Lambda sensor
Turbo Mini Forums

This is truly my main Christmas present from the wife, not to sure where to weld in the
boss on the exhaust pipe, Instrutions say minimum 18"s from the manifold outlet, Ideas
or pics as to where you guys have fitted yours please.. Thanks.. Alan

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Nice one :)
I think people tend to fit them in the end of the downpipe, just before or around the gear linkage/selector, for easy cable access/routing.

Edited by Carlzilla on 23rd Dec, 2011.

Wherever it fits...

Mines around 6" from the turbine wheel. Not had any problems.

In the 13's at last!.. Just

Mine is right after where the bend finishes on the elbow. Probably about 6" from the turbo too. Been like that for 4 years with no problems.

I mounted mine here...

Edited by matty on 23rd Dec, 2011.

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1/4mile in 13.2sec @ 111 terminal on 15psi

This is where mine is mate hope it helps.



simon

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

There are two types Ive been told, Wide band and Narrow band, mines a wide band and should not be to near the heat, yours is somthing like.. Will wait a bit to see if there are any other Ideas.. Thanks guys.. Alan

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Mine is a wideband and has been fine. But there shouldn't be any problems mounting it where Simon has.

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1/4mile in 13.2sec @ 111 terminal on 15psi

How do I link your posts to my answers if you know what I mean..

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quote

I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

Not sure what you mean? Do you mean quoting?

I forgot to say. A wideband sensor should have a heater built into them, as they rely on being hot to give an accurate reading (400 degrees c rings a bell but could be wrong)!

I placeed mine close to the turbo and out of the airflow, to hopefully get a more consistant reaing. Not sure if it really necessary though?

Edited by matty on 23rd Dec, 2011.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Ive read instrutions and it deff- says no nearer than 18" from the top of exhaust, my turbo is T3 with metro down pipe

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I have started posting on Instagram also my name on there is turbomk1golf

Nothing is impossible it just costs more and takes longer.

Yea sounds right, can not put mine at the top any way, Its got the cast elbo at the top..

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Mine does the same Simon, I have to wait a while for it to give a reading.

If you're worried about it getting too hot, mount it further away from the turbo. Worst case senario would be that the heater would kick in and warm it up if it cooled, but too be honest with constant exhaust gases passing it, I can't imagine it would ever happen!

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1/4mile in 13.2sec @ 111 terminal on 15psi

good to see your thinking about thos sort of thing, a lot of new members dont think in this way

a lot of wide band manuals state a certain distance form a turbo, or a temperature, but realistically you can get away with a lot closer, bear in mind they have to account for somthing like a big v8 making a LOT of power ( read a lot of heat).


mine is about 5" from the turbo, and has been there for about 10k miles with no issues,

dont put it after any flexible joints in the exaust that could leak and skew the reading,

also re the heatng of the sensor, they do take a while to heat,

my vems one had a count down while it was heating, since updating the firmware the warm up doesent have the count down and takes much longer.

Thanks Joe, that all makes sense to me, would not have thought about the knuckle
joint, Its simplyfide things now I know not to get at the wrong side of the joint.. Alan

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happy to help! :)

18" from the top of the Exhaust (whatever that really means?) is bollox. When you get a chance, look at any modern VW where the lamda sensor is placed!! Its alot closer to the engine than 18"

Saab GT17 downpipes have the labmda about 4" from teh turbo on the first bend.

A lot of modern engines, contrary to popular opinion, actually still use narrowbands for their ECUs.

Narrowbands can be a lot closer to the manifold/turbo (ie, can run a lot hotter).

The temperature limits for a typical Bosch wideband LSU are published freely on the Bosch datasheets. There is a limit for the body temperature and another limit for the gas temperature.

But as Joe says, the distance limits that aftermarket suppliers quote tend to be very conservative as they have to cover for the worst case and don't want returns for failed items.

It is difficult to be too cold with a wideband, the heater is powerful enough to heat the cell to the required temperature when the sensor is out of the exhaust (ie, during free air calibration) but, as Joe says again, be careful of putting it too far away where additional air may have leaked in and mixed with the exhaust gas.

Schrödinger's cat - so which one am I ???

Edited by Sprocket on 24th Dec, 2011.

This is the view from the top, not much room there for access..


I think the best place for mine is where Simon has put his
and It’s before the flexi joint that Joe C brought to my attention..


It just goes to show its worth asking these questions on this great forum,
thanks again for all your help, I’ve bean in engineering and messed around
with all types of motor vehicles most of my working life, but you can never know
everything about any subject and you’re never too old to learn, be rest assured
I’ll keep pestering you guys with my queries If that’s OK, Thanks again.. Alan

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No worries Alan, its what everybody is here for! To ask and answer questions, a bit of a laugh and banter, and helping others out with stuff :)
No doubt you'll be able to answer somebody elses query at some point with your own experiences!

IIRC someone previously also said to make sure you put it at a slight angle so condensation can drop off.

Dazed and Confused....