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Old 04-16-2012, 02:49 AM   #1
joec wrx
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Default Hi-flow cat gone bad

I went to have my car protuned the other day and my tuner said my car was lagging due to a bad cat. I went to have the car checked, sure enough there was a crack inside. Now I'm running catless and going for a re-tune tomorrow. Could a bad cat cause power loss? Turbo lag? My tuner didn't want to tune my car until I got it fixed.
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Old 04-16-2012, 02:37 PM   #2
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Quote:
Originally Posted by joec wrx
I went to have my car protuned the other day and my tuner said my car was lagging due to a bad cat. I went to have the car checked, sure enough there was a crack inside. Now I'm running catless and going for a re-tune tomorrow. Could a bad cat cause power loss? Turbo lag? My tuner didn't want to tune my car until I got it fixed.
what happens when a sink or tub is clogged?
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Old 04-16-2012, 03:41 PM   #3
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Lol I get the point
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Old 04-16-2012, 08:02 PM   #4
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Power loss, yes, but how does this cause turbo lag if it is behind the turbo?
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Old 04-16-2012, 08:16 PM   #5
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Turbo needs exhaust -> flow <- to spool, clog means no flow...
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Old 04-16-2012, 10:18 PM   #6
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That makes sense. To get gases through the turbo to spool quicker, it has to be able to flow out just as quick.
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Old 04-17-2012, 02:35 PM   #7
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yes exactly, running cats on a turbocharged car is quite redundant
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Old 04-17-2012, 02:59 PM   #8
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You'll see better results without a cat, high flow or not.
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Old 04-17-2012, 02:59 PM   #9
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Quote:
Originally Posted by brew02wrx
yes exactly, running cats on a turbocharged car is quite redundant
what?
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Old 04-17-2012, 03:43 PM   #10
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Quote:
Originally Posted by nhat

what?
I think they mean that cats restrict flow, so running no cat at all is better.
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Old 04-17-2012, 03:54 PM   #11
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the NA honda guys thought i was nuts when i told them i was catless. told me i needed some source of back pressure. ha because a turbine wheel doesnt create sufficient back pressure lol. catless on a turbo car is basically the only way to go!
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Old 04-17-2012, 04:23 PM   #12
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Quote:
Originally Posted by WhiteBgeye02 View Post
the NA honda guys thought i was nuts when i told them i was catless. told me i needed some source of back pressure. ha because a turbine wheel doesnt create sufficient back pressure lol. catless on a turbo car is basically the only way to go!
I would rather not kill the environment for 5HP, so I have the Perrin high flow cat.
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Old 04-17-2012, 04:38 PM   #13
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fair enough^
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Old 04-17-2012, 08:06 PM   #14
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Quote:
Originally Posted by Ernest

I would rather not kill the environment for 5HP, so I have the Perrin high flow cat.
exactly.

and redundant wasn't used correctly.
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