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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