fluid dynamics, venturi effect, and oxygen sensors. - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

EZWood · 10-24-2012, 06:46 PM

I have a catless header and my downstream oxygen sensor has a spacer with a 90 degree bend. Anyone have any idea the angle in which the 90 should be facing in regards to the flow of exhaust gas that would decrease the reading on the oxygen sensor? Thanks

serialk11r · 10-24-2012, 07:37 PM

What do you mean "decrease the reading on the oxygen sensor"?

mike2100 · 10-24-2012, 08:51 PM

Got a picture of the spacer?
If it's what I'm picturing in my head, the orientation shouldn't matter. Venturi doesn't apply because there's no way for air that is outside the exhaust stream to enter the exhaust stream (except via the engine).

OrbitalEllipses · 10-24-2012, 09:05 PM

On my WRX I just used two spark plug anti-foulers screwed into each other; one was drilled out to make room for the O2 sensor. Stock placement worked fine, never got a code.

*KID* · 10-24-2012, 09:54 PM

I think you mean to put a fouler?

soros151 · 10-25-2012, 12:09 AM

Wow... I had forgotten about this. Foulers... to think that we still need this.

OrbitalEllipses · 10-25-2012, 12:44 AM

Whatever they are you got the idea.

EZWood · 10-25-2012, 01:42 AM

I can take a picture tomorrow.

mike2100 · 10-25-2012, 06:21 AM

http://www.autozone.com/autozone/acc...er=730544_0_0_

anti fouler or non fouler is correct; they keep spark plugs from fouling due to failed rings

10-24-2012, 06:46 PM	#1
EZWood BAMF Join Date: Jun 2012 Drives: 13 fr-s, whiteout, MT. 94 ZJ Location: Apache Junction, Az Posts: 1,007 Thanks: 209 Thanked 345 Times in 215 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	fluid dynamics, venturi effect, and oxygen sensors. I have a catless header and my downstream oxygen sensor has a spacer with a 90 degree bend. Anyone have any idea the angle in which the 90 should be facing in regards to the flow of exhaust gas that would decrease the reading on the oxygen sensor? Thanks

10-24-2012, 09:54 PM	#5
KID 86-er Join Date: May 2012 Drives: BRZ tS Location: Laredo, TX Posts: 970 Thanks: 195 Thanked 253 Times in 175 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	I think you mean to put a fouler? __________________ 2018 Subaru BRZ ts 020/500 - My Daily, work car, and track car

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10-24-2012, 09:05 PM	#4
OrbitalEllipses Banned Join Date: Jan 2012 Drives: Attitude Location: MD Posts: 10,046 Thanks: 884 Thanked 4,889 Times in 2,902 Posts Mentioned: 123 Post(s) Tagged: 4 Thread(s)	On my WRX I just used two spark plug anti-foulers screwed into each other; one was drilled out to make room for the O2 sensor. Stock placement worked fine, never got a code.

10-25-2012, 12:44 AM	#7
OrbitalEllipses Banned Join Date: Jan 2012 Drives: Attitude Location: MD Posts: 10,046 Thanks: 884 Thanked 4,889 Times in 2,902 Posts Mentioned: 123 Post(s) Tagged: 4 Thread(s)	Whatever they are you got the idea.

10-25-2012, 01:42 AM	#8
EZWood BAMF Join Date: Jun 2012 Drives: 13 fr-s, whiteout, MT. 94 ZJ Location: Apache Junction, Az Posts: 1,007 Thanks: 209 Thanked 345 Times in 215 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	I can take a picture tomorrow.

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