Anyone successfully running a wideband with narrowband output into OEM (or piggyback)

Unfortunately you may find this feature on the AEM does not work very well. I've been researching widebands the last few weeks trying to decide which to get, every site that has anything negative to say about AEM is generally referring to this feature.

I'll probably go with AEM but I don't need this feature, if I did I'd probably go with something else. The products by 14point7 seem to get a very good write up everywhere they're mentioned.

 

I decided against doing this.......

because I couldn't see any great advantage in it (putting a bung in the exhaust is no big deal) but I could see a huge disadvantage in the shortened life expectancy of the WB sensor due to excessive heat.

Just as a matter of interest, zeds idle in open loop so O2 sensor signals are ignored by the ecu I've leaned my maps out to about 16 @ cruising anyway.... so about the only thing my oem O2's are doing is plugging up the holes

IMHO you should keep it simple...... zeds are complex enough already

 

Yeah missed that part, you don't want to install your wideband sensors in your dumps, you'll cook em. They need to be around 2 foot downstream from the turbo outlet, but before your cats.

 

The NB output of the WBo2 is simulated NB output.
Id not be too keen on mixing a simulated NB feed with a "proper" NB feed without doing some subjective testing/datalogging of each output to see if the figures from each sensor agree with one another.
E

 

I had a thread on this ages ago, never got around to it, and the wideband is still in its box.
thread here

From what I recall, the resolution of the narrow band o2 sensor, and wideband, is affected by heat. So too cold a sensor inhibits is ability to relay an accurate voltage referring to a given afr. This can be out by up to 30%. These need to operate between 500 and 900 degrees c.

Keep us updated with what you choose to do from here. I am interested in what you find out.

 

Yeh 2ft could work but maybe even 3ft down and vertical positioned within 45 degrees is better given the temps and carbon deposits really ruin these quickly
(as per instructions in manuals)

JC

 

FWIW. I had a couple of PLX widebands in the stock location running simulated signals to the stock ecu for several years some time ago. Never had any problems and it worked just fine for as long as i had that setup.

 

I just canned both of my o2's and had wbo2 gauge readout and input to nistune. Worked fine and got acceptable fuel economy on highway.

 

That's incorrect......

You THINK the fuel maps have O2 feedback because the cells are marked as closed loop ....... in reality, the ecu ignores the O2 signal at idle which effectively renders those cells 'open loop'

 

I am only quoting the instruction manual - it must be wrong then.

Nistune is a truly a great piece of kit!

Best mod I ever got.

JC

 

May be a 'carry over' feature for other cars.....

I understand Nistune is used on cars other than the zed, so maybe this feature is something that serves a purpose on another vehicle.

Fact : The 300zx ecu ignores the O2 signal at idle

Every zed will be accessing different fuel map cells at idle, so the obvious solution is to set all cells to 'closed loop' and let the ecu determine which cells each zed is using. Those cells are then treated as 'open loop'

Once any zed moves off idle, the ecu will then recognise each cell (so marked) as being 'closed loop'

 

As stated the zed is open loop at idle, I know r32 skylines are closed loop at idle for one. If your doing any tuning you will need to disable 02 feedback. Been ages since I played with it so might be wrong but I used to put the 02 feedback/coolant temp table off the scale. Saves unplugging stuff or ticking and untucking boxes. In saying that I got better economy by leaving them disconnected.

 

Nah, didn't put in original O2 spot. Welded in new bung.

 

Hey Guys

Given the relevance here of the thread thought I should ask quickly this question.

Is it possible to run both O2 and wideband sensors at the same time with input signals - say with nistune or is this just for tuning purposes only?

Is there any value in doing this - like can it average out the input signals if you did this by averaging in both signals?

My interpretation is that both do the same job, but one is just wider in band.

Cheers
JC

 

Both do different jobs. Narrowband (stock) returns a signal showing if the AFR it is above or below stoich. Wideband will tell what the actual AFR is.

 

I get it - so wideband is only tuning whereas stock is controlling constant

cheers for the education chrispy

I see that BMW sign displayed - how is the new baby going?