just got a plx wideband and wondering if there is a reccomended bank(drivers side, or passenger side) to put the sensor in since i have true duals?

 

Bank2 Driver side ...

 

Interesting....my PLX sensor is in the Borla crossover pipe....which is where the tuner welded a bung / used a sensor while dyno tuning.

Any reason why the sensor should be in one location instead of another?

 

You want it as close as possible to the exhaust manifold, bank2 (driver side) run leaner on WOT so you want that bank for tuning to be on the safe side.

 

Really? I hadn't heard this before... can you link to a thread or something discussing this? I have widebands on both banks now but I haven't done a bunch of WOT datalogging yet to compare them (still breaking the engine in).

I'm also concerned about front/rear cylinders being richer or leaner, while the wideband is just reporting the average of 3 cylinders. Ahhh... to have a wideband in each cylinder

 

that is true. Should you compensate for the 2 cylnders that are known to run lean.

 

Is it 5&6 or1&2, I can never remember.

 

The bank2 running leaner is a common knowledge here for pro tuners N self tuners, do your self a favor and search wideband install and you'll find your answer.. I'm on a BB so I won't even try to do a search.. Lol

I also have a WB on both bank an I tune on Bank2. The difference is minimal but I have 2 different WB (tuner N Innovate) so the difference could be because of the WB controller N sensor being used or the condition/calibration....

 

i just did a plx dm-100 and sm-afr install on the Z, let me know if you need some help, it was fairly easy to do tho... also if you want to "log" you should buy their own cable for like $70! i said FuKc $70 for a cable and im making my own... if it works i will sell you one! pm me if you want to know more about how i have mine installed. i will put up pics later on.

 

5&6 are at the rear of the engine, 1&2 are at the front, but I'm not sure which runs leaner, the front or rear (or neither).

 

I think its 1&2 that run leaner...

 

thats the truth! i've got my wideband in the beginning of my downpipe right after my turbo on bank 2. When i blew my engine i broke the piston ring lands on cylinders 2,4 and 6 (thats the drivers side). bank one compression was fine.

 

Bank2 as close to the collector as possible. All VQ motors for whatever reason have always run leaner on that side.

1&2 with less air flow factory due to the slope of the intake, which is why the plenum spacers work so well. Less air = richer. 5&6 run slightly leaner on the G/Z because they get so much more air volume. Once you get a plenum spacer this generally evens it out a bit though.

On a twin turbo set up, you want to run slightly more fuel to 5&6 because of the heat from the turbos causing the cylinder temps to go up. Airflow should be somewhat equal even without the plenum spacer at that point because of the lack of vacuum. Single turbo and supercharged setups shouldn't have any need for more air to 5&6.

 

AthenG is fairly knowledgeable and pretty well respected on my350z. On all cars the Wideband should be as close the the collector as possible, and it's well known that Bank2 is the lean bank on these motors.

 

this is interesting considering the intake comes in on the driver side... maybe nissan compensated for this in the plenum? you learn something new every day!

 

I'd probably point to the way the air flows inside the plenum. I just geeked out in another thread and it's 11pm (13 hours at work today) so I'll pass on trying to explain it. But I know that the problem is solved if you have $1500 handy and can find the Cosworth plenum.

 

Lol you already recommended this one. Hey i still need to paypal yall for stickers and shirt.

 

I don't doubt his knowledge, but something still bothers me about this "bank 2 runs lean" stuff. Assuming:

1. The ECU can monitor left and right banks independently
2. The ECU can adjust left and right banks air/fuel independently

then why would Nissan decide to run bank 2 leaner? Either it's a mistake, or it's intentional. I wish there were Nissan engineers on the forum. "well known" on the internet means absolutely nothing to me -- on the Internet, everyone's an expert.