hi

there would be many people running their engine w/o the catalyst, so this question is 4 u

if you have no catalyst on your B16A2 than your primary & secondary HO2O sensors will send the SAME informations to the ECU, how the ECU will react to that ? is it good for performance ? is it not ? i want to know everything........

thx very much !

 

so no one has an answer 4 this problem......

 

The ECU will likely throw a code indicating that the catalytic converter or secondary O2 sensor is bad. This probably would not decrease engine performance but would obviously increase exhaust emissions.

 

how will it increase exhaust emissions without decreasing performances ? since increase in exhaust emissions means bad Air/Fuel Ratio

or do you mean it by the way that theres no more catalytic coverter ?

 

yes

 

alright..... so in that way.......... the 2nd HO2S will be useless if u don't have a catalytic i'm i wrong ?

& honda engeneers puts that 2nd sensor only to test the catalytic converter, andit doesn't have any effect on the Air-Fuel mapping ???

 

Correct. The function of the secondary O2 sensor is to test whether the catalytic converter is working properly.

 

nice to hear this man but now how will i do against the engine check light.... since the ECU will continuesly detect a failure on the Catalytic..... :s... that light is anoying ... isn't it.... !

 

Search the forum. I have heard mention of people using "dummy" secondary O2 sensors to eliminate the CEL code when you don't have a catalytic converter.

 

Spark plug non-fouler will do the trick. Only problem you may have is space. On some exhausts the rear O2 sensor is very close to the floorboard so you wouldn't have room to install it. If that is the case, simply weld a new O2 bung on to relocate the sensor into a space that will allow you to install the non-foulers.

Basically the front and rear O2 monitor each others speed, and if your cat is gone the rear O2 is reading just as fast as the front one causing a check engine light. So the non-foulers simply take the rear O2 out of the exhaust stream enough to limit the amount the sensor see's, slowing down the signal again/tricking the ecu into thinking everything is fine, so no CEL. I've done this many times before, works on almost all vehicles.

Here is a writeup I found...This explains everything, with pics!

http://forums.evolutionm.net/showthread.php?t=215795

As far as performance, with your check engine light on your ecu is switched into safe/limp mode. This basically will decrease your performance because the ecu is now running extra rich(bad gas mileage) and the ecu will default back to base timing, so no advance at all...hence "safe" mode. Enables you to safely drive your car to your repair facility without damaging the engine.

Hope this helps