At the moment my mods are dp, gutted cat, cb, and a drop in air filter...

im trying to learn about the "wideband" oxygen sensor for our cars. What brands are available? I know im planning to buy a PFC soon, so might as well get a wideband o2, fuel pump, fuel injectors... etc...

im just wondering... what are my options for the wideband o2?? and which are good?? tanx in advance

 

Do some searches in this forum and the ECU forum.

Basically, there are two affordable good quality options:

FJO wideband: www.fjoinc.com (auto division)

and the

Techedge wideband, which is built in Australia.

The TechEdge is a little cheaper than the FJO but the FJO looks like a more finished product.

After these two, the price starts climbing quickly.

 

tanx for the info rynberg... i will look into that...

one more thing, is it a good idea to leave the wideband sensor on the dp all the time?? or only when tunning??

 

FJO claims standard OEM durability for their sensor (which is just NTK sensor) of 25-30k miles. It is better to make a separate bung for the wideband sensor in the downpipe anyway -- it's better to be a bit further from the turbos. Most people have their sensor mounted at the bottom of the downpipe (near midpipe) after it goes horizontal.

 

after reading past thread... one way to make it durable is to put the bong at the end of the dp... but i still think its hot there... maybe on a midpipe or something... hehe

 

I keep my bong inside the car at all times.

 

If you get the Techedge OZ wideband I would wait a month or so until v2.0 is released, it will use the cheaper Bosch wideband sensor rather than that impossible to find and expensive Honda sensor.

 

Marshall: a bong and bung... its doesnt matter which you inhale, it still will kill you...

mjw... thanx for the info... here i cant hardly find a good bosch sensor... and it takes a while to order from singapor or japan... so i guess that will help a lot!

I have cheked the web site www.techedge.com.au the problem is, would it be difficult to install it myself?? i can not relly on the shops here as there arent many rx7 from where i live!?!

 

Just to add, AEM released their wideband system last week. UEGO sensor and electronics for roughly $360. Downside is that there's currently no option for a display since it's basically geared toward their AEM EMS. However if you have a PFC and datalogit, it should still be useful. If you search in the PowerFC forum for "AEM wideband" you should find a post I did a while back of the details.

 

It wont be a while till i do get it... so im still doing myresearch! Tanx TailHappy... and for the rest of you all for ur contribution...

 

Sorry to bring a thread back from the dead....

I thought that the best place for a WB o2 sensor was as close as possible to the turbine outlet. I could be confusing that with the most ideal location for an EGT sensor though.

In the pic below which circle (left, middle or right) would be the best place for a WB sensor? Or does it really matter? I wanted to put it in a location that would allow me to easily swap out the WB sensor with a bolt (to plug up the bung). I was thinking the left circle on the left side would be a good place...unless of course there is something in the way. The DP in the pic is the old M2 DP BTW.

Thanks

 

Also, another quick question. Does the FJO have a digital bar display or digital number display?

EDIT: n/m according to the rx7store it has a digital number display.

Thanks

 

FJO wideband all the way.

 

FJO has 4 kits ranging in quite the price, whats with the one that says "with RPM" whats that for?

 

My FJO has a bar graph or number display. I can switch between them.

See here:

http://www.alamomotorsports.com/fjo_wideband.html

 

I wouldn't recommend installing a WBO2 at the turbine outlet, but it should be OK.

You can mount a WBO2 just about anywhere as long as you are not downstream of a catalytic converter (introducing air). Tail pipe sensors are typically used on dynos.

I went for the midpipe mount.

 

The sensor needs to be placed vertically. This limits placement options. It should also be placed near the bottom of the downpipe as the exhaust temps will be slightly cooler there.

You guys should read Crispy's write-up on his site:

http://www.negative-camber.org/crispyrx7/wideband.htm

 

His DP looks a tad bit crooked. I'm having the WB bung without pre-fitting it on the car. So that means I wont know the exact location to weld the bung to where there wont be anything in the way.

The sensor in Crispys pic appears to be about 9 inches forward of DP to cat flange. Does that distance sound about right? I am about to get my DP off to get a bung welded on but I kind of wanted to get it right the first time.

 

WB sensor placement: the WB sensor is more sensative to heat than the oem sensor. since rotaries can run around 1750 degree exhaust versus piston engines (around 1230 degrees) it is important to place your sensor near the (cooler) tail-end your DP. it is not suggested that you mount it after the rear DP gasket as if air gets in at the joint you will have incorrect readings. finally, the sensor needs to be mounted between a ten and 2 o'clock (near straight up and down) position so any moisture will drain out.
howard colemam

 

Sensor placement was pretty much covered in the link rynberg posted. But I am wondering if the entire area above the rear section of the DP is clear of obstructions.

Can I weld up a bung as close as an inch to the DP flange? or is there a certain section that is XX inches in front of the flange that I want to weld the bung to that has the most clearance (above the bung).

 

So you are expecting air leakage in? Our exhaust will be above atomospheric and will only leak out. Air will not leak in.

True about keeping the sensor between 10 and 2. Mines at 2.

 

That's the midpipe/cat converter pipe.

 

Thanks for pointing that out mmaragos.

I found a pic of an aftermarket DP (installed) on the ciriani site. Judging by the pictures on his site, the best place appears to be at the left circle on the second pic. I'm thinking at maybe the 10 o clock position too.

What do you guys think? I want to get a bung welded onto my DP before I install it, and that's where I think I will do it.

EDIT: actually, I have to change my oil in a couple of days, so I guess I could check for the clearances when I have my car on the lift.

 

It doesn't have to be completely vertical.




Also, there's another wideband controller on the market that's more affordable than the FJO and more complete than the OZ. It's at plxdevices.com. I just got one and will replace my Oz with it. Linear output, simulated narrow-band, integrated diaplay, fully digital.. Their instructions would have you cut up the cable because they can't get connectors for the LxHx sensors, but you don't have to.

 

does anybody know a brand from the asian region? it would be a less cost effective method for me since i have to pay for shipping...