projectPSI

I ahve a 97 integra ls obd2 and i converted it to obd1 so i can run hondata s100b. Im getting my exaust on and i need to know if i need bothe the o2 senors or just one. If one which one and what do i do with the other one? Or do both have to stay in?

vtec.dc2

you only need one.. keep the other one on the side.. i had one of them go bad already, so i'm running on second sensor.

projectPSI

Which one do you keep? The one closer to manifold? Do u just unplug the second one?

vtec.dc2

i'm not 100% sure.. but i think it was primary, not the one on the cat.

projectPSI

Anyone else wanna back that up for me? I need to know for sure which o2 sensor to keep.

DaX

iTrader: (1)

Keep the sensor that is before the catalytic converter in the manifold. I had two o2 bungs installed in my downpipe though...one for the primary o2 sensor, and one for a wideband o2 sensor for tuning, that i have a block off bolt in when it's not being tuned.

projectPSI

Do you need 2 for tuning?

DaX

iTrader: (1)

One bung for your OEM o2 sensor for the ECU to read from, and one bung for the wideband to tune from. When going to get tuned, most shops around here charge you to weld on a second o2 bung if you don't already have one.

-Trinitron-

just unplug the one in the cat. You will need an extra bung (preferrably in an easily accessable location) for tuning.

PM-Performance

you dont need an extra bung for tuning , unplug the stock one and put it in the primary hole. thats what ive been doing for years now.

DaX

iTrader: (1)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr206 &raquo;</TD></TR><TR><TD CLASS="quote">you dont need an extra bung for tuning , unplug the stock one and put it in the primary hole. thats what ive been doing for years now. </TD></TR></TABLE>

I never thought this would work...but i guess it would if you are tuning in open loop.

PM-Performance

have have to tune in open loop dont you? even stock computers i was told switch over to open loop after a certain spot

DaX

iTrader: (1)

I think most of the time you do [if not all of the time...not sure...I don't tune]. And I also think you're right...the stock ECU switches to open loop at or near WOT.

projectPSI

So i only need one bung? And just swicth o2 sensor when tuning?

PM-Performance

yes, you can put another one in for ***** and giggles, but you prob wont need it. most tuners like to take the primary out anyway jsut to make sure they dont get mixed signals or anything. becuase the stock sensor and when in closed loop makes changes to the mixture and can throw **** off when doing part throttles. i dont think full throttles its as much of an issue.

please correct me if im wrong, but im pretty sure.