been reading about oxygen sensors and their need for good connections and not to solder connectors as the sensors receive 'reference air' signals that don't carry across too well or at all if soldered
anyone understand this technological jargon
I think it is along the same lines as oxygen free copper stereo speaker cable
O2 sensors get reference air signlals..????
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tim_81coupe
- General Member
- Posts: 1693
- Joined: Tue Oct 04, 2005 10:00 am
- Location: Perth
Not quite. For the piezometric element to work it needs a reference of atmospheric O2 levels. One wire sensors normally get this reference through the housing, I believe two and three wire sensors do this also. The problem is that due to the heat in the vicinity of the exhaust the reading is not always 100%.
So basically one of the wires on a 4 and above O2 sensor is your "reference air" signal wire. This is basically a way of keeping the pickup for the O2 reference away from the heat of the exhaust. In real terms there are minimal gains to be made from this.
The reason that you still don't solder the connections of an O2 sensor without the air reference wire is simply that solder won't stick to them! I'm not sure what metal the wire is made from, but its not copper. Most good O2 sensors come with appropriate crimps.
If you're making your own EFI system (which I think you are aren't you?) you'll be best off using a 2 or 3 pin sensor, as these have a heater wire to get the element up to temperature very quickly, giving accurate O2 readings seconds after turning the key.
So basically one of the wires on a 4 and above O2 sensor is your "reference air" signal wire. This is basically a way of keeping the pickup for the O2 reference away from the heat of the exhaust. In real terms there are minimal gains to be made from this.
The reason that you still don't solder the connections of an O2 sensor without the air reference wire is simply that solder won't stick to them! I'm not sure what metal the wire is made from, but its not copper. Most good O2 sensors come with appropriate crimps.
If you're making your own EFI system (which I think you are aren't you?) you'll be best off using a 2 or 3 pin sensor, as these have a heater wire to get the element up to temperature very quickly, giving accurate O2 readings seconds after turning the key.
82 MY Wagon, EJ20G
87 RX, EJ20G
89 Brumby, EA81
12 BRZ, FA20
87 RX, EJ20G
89 Brumby, EA81
12 BRZ, FA20
Is this a Mega-squirt 2 by any chance?tim_81coupe wrote:If you're making your own EFI system (which I think you are aren't you?)
If it is, please keep us informed of your progress
'03 Forester X, stock standard for now.
'89 EA82T Touring Wagon, 5-speed D/R, 14" alloy wheels, bullbar. (Past ride)
'81 MY wagon, 3" lift, 5-speed D/R, Weber, 14x27" tyres. (Past ride)
'89 EA82T Touring Wagon, 5-speed D/R, 14" alloy wheels, bullbar. (Past ride)
'81 MY wagon, 3" lift, 5-speed D/R, Weber, 14x27" tyres. (Past ride)