WJ MARK

iTrader: (7)

It won't read the 2 banks individually. you want to be able to see what 1,3,5,7 are doing on one side and 2,4,6,8 on the other side.

shakinlm7

iTrader: (5)

That doesnt make any sence to me... Wouldnt one NB accurately read its 4 pistons but the wb in the down pipe is going to be read all 8.

350SS

iTrader: (36)

I can't see how you would be able to have accurate readings for both banks for closed loop operation if any of the NB sensors are located in the down pipe, or anywhere after the pipes merge on a single turbo setup.

350SS

iTrader: (36)

I'm probably going to try putting the nb sensors on each bank near where they would be in a stock location (just after the exhaust manifolds) and my wb will be about 12-24" down the down pipe.

OLD BULL

iTrader: (1)

The nb o2's will have a little offset on the l-trims with one nb in the crossover and one in the downpipe. If both nb are on the down pipe the engine runs like ****. I tried it twice on my truck and both times it ran great till it went into closed loop. Maybe someone else can shed some light on exactly why it doesn't work.

350SS

iTrader: (36)

My guess is that the nb in the downpipe is so much further away from the exhaust ports compared to the stock location, when the pcm makes adjustments during closed loop operation it is doing so based on "old" information. Meaning that the exhaust hasn't travelled down the pipe to the nb since the ecm made it's last a/f adjustment. So it would continuously "overshoot" the correct afr. If you can adjust how fast the pcm makes closed loop adjustments, this might correct the situation. This is just a guess based off of my limited knowledge of closed loop operation.

OLD BULL

iTrader: (1)

That sounds reasonable. The l-trims were tracking together then went extremly lean or rich with no concistancy, and a large offset. Others as well as myself have one in the crossover and one in the down pipe with no problems.

Slowhawk

iTrader: (11)

Since the backpressure of the turbo is present on the 02's they are not as accurate anymore. Put a wideband in there and you'll see the difference.
Design of the system determines where the 02's go. If it is a log you want 1 02 on the driver side and the other in the downpipe.You do not want the 2nd 02 in the log. If your running closed loop it will screw with the tuning.

If you have your own software then go 2bar SD and shut the 02's off.This is how my truck is done and runs perfect.No worries of 02 problems.

Also,my wideband is in the downpipe about 12" from the turbo.