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Old 05-04-2003, 19:57   #1 (permalink)
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Question Catty's pushed back (illegal)

Anyone have there exhaust system done on the car and had there cats pushed back from original position.
I know this is illegal but it actually gives you more of an increase i hear

Is this true?
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Old 05-04-2003, 20:04   #2 (permalink)
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Can't see how it could be true. Whether you have 2.5" diameter cat at the end of the extractors or halfway down the car, it is still a 2.5" 'restriction'. Perhaps they don't work properly further away from the motor? Again can't see how this would affect performance as the job they do shouldn't affect the flow rate - the fact that they are there does this!

And mine are not in their original position - they're probably close, but not exactly as I now have Tri-Ys, instead of the standard old manifold.
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Old 05-04-2003, 21:56   #3 (permalink)
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they move them back to make the pipe length of the headers longer. Which to my understanding is better for torque. The thing with moving back though is they take longer to warm up which can mean you produce more emissions at lower engine temps.
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Old 05-04-2003, 22:33   #4 (permalink)
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hi flow cats!

Of cause the other alternative is to "hi-flow" you cat. The tool most commonly used for this performance "modification" is the humble broom handle thrust repeatedly into the ceramic of the cat . lol

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Old 05-05-2003, 00:38   #5 (permalink)
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hmm -if you like being fined $20,000 for the above mod then i suggest you try it

yes - moving the cat back a little means it takes a bit longer to heat up, having a small effect on emissions, but i really doubt that any cops/the rta would notice a few cms difference.
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Old 05-05-2003, 01:45   #6 (permalink)
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My extractors are ceramic coated inside and out, and the cat is further back, but as the heat is traped in more from the ceramic coating I belive this counter acts the problem.

Also as exhaust gasses cool down the velocity degreeses, so having the cat further away poses less of a resriction.
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Old 05-05-2003, 05:44   #7 (permalink)
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What's the situation if you have headers that end in a 2.5" cone, with high flow cats (not the broom handle variety, hopefully) that are 2.5" diameter that continue as twin 2.5" pipes joining into a single 3" system. Surely the flow in this type of system would be most restrictive where the pipe becomes the single 3"? The cats should make no difference to performance as they are the same diameter as the two into one system. Or am I missing something here (besides a brain - lol).
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Old 05-05-2003, 06:16   #8 (permalink)
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Also as exhaust gasses cool down the velocity degreeses, so having the cat further away poses less of a resriction. [/B][/QUOTE]

Incorrect!! The hotter the gases the thinner it is & hotter the cat the better = less restriction. Cats are further back due to long tube extractors. Realy for "mild"[as in std cam heads] steet use a good 1 5/8 shorties would be better as in the States, but we tend to use long tubes here, a carry over from the past imo..
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