whats the best place to fit the lambda in a exhaust on cossie from the turbo! seen ones on the turbo and ones near the gearbox on the exhaust?

this is for wideband aswell

 

You'll get as many answers as the people you ask. I have heard 8" from the turbo, above the horizontale line. But cosworth came with one fitted to the exhausthousing so.. Anyones guess

 

Here's a pic of mine fitted mate, MSD didn't complain when the car went up there so it's fine

 

The closer to the turbo the less it's life will be, it ideally needs to be at least 1 METRE away from the bearest exhaust valve, widebands will overheat under boost, you must also have at least 20" after the lambda of exhaust left as well.
This applies to a cossie, unless normally aspirated where different criteria can suit and generally the lambda can be closer.
Ideally mounted between 10 degrees from the horizontal to 15 degrees to the vertical, due to heat soak.
hot cams that give lots of valve overlap can give very lean readings at idle and low power due to air escaping into the exhaust at "off cam" operation.
It differs a bit if the sensor is a PUMP CELL sensor like BOSCH 4.0/4.2(same thing!!)
The heater in the sensor can warm the sensor no problem, but it cannot cool where they are placed too near a red hot turbo.
You could even go for a tail pipe sniffer design, but not needed on a cossie.
Depending on the controller, these will tell you whether it is too hot or too cold, Tech Edge have this facility.
tabetha
info gained from tech edge website, compiled with the help of BOSCH

 

Chris put your fooking book away and speak English

 

I put mine close and then use a heatsink bung.

What you dont want, is it after too many exhaust joints, ie not beyond the downpipe, or it adds to the chance of getting misreadings if they leak slightly.

 

The STACK instructions with mine said roughly 10cm.... - but hey, what do they know....

 

6-8" will be fine, did 120 dyno hours with a Bosch LSU 4.2 about 970 deg C and still fine.

 

mine is a similar distance to the one pictured above but round the side of the exhaust a bit.

 

My sierra one is about 1-2" further back, and at the same angle.

Ive killed a sensor through heat, when I wasnt using a heatsink, but mine was an extreme case.

 

ford put the std lambda on green top cossies IN the exhaust housing of the turbo...


the sensor will heat itself to a very high temp nomatter where it is, ive never had a sensor fail due to excessive heat, and i have run my sensor in the turbo for over 3 years at 32psi

 

they should be able to stand VERY high temps for 30k miles before failing

they can fail sooner though i must admit and heat can cause it usually lean running engine or burning of oil can damage the sensor,,, thats what bosch technical told me aswell

quite a safe reply from them i thought pmsl