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correct placement of rear O2 sensor on custom catted y-pipe

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Old Aug 6, 2005 | 10:54 AM
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Default correct placement of rear O2 sensor on custom catted y-pipe
I mite be making a custom Y-pipe / cats how do you know where to weld in the rear o2 bung.


I've heard that it needs to be exactly (unknow # for now) from the center of the converter. and correctly placed within (unknow #) from the front o2 sensor

most likely will be using a 16 inch overall lenght converter and 12 inchs of catalicytic core

trying to save the cost of rear o2 sims kindof like the supermax exhasut sys. by dynotech.

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Old Aug 6, 2005 | 10:58 AM
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Default wide band O2 sensor placement for tuning
after all my bolt on mods and cam are installed do'es the tuner need a wide band rear O2 sensor bund to plug into?

I'll be using a custom catted Y-pipe currently without any rear sensors

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Old Aug 6, 2005 | 11:02 AM
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why dont u just use sims? i got mine for 50 bucks used
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Old Aug 6, 2005 | 11:17 AM
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the best place to put the wideband would be in front of the cats. (weld a bung somewhere before the cats)
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Old Aug 6, 2005 | 11:18 AM
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Originally Posted by Grimes
the best place to put the wideband would be in front of the cats. (weld a bung somewhere before the cats)
Wouldn't you then only be reading one cylinder bank?
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Old Aug 6, 2005 | 11:20 AM
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yeah you would be only reading one bank, true. but the cats will throw the reading off anyway if you go after them
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Old Aug 6, 2005 | 11:25 AM
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Originally Posted by Grimes
yeah you would be only reading one bank, true. but the cats will throw the reading off anyway if you go after them
I don't really know anything about tuning, are you supposed to use 2 widebands or what?
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Old Aug 6, 2005 | 11:36 AM
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WB before cats. you can run 2 WB's if you want, but it's not 100% necessary
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Old Aug 6, 2005 | 11:39 AM
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You can't really tune individual banks, so it makes no difference anyway. Place it before the cats between 10 o 'clock and 2 o 'clock.
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Old Aug 6, 2005 | 11:52 AM
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Originally Posted by co.6z28
why dont u just use sims? i got mine for 50 bucks used
The cost of rear o2's > sims.
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