anyone here using a wideband o2 on a GS4? where did you put the o2 sensor?
from what i have read they should be close to header. do we need two or is one good down where the Y pipe is? any feed back would help.

 

Dont know but Im curious too.What wideband are you using?

 

If you want to run just one Wideband (what I would do) I would mount it near one of the collectors on either bank. It will only read from the bank of the collector you are mounting it near but this should be fine (both banks will be in the same general A/F reading). If you are running a FI setup than you *may* want to run a sensor on each downpipe close to the exhaust of the turbo's to help monitor for any fuel issues (just for safety) as boost + lack of fuel could lead to a blown motor.

 

non FI gs4 runnig widebands?

 

See above..This part is for Na. The other part "If you are running an FI setup....." is for turbo.