These cats look interesting...
03-17-2005, 08:15 PM
#1
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These cats look interesting...
They are in the RS2 section of the website, but they don't look like they would be from an RS2.
<img src="http://www.totsteile.ch/gebrauchtteile/rs2/karosserie_dichtung_auspuff/kats.jpg">
Does anyone know what they are from, or if they flow better than stock, B4 cats?
<img src="http://www.totsteile.ch/gebrauchtteile/rs2/karosserie_dichtung_auspuff/kats.jpg">
Does anyone know what they are from, or if they flow better than stock, B4 cats?
03-17-2005, 08:24 PM
#2
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Also found these on the same website...
<img src="http://www.totsteile.ch/tuning/bilder/sportkats_rs2_1.jpg">
<img src="http://www.totsteile.ch/tuning/bilder/sportkats_rs2_2.jpg">
And here's the link..<ul><li><a href="http://www.totsteile.ch/index.html">http://www.totsteile.ch/index.html</a</li></ul>
<img src="http://www.totsteile.ch/tuning/bilder/sportkats_rs2_2.jpg">
And here's the link..<ul><li><a href="http://www.totsteile.ch/index.html">http://www.totsteile.ch/index.html</a</li></ul>
03-17-2005, 10:29 PM
#5
Look closely at their inner core material....
They have something like 100 cells per inch, where US cats have 300 cells per inch. Given this, they will flow better than most US cats. However they will allow more emission gasses to pass as well, possibly not allowing your car to pass emission testing? ;o)
03-18-2005, 04:39 AM
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Mike, the cell count doesn't effect emmissions testing
We can take one of our 500 cell per in (cpi) cats and dip it lightly and it will fail emmissions every time. Similarly, I can take a 250 cpi (or 100, or 50, etc) and dip it heavily and it will pass emmissions every time.
There is a formula for determining how much of the catalyst needs to be bonded to the matrix (core) in order to have the cat clean up enough of the emissions gasses.
We dip a cat differently for a 4L engine then we do a 5.8L...but both part numbers use the same matrix core.
The key to understand, though, is that the more cells per inch, the more precious metals you have to use when dipping...this increases the cost of the catalytic converter. The reason you may have seen low cell count catalytic converters failing emissions is because either a) they were insufficiently coated or b) they were coated for a smaller displacement then what they're being used for.
Whether or not a cataltyic converter will pass an emissions test has everything to do with how the matrix was dipped, not what shape/cpi the core is.
-Dave
P.S. for what it's worth, judging by the photos both cats have a 300-350cpi count. A 100cpi cat would look vastly different.
There is a formula for determining how much of the catalyst needs to be bonded to the matrix (core) in order to have the cat clean up enough of the emissions gasses.
We dip a cat differently for a 4L engine then we do a 5.8L...but both part numbers use the same matrix core.
The key to understand, though, is that the more cells per inch, the more precious metals you have to use when dipping...this increases the cost of the catalytic converter. The reason you may have seen low cell count catalytic converters failing emissions is because either a) they were insufficiently coated or b) they were coated for a smaller displacement then what they're being used for.
Whether or not a cataltyic converter will pass an emissions test has everything to do with how the matrix was dipped, not what shape/cpi the core is.
-Dave
P.S. for what it's worth, judging by the photos both cats have a 300-350cpi count. A 100cpi cat would look vastly different.
