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Old 13-04-2011, 05:12 PM   #1
EV1LXR8
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Default cat converter

i have a s1 xr8 with 2 and a half inch exhaust with hollowed out cats, will this be affecting performance, fuel econ, idle, etc. seeing if its worth buying some new ones...

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Old 13-04-2011, 05:46 PM   #2
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Default Re: cat converter

it wont effect performance, fuel econ / idle etc would be very minimal.

it is however, highly illegal, and carries a 10,000$ fine.

So to answer your question, YES, its cheaper to spend a few hundred than cop that fine, and therefor worth the purchase.
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Old 13-04-2011, 05:49 PM   #3
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Default Re: cat converter

It will have an effect on noise and the smell that comes out of the pipes.
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Old 13-04-2011, 10:13 PM   #4
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Default Re: cat converter

Quote:
Originally Posted by EV1LXR8
i have a s1 xr8 with 2 and a half inch exhaust with hollowed out cats, will this be affecting performance, fuel econ, idle, etc. seeing if its worth buying some new ones...
I would buy new ones, the car is designed to have them and without them I would think its probably not running as it should. Never really looked into it though so dont know if there actually would be any detriment to performance, but the legality issue is good enough reason to have them.
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Old 13-04-2011, 11:50 PM   #5
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Default Re: cat converter

It will affect your wallet when you get caught, may be having an impact on your car too as everything is designed and tuned around having them fitted
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Old 14-04-2011, 09:58 AM   #6
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Default Re: cat converter

Don't risk the fine if you get caught. Buy some new ones.
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Old 16-04-2011, 09:44 PM   #7
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Default Re: cat converter

What does the exhaust fumes smell like when the cats have broken? Rotten egg gas by any chance?
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Old 17-04-2011, 12:32 AM   #8
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Default Re: cat converter

They smell like the exhaust but stronger
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Old 17-04-2011, 08:37 AM   #9
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Default Re: cat converter

Quote:
Originally Posted by greenguzzler
What does the exhaust fumes smell like when the cats have broken? Rotten egg gas by any chance?
Some refer to it as this yes.
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Old 17-04-2011, 10:47 AM   #10
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Default Re: cat converter

Quote:
Originally Posted by b2tf
Some refer to it as this yes.
The cat actually makes the rotten egg gas, its normal, and something to do with the high sulphur content of our petrol. Here's a link I came across in a search:
http://www.swri.edu/10light/catalyst.htm
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Old 17-04-2011, 08:24 PM   #11
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Default Re: cat converter

easiest way is youll start to notice a carbon build up on your rear bar.. thats what happened with my last car.
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Old 18-04-2011, 07:53 PM   #12
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Default Re: cat converter

Hollowed cats are illegal because of regualtions on pollution.Now with that out of the way..your car can gain decent power without them if tuned for offroad use cars. In saying that the ego sensors will have a harder time reading air fuel ratios at idle mostly because it will think the engine is leaner and will likely make the ecu run richer untuned.
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