Test pipe swap for cat
#1
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Test pipe swap for cat
I live in Colorado and have a 2000 civic si. The car came with a full exhaust system including a cat. There are no emissions laws here and want to put a test pipe/resonator in place of the cat. My question is regarding the o2 sensor on the cat.
If I buy a test pipe with v a bung for the o2 sensor will my CEL go off??? Are resonators designed to work properly with stock ecu???
If I buy a test pipe with v a bung for the o2 sensor will my CEL go off??? Are resonators designed to work properly with stock ecu???
#2
Re: Test pipe swap for cat
I live in Colorado and have a 2000 civic si. The car came with a full exhaust system including a cat. There are no emissions laws here and want to put a test pipe/resonator in place of the cat. My question is regarding the o2 sensor on the cat.
If I buy a test pipe with v a bung for the o2 sensor will my CEL go off??? Are resonators designed to work properly with stock ecu???
If I buy a test pipe with v a bung for the o2 sensor will my CEL go off??? Are resonators designed to work properly with stock ecu???
90-93 Honda Accord N1 Style 2.5" Performance Catback Exhaust - Titanium Tip
If my memory serves me properly the o2 sensor on my 1991 honda accord lx is on my exhaust manifold, and it never threw a code.
Don't know about yours, though.
#3
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I have dc headers, new cat, and dc cat back exhaust system. I'm gonna put a test pipe into the cat position. But my car has 2 o2 sensors. One is on the cat. The test pipe I'm ordering has a bung for that o2 sensor. I'll see what happens.
#4
Re: Test pipe swap for cat
P0420 inefficient catalyst code. If the cat is not bad you won't see any power gain from putting a test pipe on (unless you have a built or turbo engine).
#5
Re: Test pipe swap for cat
Removing 90% of my exhaust system improved performance in terms of throttle response and acceleration. Except gave me some gross MPG. COuld of just been my imagination, although my RPMs ran a little bit higher oddly, I think it was getting too much air.
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Because I ran straight pipe on my modified d16y8 (non turbo) and I noticed immediate improvement in throttle response.
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#8
Re: Test pipe swap for cat
On my first stock h22a the difference on the dyno between a test pipe and stock cat was 1hp. repeated more than once. That was even using the stock ACCORD cat, which was for a 125 hp engine compared to the 200hp h22a.
On engines that are near stock there is minimal gain, unless louder is considered a gain.
On engines that are near stock there is minimal gain, unless louder is considered a gain.
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Re: Test pipe swap for cat
On my first stock h22a the difference on the dyno between a test pipe and stock cat was 1hp. repeated more than once. That was even using the stock ACCORD cat, which was for a 125 hp engine compared to the 200hp h22a.
On engines that are near stock there is minimal gain, unless louder is considered a gain.
On engines that are near stock there is minimal gain, unless louder is considered a gain.
I had a 1990 Acura RS with a 1996 gsr swap, already had a test pipe installed, when i switched to a cat I noticed zero difference. If anything the cat seemed more responsive, which is weird because I was expecting the opposite.
#10
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Re: Test pipe swap for cat
OP, if the cat works and your engine is stock or close to stock, just leave it be. If you want something high-flow you can get Mgnaflow spun-metallic core catalysts for less than $100 on eBay. I know these are performance cars and environmental quality is not the first concern but it hurts nothing to have the cat there.
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