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post #1 of 7 (permalink) Old 08-19-03, 07:10 AM Thread Starter
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Question Cat too far from extractors?

G'day all,

I went to an exhaust place today to get a new lukey muffler and the head guy there wanted to hoist me car up to check it out. Anyway, he was surprised with my catylitic convertor being so far from the engine/extractors. He said this would throw my oxy sensor out of wack and make my ride run rich (funny he said that coz my ride DOES blow black crap). Check this photo out and see wat u think. Any opinions/ideas would be helpful thanks.

Cheers,
Paul

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post #2 of 7 (permalink) Old 08-19-03, 07:21 AM
donuts2001
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Re: Cat too far from extractors?

wtf would your oxy sensor care how far away your cat is? Some of these mechanics are so stupid it's beyond belief.

Having said that, your cat is pretty far back and this can cause problems emissions wise because it has to be close enough to the front of the exhaust to heat up enough to work as a catalyst. May cause bad emmissions, but will not impact on how your engine runs.
 
post #3 of 7 (permalink) Old 08-19-03, 07:46 AM Thread Starter
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Re: Cat too far from extractors?

Thanks. I'd better turn my brain on next time. I've had alot of conflicting solutions to problems from mechanics. Having said THAT, does anyone have a clue as to why my car is STILL running rough as guts? ei: stalling only when i slow down sharply. Oxy sensor new and working, temp sensor working, MAP working, throttle body clean as a whistle. could it be an elec fault with the trans??

Oh, and donuts2003, thanks and should i have the cat moved closer do u think?

Paul

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post #4 of 7 (permalink) Old 08-19-03, 10:38 PM
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Re: Cat too far from extractors?

I mounted my cat right at the extractor flange. As for the running rich thing, check MAP hoses for leaks - a common problem.

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post #5 of 7 (permalink) Old 08-19-03, 10:51 PM
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Re: Cat too far from extractors?

My cat was mounted a fair way back on purpose by Bruce from Charlestone Exhaust, he claimed that there is a few KW to be had by giving it some distance.
When it was done, it did feel slightly better at higher revs, but this wasn't verified with dyno tests, so I could be full of it.

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post #6 of 7 (permalink) Old 08-20-03, 02:38 AM
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Re: Cat too far from extractors?

Some cars have a "before" and "after" the cat oxy sensors, maybe that was what he was thinking.

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post #7 of 7 (permalink) Old 08-21-03, 06:08 AM
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Re: Cat too far from extractors?

I agree with Donuts.WTF is he advising. Give him my number and I will put the dumb *unt in his place. Cat or no cat, the oxy sensor will work fine. Next time you see him just tell him Turbotrana said that this exhaust guy is a dumb *unt.
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