I just bought it.Where can I fit exhaust bung for Bosch sensor?In the instruction manual says that bung must be far away from turbo.I not sure where to fit it.Does anyone has pictures of bung mounted on exhaust?

As long as its behind the cat it should be OK

Why behind the cat? On the Hayward & Scott 3" downpipe I have, the lambda boss is just before the flange that joins to the cat, the ideal location IMHO.

I think you mean in FRONT of the cat (ie the exhaust gasses hit the sensor before they hit the cat)

No, put it in front of the cat! The AFRs can be massively different before and after the cat.

Ecrab, please don't give definite answers unless you know for sure, mate. Don't mean that in a nasty way, it just confuses things and contributes to the great deal of mis-information you find on forums

Wideband sensors are more delicate than narrowband ones. Putting it a couple of inches in front of the cat will mean the exhaust gasses are still hot, but not too hot to 'burn out' the sensor. Also, make sure you orientate it so it's pointing downwards slightly into the exhaust. This will stop condensation pooling inside the sensor.

I got mine roughly 3 quarters down the side of the downpipe just before the cat. Its slightly slanted, 10deg gradient or something which as above helps reduce moisture/condensation build up.

Just remove the std narrow band and fit the wideband in its place. Use the controller to emulate a narrowband signal and wire that to the ECU and the wideband signal to the wideband gauge. One sensor doing two jobs . You can put it close to the turbo to get better AFR readings but you must use a lambda heatsink or it will die very quickly.

http://www.innovatemotorsports.com/xcart/product.php?productid=16148&cat=250&page=1

I am making custom 3" exhaust from turbo back.So I interested in best place to fit wideband sensor.In installation manual says that sensor must be 36" downstream turbo.I think that spot is aprox. in front of cat.

I started off with my Narrowband close to the turbo and wideband was in the bung. When I changed ECU's I run the wideband close to turbo with the heatsink. It’s up to you but the closer you put your sensor to the process the accurate the AFR readings. They tell you to put it 36" away if you don't run a heat sink. So if you don't want to use the heatsink put it where the bung is in my picture. Hope this helps.

iv got mine fitted on the exhaust behind the visco. can see it if you look down the back of the engine, good position so you can have it at a decent angle to keep condensation out.

Yes I wasn't thinking correctly

What is the best angle to fit wideband lambda sensor in to downpipe?

Anywhere between 10 oclock and 2 oclock.

Shame that H&S put it in at 3 o'clock but I've not seen any problems so far. What is the "heatsink" you are referring to TJ?

Here are couple of pictures of my wideband sensor



I feel that it should be tilted up a little bit (pointing at 2 o'clock) as per AEM datasheet. I have the H&S downpipe by the way.

Readings are fine (I think). I'm taking the car to the dyno soon and will compare readings from the gauge with the dyno readings (although readings are taken from different locations).

3 o’clock and 9 are just ok too but is better to get a slight angle if you can.

The heat sink means that you can put the lambda closer to the turbo. Lambda can’t take continuous heat above 850C for long so they damage, using the heat sink ensures they are kept cool but still able to perform.

89 bucks I don't think that the lambda probe would fit on my H&S downpipe with that heatsink, the location is much closer to the oil cooler pipes and it was hard enough to fir the OE lambda probe. But you might be OK with standard turbo and downpipe.

I know you want to see it i'd stuggle to to justify a tenner for it.

And it is quite long so fitment may be an issue.

The problem is they aren't as durable as the narrow bands.

Steve

Really? I thought the point of putting it further from the turbo is to ensure the exhaust gases have had enough time to give a consistent mixture?

If i remeber correctly the AEM manual states to install it approx 3 feet into the downpipe?

on my AEM manual:

"Mount the O2 sensor in the exhaust system at leas 18 inches downstream from the exhaust port. If you anticipe high EGT's (over 800°c), run a turbocharger , run at high rpm for extended periods , then you must mount the sensor at least 36 inches or more downstream of the exhaust port as all of these can cause the sensor to overheat.
For accurate readings, the sensor must be mounted before catalytic converters.To prevent collection of liquids between the sensor housing and sensor element during the cold start phase, the installation angle shoukd be inclined at least 10° from horizontal with the electrical connection upwards..."

Once the gasses come out of the cylinder that was your AFR. You should always try and put any feedback sensor for a closed loop control system as close to the process as possible, otherwise you will incur a transport delay. Look at where Fiat put the OE sensor it is about 2" away from the turbo. The only difference is that a wideband is more sensitive to heat so a heatsink should be used.

I dont think many people will be running a wideband as part of a closed loop system.

True but my point was to remove the OE sensor and put in the wideband with heatsink and use the wideband to emulate the narrow band to the ECU and the wideband to the gauge, that way you get better readings and don't have to make a new hole. And you use one sensor to do two jobs.

The reality is it makes very little difference to readings. I have tested tailpipe readings against downpipe readings and also against the narrowband. Sensor calibration aside, they are pretty much exactly the same so put it where it will last longest and has easy access!

just remember that you can only take tailpipe readings if you're running without a cat

Not at idle for those with 3" + bore size

Actually a CAT makes next to no difference Nigel. A lambda sensor measures oxygen content which is unaffected by the catalyst process so the readings are the same.

A large bore however can cause lean conditions for slow gas speeds but once up to circa 2000rpm it is negated.

Thanks a lot guys now I know what to do!What about exhaust gases temperature sensor?Where is the best for it?I believe closer to turbo the better?