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Old 10-30-2011, 02:40 PM   #1
Zach Bitzer
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Member#: 243654
Join Date: Apr 2010
Location: Whatever Bye.
Vehicle:
2001 s4 Avant
Flatbed Black

Default Accessport maxing out my injectors?

2005 Stage 2 WRX Wagon. Turboback exhaust and intake. No cats. After some data logging, we saw I'm maxing out my stock injectors on a off the shelf stage 2 tune.

Is this correct?

Also, do I actually have a wideband sensor? Or is the accesport logger just a sham when it comes to reading my air/fuel ratio?

I'm getting injectors and a fuel pump next week. Getting some 800cc's for cheap, and I'm just going to mod mine and sell the others. Just wondering if anyone else had the same problems.

I did a little searching, but most others had more mods than me.

Thanks.
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Old 10-30-2011, 09:36 PM   #2
I8ls1
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Chapter/Region: TXIC
Location: Katy, Tx
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2005 wrx
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be careful with the cheap injectors you can mod you stock ones to get you plenty of flow. i have 05 2.0 with 16g and running the accessport 16g tune and it doesnt matter if i set my boost to 14 or 19 psi it will say my injectors are 100%. as far as the wideband no you dont have one and the accesport a/f reading isnt very accurate at low readings
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Old 10-31-2011, 10:21 AM   #3
Cobb Tuning
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Quote:
Originally Posted by Zach Bitzer View Post
2005 Stage 2 WRX Wagon. Turboback exhaust and intake. No cats. After some data logging, we saw I'm maxing out my stock injectors on a off the shelf stage 2 tune.

Is this correct?

Also, do I actually have a wideband sensor? Or is the accesport logger just a sham when it comes to reading my air/fuel ratio?

I'm getting injectors and a fuel pump next week. Getting some 800cc's for cheap, and I'm just going to mod mine and sell the others. Just wondering if anyone else had the same problems.

I did a little searching, but most others had more mods than me.

Thanks.
You can look at injector duty cycle to see where you sit, but keep in mind that approaching 100% (or tad over) is not unusual for stage 2 Subarus with a conservative OTS fuel map. Anything above stage 2 (or stage 1/2 or above with E85) will require larger aftermarket injectors. You do not need aftermarket injectors for stage 2 running E0-E10 gas.

The AccessPORT uses the front o2 sensor to read AFR. On the 02-05 WRX it is a narrowband sensor and it is generally only accurate in closed loop (idle/cruise). Even if it were a wideband (like the 2.5L cars), its placement in the exhaust doesn't make it very accurate under boost and the ECU limits the reading to 11:1. Regardless of the Subaru, you need a wideband o2 sensor to accurately determine fueling in open loop.

Bill
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Old 10-31-2011, 12:17 PM   #4
Zach Bitzer
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Location: Whatever Bye.
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2001 s4 Avant
Flatbed Black

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Thanks for response
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