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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 10-10-2007, 10:16 AM   #1
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Question race vs sport cat

hey guys
whats the difference between sport and race cat's???
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Old 10-10-2007, 10:26 AM   #2
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The names...

But really you can get a cat with as low as 100 cells. 200 and below are generally considered race, 300-200 sport and more that 300 regular... from what I have seen.
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Old 10-10-2007, 10:33 AM   #3
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cells???
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Old 10-10-2007, 10:36 AM   #4
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prob how much they actually function vs appear to have a cat on your car...
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Old 10-10-2007, 10:38 AM   #5
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Ok Still Lost Sorry Guys
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Old 10-10-2007, 10:39 AM   #6
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If you look at a Catalytic converter, it is just a honeycomb of "cells". Think of it like a screen on a screen door, with all the little holes in it. Only the screen is about 8-10" thick. So each "hole" or "cell" acts like a tube.


The exuast gets passed through this thick honeycomb screen, and the chemicals inside the honeycomb react with the exhaust to "clean" it.

The number of "cells" and the size of them help determine if it is a sport/race cat.
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Old 10-10-2007, 10:42 AM   #7
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Good info. I had no idea on how that classification was reached.
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Old 10-10-2007, 10:43 AM   #8
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so is one more legal than the other or makes a better sound over the other???
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Old 10-10-2007, 10:52 AM   #9
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I don't think there is generally a rule for how one cat called one thing is going to sound over a different cat called by a different term.
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Old 10-10-2007, 10:55 AM   #10
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In terms of outright flow, there is probably little difference...I've heard that race cats handle more abuse...although this is just anecdotal.
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Old 10-10-2007, 11:05 AM   #11
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so no difference in sound??
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Old 10-10-2007, 11:26 AM   #12
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A race or sport cat is usually a larger diameter, and thus flows more. Because it flows more, it probably muffles the sound less than a regular restrictive cat.


The catalytic converters that most parts stores carry are 2.25" max on the inlet/outlet, and expand up to 2.75" in the middle for the honeycomb.

A sport or race cat will have a 3" inlet/outlet or larger, and expand to me much wider in the center section.

The honeycomb of the cat does take up volume, and as such, restricts airflow. By making the honeycomb section larger, the increased volume of space counters the restriction that the volume of the honeycomb makes. So actual volumetric space for air to exist in a sport/race cat is more than in a regular cat... thus allowing it to flow more.


Any way you go with a cat, the cat will do some minor restriction on the flow, and quiet down the exhaust. If you want a louder ehaust, just remove the center muffler/resonator.
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Old 10-10-2007, 11:27 AM   #13
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Quote:
Originally Posted by jtviggen View Post
so no difference in sound??
None whatsoever, all cats sound exactly the same.
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Old 10-10-2007, 12:31 PM   #14
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How many cells does the stock cat have?
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Old 10-10-2007, 12:54 PM   #15
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Race cats often have metal cores, so they don't melt like this ;]

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Old 10-10-2007, 01:56 PM   #16
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Just go without a cat, i think its a better option
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Old 10-11-2007, 03:05 AM   #17
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Quote:
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Just go without a cat, i think its a better option
What about our beautiful planet?

The gains of running without a CAT are far out weighed by the drawbacks, even without considering mother earth....and she'll be pissed!!!
Robert
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Old 10-11-2007, 04:41 AM   #18
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would i need the ver 2 dp from gs and would i need the space for the wide band o2 sensor??? for a viggen
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Old 10-11-2007, 04:45 AM   #19
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Depends....what are your goals? Lots of people run various DP's with sport cats, race cats or no cats....the GS v2 DP is certainly the sweetest one. I have a homegrown 3" DP with a 3" sport cat...it works great. It's not pretty, though.

Wideband is necessary if you are going to be doing some serious/custom work to the car. Otherwise it's icing.
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Old 10-11-2007, 05:22 AM   #20
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Quote:
Originally Posted by RBatsch View Post
What about our beautiful planet?

The gains of running without a CAT are far out weighed by the drawbacks, even without considering mother earth....and she'll be pissed!!!
Robert


Quote:
# Catalytic converters are "estimated" to account for 50% of total nitrous oxide (dinitrogen oxide, 'laughing gas') emissions to atmosphere. While N2O emissions in these concentrations are not harmful to human health, it is a potent greenhouse gas, accounting for around 7% of the overall greenhouse effect despite its small concentration in the atmosphere. The California Air Resources Board is investigating this issue, and will introduce legislation to address it if necessary.
# The manufacturing of catalytic converters requires palladium and/or platinum; a portion of the world supply of these precious metals is produced near the Russian city of Norilsk (about 15%), with significant negative environmental effects due to the lack of environmental protection legislation. [2]
http://en.wikipedia.org/wiki/Catalyt...ter#Criticisms
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