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10-14-2020, 08:20 AM | #1 |
Scooby Newbie
Member#: 470383
Join Date: Jul 2017
Chapter/Region:
International
Location: Argentina
Vehicle:2002 Forester S-Turb Grey |
AFR problem on WOT
Hi. I have a Forester SF5 MY02 and I have an AFR problem
When idle or cruising, the AFR is good (14.3-14.7). But by stepping on the accelerator more than 50% to WOT, the AFR goes lean (15 to 18, and then down to 13). Its a closed loop / open loop transition problem? Setup: Testes1010 stage 2 map Turbo swap to TD04 Forged pistons (NPR rings) Forged H-Beam rods Stock 5mt trans. (4.444) Stock 440cc injectors Walbro 255 w/ hard wire (14v~) Spark plugs NGK Iridium BKR7EIX 5mm Phenolic Spacer Stock intercooler 11mm phill restrictor Stock inlet Stock filter box Stock Y pipe Prosport Wideband sensor locate on downpipe, 5cms after flange). Checked: -Fuel pressure after Fuel Filter (42~ psi idling, to 50-54~ psi when thortle open) -NGK Iridium BKR7EIX (gap 0.075mm) -Battery Voltage OK (13.9~14.2) -Grown OK -MAF OK Suspicion: -Bad fuel filter? -Bad fuel pump filter? -I see a little perspiration on two injectors -Bad fuel rail FPR? -Bad fuel return line FPR? -While the car is on idle, being outside the gasoline pump is heard loudly, like a whistle any help?
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10-16-2020, 11:52 AM | #2 |
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region:
SCIC
Location: Orange County CA
Vehicle:2004 WRX wagon silver |
had it done it since the tune?
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02-12-2021, 12:23 PM | #3 |
Scooby Newbie
Member#: 470383
Join Date: Jul 2017
Chapter/Region:
International
Location: Argentina
Vehicle:2002 Forester S-Turb Grey |
I keep having issues with the AFR in WOT. Could it be that the injectors are small? I'm using the ones that came in the Forester, according to the specifications, they are 565cc (they are Denso, it says 3920, up 27, and at the base where the plug 19 goes)
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02-13-2021, 10:17 AM | #4 |
Scooby Specialist
Member#: 283429
Join Date: May 2011
Chapter/Region:
South East
Location: Down yonder.
Vehicle:2016 Fuji Sunfire 03 Silver |
So WOT is open loop, meaning it is running on a programmed map for fuel delivery.
If you are using an off-the-shelf tune I would recommend visiting a tuner before I threw more money at parts-swapping. |
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