Oxygen Sensor
Turbo Mini Forums

Whats the best place to mount an oxygen sensor and what read outs should i be looking for ie lean or rich?

Thanks

i fitted mine in the Y piece after the join of the 2 pipes on my carb car.

on the turbo, i mounted it just at the start of my through pipe, just after the turbo downpipe joint. made it easier to run wires up through reverse switch wire gromet in floor.

its better to have it nearer the engine as poss for un heated ones i think.

Edited by mini-marauder on 2nd Feb, 2005.

Sooperdooperturbocooperexpertengineering!

easiest place is to put it just in the downpipe i guess. not got one on mine but will do this year.

Mines going there anyway.

Mines in the end of the downpipe.

Phil.

WWW.TURBO-MINI.COM

Ours is about half way between the turbo and the downpipe bend. It seemed the best place, where there was enough space.

As for voltages:

Sensor output ranges from 0.2 Volts (lean) to 0.8 Volts (rich). A perfectly balanced or "stoichiometric" fuel mixture of 14.7 parts of air to 1 part of fuel gives an average reading of around 0.45 Volts.

For more info see http://www.picotech.com/auto/lambda_sensor.html

Ben

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

Should it be perfect or should it be leaner or richer?

Turbo engines are 'safest' between11 and 11.5 on lambda - don't know what that is in volts though...

oh, mine is in the elbow - the hotter the better!!! LOL!

Yeah I got a heated one so I'm not arsing about waiting for it to warm up.

The Bosch sensors are rated to work at 700c / 1300f anything above this temperature they become very inaccurate.
Location depends on the type of sensor you have, if it?s heated via a 12vdc supply then you can place it further from the engine say around the remote gear change and take the wires through the floor as mentioned earlier.
If it?s an unheated sensor then it?s essential that it?s placed close but not to close to the engine say in the lower section of the downpipe this way it?ll get the temperature needed to heat and keep it clean but won?t get the sensor to hot and cause inaccurate readings.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

its a bosch 4 wire sensor.

Tech sheet for the WB bosch sensor.
http://wbo2.com/lsu/Y258K01005e03mar21eng.pdf

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

OK Now i'm getting confused. A lot of nice graphs though. Would it be best to keep it lower down on the down pipe like say at the bottom?

put it half way along the down pipe :)

Alex

AlexF

Cheers guys for all the help.

wide band sensor is quicker and more accurate (but as usual costs more), measured voltage is 0- 5 v i think ,air fuel ratio i would go for is 12:1 which equates to 6.5 percent CO under load , just put it somewhere the speed ramps wont attack it !

My current sensor location and it's working a treat. Narrow Band 4 wire heated bosch sensor.



Karl.

Edited by Doodmeister on 3rd Feb, 2005.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

Doodmeister... what output / gauge are you using?

Sooperdooperturbocooperexpertengineering!

what do you have you car set to. Rich or lean

Sensor and Gauge came of ebay.
http://www.si-invension.de/


The car isn't a turbo (but my other car is ) and i set it up using the innovatemotorsports LM-1 gauge. You can use the cheaper gauge from SI to tune but not being wideband it's not so easy. My cars running a 45 weber and seems to run rich under load and idles at midpoint say 14:1 (Green on the gauge) so not to bad.

http://www.innovatemotorsports.com/products.php

Karl.

Edited by Doodmeister on 3rd Feb, 2005.

Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe.

anyone know a place where you can buy a wideband sensor? i know narrowband ones are very easy to come by, but where the hell do widebands come from? new only? how much ??

cheers guys,

Pete

And on the 7th day........... God created turbochargers!

For wideband O2 sensors, try .
All info there, where to order, part numbers etc.

Cheers

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