im just wondering i you can loose power because of leaking exhaust

 

Yes depending on how close the leak is to the motor.

 

I would think that a leak would cause turbulence which would slow the exhaust stream velocity. A leak before an O2 sensor could cause altered readings and screw with your a/f ration.

 

Yea if it was before the O2 sensor then it would read that there was more oxygen than there really is and would send more fuel into the engine making it choke more and run rich. After the O2 sensor it would have air coming in making the exhaust back up when it hits the air coming in and thus less exhaust exiting the tail inducing power loss.

 

You don't lose any open loop power since the ECU ignores the o2 sensors then anyway. You'll just lose power during light acceleration and your MPG while cruising will suffer dramatically.

 

It depends on how loose the exhaust flange is.

 

The ECu will not "ignore" the o2 sensors b/c that would be the same as not having any 02 sensors and my car didnt want to run when I forgot to put one back in when I was looking at my exhaust to make a lay out plan for putting my y-pipe I am getting in. O2 sensors control A/F ratios and make the car go. The ECU will not bi-pass them.

 

Do you know who you're trying to argue with?

nismology is a sick bastard, he sleeps with his FSM

nismology > you

 

Wow, didn't know that an exhaust leak could have such drastic effects on performance.. but now that I think of it I guess it makes sense

 

Open loop = WOT, WOT = Wide open throttle, wide open throttle = 'flooring it'

 

son of a ***** i definetly need to change my Y pipe now after reading this thread and my cat back as well...

 

Make sure and read the thread properly including the red words.

 

And your credibility just took a flying leap out the window...

 

There had to have been something else that was preventing your car from starting because I dont have one of the O2 sensors plugged in (Bank 1 sensor 2) and my car stills starts up and runs.... it runs a little rich though.

which reminds me... I have to get that fixed!!

 

On my A33B... only half of my O2's are connected.

Downward spiral.... {insert whistle}

 

thats a load of crap.. ill explain it so everybody can understand... when u first turn ur car on in the morining for example the ecu will ignores values from the o2 sensors just untill the car gets warmed up..... same thing if u floor it the values are neglected...

 

but to answer the original post... i have noticed that after i installed the ypipe i now have a leak somewhere.. and the car is a LOT slower than it used to be.... and the gas milage also suffered...

 

i have leak between b pipe and muffler and i feels like car is slower little bit

 

i know this is a dumb Q? but could my cat. conv. be toasted since i have a leak on my flex pipe the one on my y pipe?

 

I heard an exhaust leak can also make your car faster ... from the guys at cartalk.

 

its cuz u need NAWWWWSSSS

i got bills, how bout i sell you a clue

 

I had terrible pick-up (especially low RPM) until I fixed my exhaust problem. Got it fixed and the car feels brand new again! What a difference.

 

My flex coupler blew on the stock y pipe. My engine sounded like crap and there was a significant power/mileage loss.

 

The question has been answered already. There is a power loss during light acceleration. WOT performance above 3000 RPM is unchanged.