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Old 11-03-2010, 11:24 PM
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test pipe

so does anybody know if test pipe throw a cel?
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Old 11-04-2010, 01:56 AM
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Re: test pipe

yes it will you need to get a o2 simulator. because you wont have the back-pressure.
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Old 11-04-2010, 08:30 AM
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Re: test pipe

That is about the dumbest reply I've seen in awhile. Back pressure has nothing to do with it. Or anything, for that matter. And I have no idea what the hell an "o2 simulator" is.


To the OP: A test pipe will cause your car to throw a CEL. This is because of how the o2 sensors work. The first (primary) o2 sensor measures the exhaust stream before the catalytic converter, and controls your Air/Fuel (A/F) ratio. The second (secondary) o2 sensor is there to make sure the catalytic converter is working properly.

If you hooked up an oscilloscope to a primary o2 sensor, you'd see it moving up and down slightly (think EKG) this is caused by flucuations in the exhaust stream. A leaner mixture (more air) will cause the o2 sensor to read low voltage, and a richer (more gas) mixture will cause it to read a higher voltage. Since it is exhaust fresh from the collector, it will read a steady voltage (for example, 4v) but once the exhaust stream enters the catalytic converter, the excess gasses (NOX, NO2, CO2, etc.) mostly get burnt off. Therefore, the secondary o2 sensor reads basically no voltage, with little if any fluctuation. This means the catalytic converter is working properly, and that is the secondary o2 sensors job.

If you take the catalytic converter out, however, the secondary o2 sensor would read voltage the same as the primary o2 sensor. This lets the ECU know that the cat is not doing its job, and it throws a CEL.



But there is a way around this. Its an o2 sensor mod. I actually have a DIY of how to do it, but mine isn't as detailed as it prolly should be and lacks pictures. Basically the concept is that if the secondary o2 sensor is in the exhaust stream without a cat, it will throw a CEL. Solution? Take the secondary o2 sensor out of the exhaust stream. This is accomplished by using some spark plug ports or extenders or whatever they're called, and basically fabbing up an extension for the o2 sensor port hole, effectively taking it out of the exhaust stream. If you look at my DIY or search 'o2 sensor mod' online, you'll be able to get a better idea of what I'm talking about. It's a pretty easy mod, and takes very little time at all. The problem usually lies in getting the cat off in the first place, because the bolts are usually rusted the fck on.


Pros of a test pipe: Freer flowing exhaust, cheap, slightly deeper sound.
Cons of a test pipe: Will fail emissions testing, makes your exhaust smell a bit more, pollutes and pisses off the tree huggers.

Cost of a test pipe: Mine was about $30 shipped.
Cost of a high flow cat: $100-150.
Cost of a stock cat from advanced auto: $130
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Last edited by havikprelude; 11-04-2010 at 09:15 AM.
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Old 11-04-2010, 08:39 AM
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Re: test pipe

Dont get a test pipe. I just feel like its not worth it at all. Get a high flow cat.

Also please search around next time. This is a VERY basic question that you couldve found the answer to in like 1 min
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Old 11-04-2010, 10:48 AM
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Re: test pipe

atleast some people understand the function of o2 sensors.
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Old 11-04-2010, 11:17 AM
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Re: test pipe

man havik just look up what an o2 simulator is. it makes it so you can take out your o2 sensors nd not throw codes. nd ya sooooooo sorry i dont know how o2 sensors work... like thats the last of my worrys
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Old 11-04-2010, 11:20 AM
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Re: test pipe

Ok, buy something that costs $40 or make an o2 sensor mod which costs about $4.


Yeah...and if you don't know how stuff works, you prolly shouldn't be giving advice on the subject.
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Old 11-04-2010, 12:26 PM
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Re: test pipe

thnaks guys i figured it would do that.
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Old 11-04-2010, 03:05 PM
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Re: test pipe

Lol. O2 simulators are pretty common. They are better for big power applications not usually seen on basic street vehicles, where the ecu compensates differently if the o2 sensor sees a different reading.

I hate my testpipe. I only got it because my cat was clogged and I was strapped for cash. You get MINIMAL is any power gains at all over a high flow- it smells and ALL test pipes will have that annoying raspiness.

High flow ftw.
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I was only able to read the first couple lines cause I'm fukin hammered. but my suggestion is to just drink more. I drink like everyday. and I love life. except when I'm not wasted. guess that makes me an alcohlkx but idc cause I'm drunk
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Old 11-04-2010, 03:38 PM
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Re: test pipe

I don't see what annoying raspiness everyone talks about. Mine sounds just like stock, maybe a fuzz louder. Thats it.
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Old 11-04-2010, 03:58 PM
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Re: test pipe

Quote:
Originally Posted by havikprelude View Post
I don't see what annoying raspiness everyone talks about. Mine sounds just like stock, maybe a fuzz louder. Thats it.
While I don't doubt that you might be right in your instance, have you been in another car driving behind yours to hear? I don't hear any raspiness when I'm in the car, but outside as someone else drives it, it's horrible.
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I was only able to read the first couple lines cause I'm fukin hammered. but my suggestion is to just drink more. I drink like everyday. and I love life. except when I'm not wasted. guess that makes me an alcohlkx but idc cause I'm drunk
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Old 11-04-2010, 04:29 PM
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Re: test pipe

Now that you mention it, no I haven't. No one else has ever driven my car so...
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Old 11-04-2010, 04:50 PM
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Re: test pipe

Yours probably isn't near as bad as mine, I occasionally can hear it with my windows down if I romp on it from like 2000 rpm. Otherwise nothing. But when my wife drove it and got on it and I was behind her it was horrible lol.
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I was only able to read the first couple lines cause I'm fukin hammered. but my suggestion is to just drink more. I drink like everyday. and I love life. except when I'm not wasted. guess that makes me an alcohlkx but idc cause I'm drunk
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Old 11-04-2010, 05:05 PM
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Re: test pipe

honestly if your driving around a stock honda, leave the ****ing cat on please! your car does sound like **** when its straight piped, thats just a simple fact. most 4 bangers do. unless of'course you've got a boxer or turbo motor.
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Old 11-04-2010, 05:07 PM
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Re: test pipe

Too late lol
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Old 11-04-2010, 05:10 PM
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Re: test pipe

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Originally Posted by 2.2Lude View Post
honestly if your driving around a stock honda, leave the ****ing cat on please! your car does sound like **** when its straight piped, thats just a simple fact. most 4 bangers do. unless of'course you've got a boxer or turbo motor.
Agreed. Lol. Like I said I only did it because my cat was clogged as fuc*. Magnaflow coming soon.

Turbo motors ftw ;)
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I was only able to read the first couple lines cause I'm fukin hammered. but my suggestion is to just drink more. I drink like everyday. and I love life. except when I'm not wasted. guess that makes me an alcohlkx but idc cause I'm drunk
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Old 11-04-2010, 05:15 PM
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Re: test pipe

good choice. ive got a 2.5 magnaflow high flow waiting to go on along with a tri-y header, full exhaust. oh and a h23vtec Si-R motor
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Old 11-04-2010, 05:18 PM
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Re: test pipe

Like I've said previously - a test pipe was worth an entire hp at the wheels (as in 1hp increase) over the stock cat. It's not worth it. And we do not need yet another thread on this.
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