piddy
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| posted on 4/1/07 at 11:27 PM |
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Wideband sensor
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?
 
Rescued attachment dcp_4453 50.jpg
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tks
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| posted on 4/1/07 at 11:33 PM |
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mhhh
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 above comments are always meant to be from the above persons perspective.
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TangoMan
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| posted on 5/1/07 at 12:24 AM |
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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.
Summer's here!!!!
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muzchap
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| posted on 5/1/07 at 12:37 AM |
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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!
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If you believe you're not crazy, whilst everybody is telling you, you are - then they are definitely wrong!
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piddy
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| posted on 5/1/07 at 09:45 AM |
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I believe some hire a wideband sensor to tune their engine.
When they hire these does the controller come with it?
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tks
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| posted on 5/1/07 at 10:29 AM |
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yupsz
sow basicly you need the/a controller for it to..
Tks
The above comments are always meant to be from the above persons perspective.
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MkIndy7
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| posted on 5/1/07 at 12:31 PM |
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So does a Megasquirt act as the controller instead,
Or to tune it do you need, the Wideband sensor + Controler + megasquirt?
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chriscook
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| posted on 5/1/07 at 05:44 PM |
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The megasquirt does not have the wideband controller built in.
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MkIndy7
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| posted on 6/1/07 at 11:16 AM |
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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?
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tks
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| posted on 6/1/07 at 12:35 PM |
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yupsz
thats it..
in that way it the wide band + controller can subsitute the old narrowband sensor..
Tks
The above comments are always meant to be from the above persons perspective.
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Bob C
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| posted on 6/1/07 at 07:39 PM |
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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
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CairB
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| posted on 6/1/07 at 09:15 PM |
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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
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tks
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| posted on 8/1/07 at 07:19 PM |
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BOB
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
The above comments are always meant to be from the above persons perspective.
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