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Old 03-12-2004, 10:28 AM   #1
Richard Sierra
Scooby Newbie
 
Member#: 29528
Join Date: Nov 2002
Location: Indiana
Vehicle:
02 WRX wagon V7 RA
-C conversion

Default Wideband o2 sensor placement, tuning experts please help!

I was on the dyno yesterday and was getting some funky o2 numbers from the dyna pak wide band. I have two bungs, one is approx 6-8 inches from the turbo in the downpipe, the other is close to the rear o2 sensor location. I have an external wastegate that is downstream of the "first" o2 bung

We had the dyna pak wideband in the downpipe close to the turbo and my LM-1 Innovate wide band in the further downsteam bung.

The dyna pack reading showed very lean conditions under full load (above 12.5:1) yet the LM-1 showed pretty stable readings around 11.5:1. We swapped the dyna pak wideband to a new one and it still showed the same lean conditions.

The car never detonated on 93 even with the alleged lean condition. We were running 21-22 psi boost.

Is the wideband too close to the turbo and overheating causing funky numbers or does the downstream wastegate possibly affect AF readings?

The other intersesting thing is at a stable load and boost the AF's stayed constant.

I have an V7 Ra motor with a GT30-11, a Perrin big MAF, Walbro pump, stock fuel rails and PE 800's.
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