Which catalytic converter to use? (obd2 motor, obd1 ecu)

[alex37211]

I'm looking at getting a Carsound / Magnaflow cat.


I'm using an obd2 b18c1 (97 GSR) with an obd1 p72 ecu (95 GSR) in a 95 civic.
My stock 95 civic cat has no O2 sensor in it. A 95 GSR cat has one. A 97 GSR has 2!!

Will I have to use a 1-sensor cat with that ecu to prevent the check engine light from appearing? If so, would I need to wire it into the obd1 p72 ecu?

Also, If I used the sensor-less cat, could I bypass the emissions part of the ecu and avoid a check engine light?
thnx!

 

[IanB]

OBD1 ecu uses only 1 O2 sensor, the one before the cat in the manifold/header. That's what makes your decision, as that's what decides if you throw CEL's or not.

Use the sensorless cat, if your ecu is OBD1, you wont' throw any CEL's.

 

[monotech]

You need a o2 sensor hooked up regardless when using a stock ecu to prevent a check engine light.
Some o2 sensors connect on the front of the manifold but GSR headers have them on the top of the collector. If you have a catalytic converter with 2 oxygen sensor openings just plug the bung after the catalytic converter.