no. your O2 sensor wont read hardly anything at all since the exhaust will be shooting outside of the car and not into the pipe where the sensor is on. it only throws a cel when too many fumes are pushed through the sensor area.MSP608 said:
Exhaust Cutout? Good idea?
- Thread starter Run for Cover
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SpeedBeaver
Member
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- Mazdaspeed Protege
I just putted a set of non-foulers on the new midpipe and I never saw a cel since the beginning of the summer.
SpeedBeaver
Member
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- Mazdaspeed Protege
I think he meant when the cutout is closed and the fumes are going throught the normal exhaust path.MP3Architect said:
is true but i still never get a CEL even the few times im running closed.SpeedBeaver said:
speedcicle
Member
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- 2003 mazdaspeed protege. Spicy orange mica
MSP608 said:
yea you would think if you open the exhaust the 02 sensor would read a lean condition and throw a cel......because no exhaust is passing it. Unless the 02 sensor is upstream of the cutout.
SpeedBeaver
Member
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- Mazdaspeed Protege
what I meant is that when the cutout is closed, at least in my setup (see pictures in the link I posted above), there is no cat before the o2 sensor, thus it could throw a cel. That is why I putted the non-foulers on.
because your cutout would be replacing your first cat (or at least it does in my setup). So when closed you would be missing a cat.MSP608 said:
and how can you throw a cel running lean? wouldn't you throw a cel idleing then?
mazdaspeed/se-r
Member
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- Nissan, Sentra SE-R
Well i run open s-pipe because the performance is dyno proven, plus i love the way it sounds, loud yes but worth it even more. cops where i live dont care, i just ease the throttle when i see one anyways and its pretty quiet, neways my cel came on when i started running that way for the reason the O2 sensor isnt reading any exhaust gasses at all. The code it throws is 02 not reading. It doesnt make the car run bad at all. in fact my gas milage is higher than most at around 32 intown and ive gotten 41mpg on the highway usually averaging 38-39mpg. Now if you unplug the o2 sensor then yes you will throw a code and the car will run like crap because it will think there is a malfunction in the system causing the o2 not sending a signal back to the ecu.
Velocifero
Wham Bam thank you Ma'am
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- VRM MS6, Sunlight Silver MSP
alot of DSM guys use these, I wouldn't unless you wanted it open a lot. It opens when you go into boost. having an electronic controller gives you a lot more freedom to have it loud or quite when you want. I perfer the sound of the cutout under small loads anyways, but if it opened every time I went to boost, I dont know how long I coul take that. Plus that would draw a lot of unwanted attention.BoOsTiN said:
AFaceInTheCrowd
Member
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- 2010 Subaru Legacy GT
you know i was thinking of using an electronic cutout to utilize an open wastegate dump tube. with the cutout closed, the wastegate would dump back into the exhaust system. with it open, it would go to atmosphere.
gosh, makes me wanna have this
i think my next mod, after getting the hard pipes done properly, is an exhaust cut off, i think is cheaper than expending 600$ for a full racing exhaust...and that way i can put a muffler back in my car and have a quiet baby when not racing
i think my next mod, after getting the hard pipes done properly, is an exhaust cut off, i think is cheaper than expending 600$ for a full racing exhaust...and that way i can put a muffler back in my car and have a quiet baby when not racing
Puckpimp71
Member
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- 1991 Taurus SHO, 2003 Black Mazdaspeed Protege
If I can ever make it to a meet, I'll be happy to show you mine. I love it.
