Will a wide band o2 sensor have correct readings at tail pipe with cats???
Will a wide band o2 sensor have correct readings at tail pipe with cats???
Close enough. All the tuning shops use tail pipe sensors. Usually only the permenant installations go before the cats.
2013 Jeep Wrangler JK
3.6 V6
More MODs than Stock
2018 Ram rebel
5.7 Hemi V8
Stock
I have found with my LM-1 WB02 that readings after the catalytic are
nothing like the readings taken before the catalytic.
This is especially true with 2 and 3-way converters.
The readings I have taken differ between 1.1 to 1.4:1 between light load,
and wide open throttle.
In the end, you want to tune for what the engine needs, not what the
sensor reads. If you have access to a dyno, or better yet a race track
tune the engine for best MPH through the trap, or best average HP over
the RPM band used.
2013 GTM Gen.1
Modified LQ9 w/G96.00
if you go to a dyno they will ask if you have a cat. if you dont they use the tail pipe if you do the weld in a bung before the exhaust. so no you cant use it in the pipe with a cat if you want to be accurate.
96 l67 CAVALIER. PT76GTQ TURBO AND IC. PB: 10.62@138MPH ON 19PSI. DYNOED 502WHP AND 415FTLBS OF TORQUE.
We try to use the O2 in the header pipe prior to the cat for accuracy by removing the OEM sensor and installing our wideband and forcing OL operation until we have the air model complete.
When at the tailpipe it is influenced by pressure pulses bringing ambient air into the tailpipe, worse at low speed and more so with more cam overlap.
Post cat readings are not reliable until the cat bed becomes saturated.
Most guys swag the readings to the lean side to realize richer in cylinder mixture.
Michael
Michael Rauscher
L&M Engines
246 E. County Line Rd
Hatboro, PA 19040
215-675-8485