I wonder if I can emulate one of my O2 sensors... the closer one to the engine...?

Does anyone know if it will damage the engine in anyway? Or if it is safe at all?

Any info... I can get will be appreciated!!!



Thanks

 

its is just fine if it doesnt work you will get a check engine light thats it

 

the one closer to the engine is for closed loop operation i.e. NOT WOT.

it is responsible for your A/F ratio when in this mode.
I would'nt go messing around with it too much.

 

Why on earth would you want to emulate THAT O2 sensor? The second one is there to confirm cat efficiency. That one is emulated on cars with no cat so you won't throw a code.

You screw with the first one, and the car will run like crap.

Matt

 

i was just wondering... but thanks... i wont mess with it!
maybe the second one...
i getting ready to install a new race header and i wanted to see if i had to remove an o2... how safe would it be...

thanks!

 

It is totally fine. They are not correct your car will be fine. I know of three local cars that are my friends running with no cats and no sensors at all, no problem. With some cars it will mess it up - VW for example wont run right at all but the mini is fine.

 

I guarantee you that no MINI's are running fine with a simulator in place of the front O2 sensor. The rear, maybe, but not the front.

 

If you simulate a stiociometric setting (14.7 A/F ratio), the car will run straight off the look-up tables, with no feedback. So if the maps are lean, the car runs lean, if the maps are rich, the car runs rich. Even if the car does run, there's no way to make sure the fuel ratio is correct. So part throttle driving will be a problem.

WOT is open loop anyway, so it doesn't matter, but closed loop, it's not a good idea. And really, what's the benefit in removing the first 02 sensor? A couple of ounces of weight savings, and the motor flying blind? Rear O2 I can see, if you want to run without a cat. The liberal tree hugger in me thinks this is bad as well, and that a good, high performance cat is the right way to go if you're worried about back pressure....

Matt

 

They have check engine lights but on the dyno the air fuel and power remains the same.
I know that on most cars this will mess stuff up however I am just stating what we have seen.

 

Are they using similutors on the front O2 sensor or rear O2 sensor. On the dyno, at WOT, the O2 sensors aren't used for determining fueling.

 

They are not using any simulators at all.

Good point on the dyno you are correct.
on the street the cars do run fine but they would need to be data logged for a diffinitive answer and they have not. My advise would be to listen to andy and not any of the rest of us he knows his stuff. I was just offering up what I have seen but we have not done thorrow testing on this.

 

Ah, sorry I misinterpreted your post. Yes, you are correct, if you run a race pipe without cat, the engine should run fine, but the rear O2 sensor will notice the absence of a cat and will narc on you to the engine.

I wouldn't advise that.

 

for a good time I would run it with no emulators but pour a pound of marbles into your exhaust pipe. Just for sound though

 

I have two sensors at their places. No simulaters or such.. And i am not using a cat with my hamann header. Will it run better with a cat on? Or running without a cat is messing up my car?

p.s: I don't have error codes...

 

It hurts the atmosphere!

Matt

 

Agreed. IMHO, there is no compelling reason to run without a cat, except at a race track.

 

my car can be considered as a track car. But the thing is will it perform better or worse with or without the cat?

 

Same-ish.