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O2 sensor, how far downstream?

S

Sweep

New member
Joined
Dec 29, 2014
Location
Peterborough - UK
When making my 3" downpipe for my HY35, I copied the original 13C downpipe and welded in the Lambda port a few inches downstream after the turbo, I figured if it worked for stock cars it must be fine (lol), right?
How far down the downpipe have you guys got yours?

'95 940 on 2.4
 
If the OP means the wideband sensor, I believe AEM says at least 30" from turbine exit (maybe 36", no coffee yet).
 
If you have a 86+, it will use a 3-wire O2 sensor. One of the wires is the signal, the other 2 are power/ground for a built-in heater. The heater gets the sensor up to temperature faster so that emissions are reduced sooner. As long as the O2 sensor is before the CAT, you're fine.

The older LH-1 and K-Jet cars use a single wire O2 sensor. For these, mounting them closer to the exhaust manifold makes them warm up faster.
 
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