LC-1 widband hook up

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Originally Posted by joecar

This is how the LC-1 simulates the NBO2:

it is programmed something like this (approximate values):

50 mV == AFR 15.1
1000 mV == AFR 14.3

This is a fairly steep downstep...

Approximately midway between those is 400~500 mV which corresponds to AFR 14.7 (stoichiometric air:fuel ratio for gasoline)...

the PCM commands some fuel, and say it's turns out to be a little lean (PCM doesn't know this just yet), the O2 sensor then reports say 200 mV (leaner than 14.7), the PCM sees this and now commands a little richer, then O2 sensor reports say 700 mV (richer than 14.7) the PCM see this and now commands a little leaner, and the cycle repeats several times per second.

The steep downstep transfer function allows this voltage switching to occur between the PCM and NBO2 (the PCM drives it, the NBO2 allows it).

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It's funny....if you assume (like many people do) that 900mV is ~13:1, the equation for a NB simulation really should look like this:

50mV=16.3:1
1050mV=12.3:1

Then again, that's assuming the NBO2's output is linear. Wonder how that equation would actually work in practice???

Jeff, if you spread it out too much (make it less steep), then it behaves more like a wideband than a narrowband... it won't switch, it will report the actual AFR... :D

Remember, a narrowband is accurate at 14.7, and all else is just "rich/lean relative to 14.7".

Quote:

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Originally Posted by joecar

Jeff, if you spread it out too much (make it less steep), then it behaves more like a wideband than a narrowband... it won't switch, it will report the actual AFR... :D

Remember, a narrowband is accurate at 14.7, and all else is just "rich/lean relative to 14.7".

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Makes sense...

Didn't have my coffee this morning. :doh:

I have the 6 wire LC-1 (so no green analog ground).

When stripping back the rubber protective cable to seperate out I discovered a bare metalic wire.

Now this wire was inside the rubber and not exposed at all. The confusing thing is the LC-1 manual refers to a metalic wire for sytem ground if using a 6 wire LC-1. There is no mention of a white cable for the six wire.

Any ideas?

Have just bench tested my 6 wire LC-1

the metalic wre that was hidden away inside the rubber armour is actually a system ground too. Not sure if thats any use to anyone so far but for people in the future that may get the 6 wire you actually do have the green wire too - only it has no sheilding and is hidden away inside the armour.

For those that have mounted under the car where did you go for and what route did you take to get the wiring into the car?

My wideband sensor failed last night (error 8, extended idling in stopped freeway traffic)...

Anyone know where they can be obtained for the best price (including shipping)...?

What is it's part #...?

I've heard of them (5-wire Bosch LSU4.2 or whatever they are) being sold for $55~$60. Don't remember where though.

Quote:

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Originally Posted by joecar

My wideband sensor failed last night (error 8, extended idling in stopped freeway traffic)...

Anyone know where they can be obtained for the best price (including shipping)...?

What is it's part #...?

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joe your best bet is to get the VW equivilant sensor from a vw specialist = $$$ saved. 021-906-262-B = part number but as said the sensors are cheap the controllers a bastard

BTW Managed to get it all in, I used the gromit above the transmission tunnel and dropped the 02 down the hole. How long those screw clips will last one can only guess but so far its all hooked up - much happer with teh lc-1 being in the car too!

Ok, thanks. :cheers:

no! Thank you! I start logging tomorrow - lets just hope the wires all stick together ;)

As for that partnumber its in the LC-1 document so if its wrong dont sue me ;)