I’m presently running with a narrow band lambda sensor and have purchased a wide band sensor (Bosch LSU4.2 ) to aid with tuning.
My original idea was to just cut the wires to both sensor and car and splice them together but after seeing the sensor it has a box as part of the connection plug (see picture) What is this box? Do I need it? If I do does anyone know where I can get the other connection plug to connect to this one?
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Well thats what i thought to!

But the problem is they measure far in a different way then a normal sensor.

i guess you need electronics to convert the signal to the normal voltage read devices.

first thing is it has a temp sensor in it and you need to work with the internal heater to keep it steady on a temp. then there is
the intenal way of measureing wich consist in a way that the more ocigen the more amps is needed (resistance changes) etc..

Tks

The wideband sensor on its own is no good to you. You need the controller for it. I guess the plug is to plug into the controller.

I have bought an Innovate LC1. Not cheap but it is a ready made solution and will link up to both a gauge and the Megasquirt.

I reckon the £145 will be repaid in time saved tuning and extra economy once I get as far as running it.

Hi Piddy,

TangoMan is spot on - having a wideband on its own is useless unless you have the controller.

The LC-1 packages do seem to be pretty competitive although their returns policy sucks!

I believe some hire a wideband sensor to tune their engine.
When they hire these does the controller come with it?

sow basicly you need the/a controller for it to..

Tks

So does a Megasquirt act as the controller instead,

Or to tune it do you need, the Wideband sensor + Controler + megasquirt?

The megasquirt does not have the wideband controller built in.

Ahhh, so the Wideband Lambda is purely a sencor

The controler converts this into and analogue signal

Which is then interpreted by a guage or ECU

That sound about right folks?

thats it..

in that way it the wide band + controller can subsitute the old narrowband sensor..

Tks

My understanding was that the signal from the narrowband sensor "went the wrong way" if lambda was significantly out - making autotuning without a good baseline setting impossible. The wideband is monotonic so is more useful for tuning from scratch but no better once you're in the right ballpark.
I was confused 'cos to me wideband means wide frequency response....!! I thought they were otherwise interchangeable???
I'm sure I'll get put right by someone who actually knows......
cheers
Bob

The difference is that with a narrowband the voltage is severly non linear with respect to AFR. It swings virtually from one extreme to another around 14.7/1 AFR. Wheras a wb can be set to change linearly.

This means that with a narrowband it is a guess as to the AFR away from 14.7. This doesn't help when your trying to tune for around 12.5/1 at full load.

There is a good description with graphs on the MSEFI site.

HTH

Colin

Its true that wideband means a bigger resolution. But because it works significantly different and has a internal heater in it (wich needs to be pwm ed to be a steady temp.) it cant simply be interchanged by a normal one.

Tks