What to expect after removing catalytic converter?
Gents,
I needed to pull the header to get it welded--the EGR tube fitting cracked. While I had it out, I decided to inspect the cat. The metal spiral core had separated from the case and was fairly loose inside. I had the core removed and I've remounted the empty cat. I drove it a short distance to work--I wanted to make sure the header welding was okay. AFRs seemed fine around town, so I took it on the highway on the way home. Nothing out of the ordinary. Is there anything I should expect, like lower boost levels, from running without the cat? Do I need a retune for track use? Should I just get another hi-flow cat? Thanks, |
I wouldn't expect a change in boost level, especially with a blower. Keep an eye on AFR's under acceleration. Reducing exhaust restriction should pick up some power and lean out your tune. You may need to add a little fuel to the top of your VE table.
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its gonna sound nasty/raspy and stink a little
otherwise no issues. |
Originally Posted by 18psi
(Post 1356948)
its gonna sound nasty/raspy and stink a little
otherwise no issues. |
Expect to save 15% or more by switching to Geico.
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Originally Posted by poormxdad
(Post 1356962)
It sounds stupid. Would I be better off with a new high flow cat or a straight pipe?
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Adding a resonator... or a turbo... will help the rasp a lot.
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It sounds like a garage door spring being hit by a clown with a maraca.
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Originally Posted by poormxdad
(Post 1356988)
It sounds like a garage door spring being hit by a clown with a maraca.
That just made a little bit of expensive scotch go through my nose. Burns like hell, in case you were wondering. What does the rest of the exhaust system look like? |
Originally Posted by Joe Perez
(Post 1356995)
That just made a little bit of expensive scotch go through my nose.
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Originally Posted by thumpetto007
(Post 1357007)
What were you drinking? I like scotch.
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Sorry, just a 15 year Glenlivet.
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No love for the Lagavulin 16?
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Haha good stuff! We are all manly men. We drink scotch and drive silly little cars. We know we are men, we dont need to prove to the world!
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Originally Posted by Joe Perez
(Post 1356995)
: What does the rest of the exhaust system look like?
Although I'm partial to anything from The Macallan or Laphroaig, I have recently been enjoying Alberta Blended Rye Whisky Dark Batch from Canada. Just a little sweet. |
Originally Posted by psyber_0ptix
(Post 1357091)
No love for the Lagavulin 16?
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Originally Posted by poormxdad
(Post 1357184)
(...) and a Borla Pro something muffler.
Most of the exhaust systems that Enthuza builds use straight-through mufflers, and the Borla Pro is one of those. These mufflers are basically just a huge glasspack- they do not have any internal baffling. This is ideal for turbocharged engines, since the turbo itself happens to be a very good muffler. But for supercharged or naturally-aspirated engines, they're not much better than an old-school cherry bomb in terms of quieting the high frequencies. |
Originally Posted by Joe Perez
(Post 1357592)
Well there's your problem.
Most of the exhaust systems that Enthuza builds use straight-through mufflers, and the Borla Pro is one of those. These mufflers are basically just a huge glasspack- they do not have any internal baffling. This is ideal for turbocharged engines, since the turbo itself happens to be a very good muffler. But for supercharged or naturally-aspirated engines, they're not much better than an old-school cherry bomb in terms of quieting the high frequencies. You want the bestest quietest high flow setup? big maggie with a cat. done I learned a long time ago that resonators don't quiet down an exhaust. I've gone as far as running 2 21" resonators (think about that for a second), and it still wasn't "quiet". you want a big, thick, (that's what she said) muffler. the bigger in girth, the better (again, what she said) |
There's a difference between a huge resonator and a baffled muffler.
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Just install some whistle tips and win. |
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