blue)
Engine Speed
Engine Load
Ignition Total Timing
Feedback Knock Correction
Fine Knock Correction
Intake Air Temperature
Throttel Opening Angle
Injector Duty Cycle
Vehicle Speed

Recorded with a GoPro Hero HD 1
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More videos come!