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Lpg and cat converters 

 

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 Post subject: Lpg and cat converters
Posted: Mon Apr 02, 2007 1:19 pm 
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I was told recently not to use a ceramic core cat converter with the combination of headers and lpg but rather get a steel core cat..

Anyone know whats in the standard one?

 

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Posted: Mon Apr 02, 2007 11:17 pm 
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As far as it goes, a cat does nothing with LPG... however, according to the ADR you need it on a vehicle post Jan86, I`d go the cheapest possible option suited to your needs...(I could say don`t bother but that`d be irresponsible) :wink:

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Posted: Tue Apr 03, 2007 1:42 am 
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Well I still need the cat being a dual fuel system..

The main concern here is the extra heat of headers combined with the extra heat of running gas causes ceramic cats to deathify rather than any emissions reasons.

So a dead (melted/cracked etc) cat is mainly going to be a concern for flow.

 

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Posted: Tue Apr 03, 2007 8:53 am 
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As I said, get the cheapest one that suits your needs, and you only said gas, not dual fuel...get a standard one and you`re set to go, legally too. if it`s a falcon abd you want a bigger system, use a VN cat, bigger pipe, plenty ppl using them on Xseries with 2.5" pipes

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Posted: Tue Apr 03, 2007 9:22 am 
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The factory LPG system for E series purposely richens the mixture under deceleration and a few other conditions to lengthen the life of the CAT. From that it would seem that a straight O2 loop system could be detremental to the life of the CAT.

 

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Posted: Thu Apr 05, 2007 2:23 pm 
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Have you ever thought of just gutting the standard cat and putting a 2.5" pipe through the middle of it???

I've "heard from a friend" that it makes the car sound better and flows really good to :)

 

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Posted: Thu Apr 05, 2007 2:48 pm 
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Im actually one of those minorites that thinks a working cat converter is an important thing. I still probably use petrol 1/4 of the time after all..

 

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Posted: Thu Apr 05, 2007 9:40 pm 
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twason wrote:
The factory LPG system for E series purposely richens the mixture under deceleration and a few other conditions to lengthen the life of the CAT. From that it would seem that a straight O2 loop system could be detremental to the life of the CAT.


Did you get that info from the Tickford LPG supplement?
To me that sounds wrong as that may introduce unburnt LPG into the converter, that in turn WILL destroy it if it happens for to long.

 

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Posted: Thu Apr 05, 2007 10:26 pm 
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Yea that kinda behaviour sounds like it would promote backfiring as well...

 

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