a/f meter O2 narrowband sensor location

Started by mpk490p, May 22, 2008, 10:16:40 AM

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mpk490p

May 22, 2008, 10:16:40 AM
i had a A/F meter lying around and want to hock it up in the 7 i need to put a bung in the exhaust but not sure of the best location
the Lambda sensor is just a 4 wire universal one with heater

Black = Signal [0.1 - 1.0 Volts]

Grey = Earth [0.1 Volts Max]

White = Heater [12 Volts]

White [ Heater 12 Volts]

the meter only takes 1 wire persume Black, so my question is
A) where is best to mount the sensor in the exhaust
B) do both white wires just hook up to 12v+ all the time the ign is on?

i know wideband is better but for now this is the set up maybe wideband in the future
thanks
Mark

hairyhoover

#1
May 22, 2008, 10:19:59 AM
With the narrow band i think your ok splicing into the lamba sensor wiring.

mpk490p

#2
May 22, 2008, 10:23:00 AM
Sorry this is for a Gen 1 i have no Lambda sensor on the car nice and simple carb set up, the sesnor will just be to run the meter no ECU

Thanks
Mark

Prof

#3
May 22, 2008, 10:31:24 AM
The heater wires go across 12V - via a Fuse (one end is on battery +ve, the other ground) - whenever the ignition is on. The sensor part then has 2 wires, ground and the output signal - which will drive your A/F gauge. You\'ll find that it will just go either Rich or Lean, as you have no ECU and the sensor is narrowband.
 
You\'d be better off with a wideband controller - like the Innovate LC1 and use one of the analogue outputs from that to drive your old A/F gauge - at least it will give you a meaningful display.
"Plus this engine is probably one of the most volumetric engines going! It passes more air than a herd of cows eating vindaloo\'s" - courtesy of AtomicRex

mpk490p

#4
May 22, 2008, 10:46:36 AM Last Edit: May 22, 2008, 10:49:52 AM by mpk490p
Quote from: Prof;501201The heater wires go across 12V - via a Fuse (one end is on battery +ve, the other ground) - whenever the ignition is on. The sensor part then has 2 wires, ground and the output signal - which will drive your A/F gauge. You\'ll find that it will just go either Rich or Lean, as you have no ECU and the sensor is narrowband.
 
You\'d be better off with a wideband controller - like the Innovate LC1 and use one of the analogue outputs from that to drive your old A/F gauge - at least it will give you a meaningful display.

Thanks Dave, i know wideband is a better set up and will upgrade at some point?
where would be the best place in the exhaust for this? i have heard to close to the manifold can burn them out?

Thanks
Mark

Prof

#5
May 22, 2008, 11:56:00 AM
I\'ve heard that as well, but mine is located about 12" down from the turbo and I\'ve not had any real problems.
 
Apparently you need to keep the sensor element under 900C - so god knows why it needs a heater element in the exhaust (actually it\'s so it comes on line quickly - but basically the heater is redundant once the things up to temp).
 
I\'d think on an N/A car you will have no problems.
"Plus this engine is probably one of the most volumetric engines going! It passes more air than a herd of cows eating vindaloo\'s" - courtesy of AtomicRex

mpk490p

#6
May 22, 2008, 12:04:12 PM
Quote from: Prof;501225I\'ve heard that as well, but mine is located about 12" down from the turbo and I\'ve not had any real problems.
 
Apparently you need to keep the sensor element under 900C - so god knows why it needs a heater element in the exhaust (actually it\'s so it comes on line quickly - but basically the heater is redundant once the things up to temp).
 
I\'d think on an N/A car you will have no problems.

i may leave the heater element out then, it is more for show at the minute untill i can go wideband

thanks Dave
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