Toymods Car Club Inc: Tech & Conversions => Catalytic converters a restriction or not?

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SUPRAGTE
Forums Junkie

Location:
North Sydney
Registered:
May 2002

Re: Catalytic converters a restriction or not?	Fri, 27 September 2002 23:31

Well i have no doubt in the world they pose a restriction. I just wanted to see if others weren't as naive as some. I put my car on the dyno before the last dyno day and had 270rwhp. It was ok but you could hear something choking the car in the exhaust. It's a 3inch custom made job with mandrel bends custom dump pipe(the factory ct26 is crap) and straight through muffler. It has a proper 3inch hi-flow cat. We decided that it could only be the cat causing a restriction so we removed it and put in a straight pipe temporarily. We had to re-adjusting the a/f ratios because the car was flowing so much better it ran leaner. This would indicate to anyone right there that it is definitely posing a restriction. So i knew the next power run would definitely be a good increase. Well, 270rwhp>>>>>300rwhp. A very healthy increase, and no ignition timing was added which is where big hp increases can normally be seen. Thats enough for me, also the fact that by simply looking at it will tell you when a 3lt engine with 14 pounds of boost at 6000 rpm is pumping so much air it will be a restriction. When you have your car flowing air really really well, the smallest restriction will become a massive restriction when the rest is flowing so well. Also i might add my cat is in perfect condition, no blockages etc. On a standard car you might not see much of a difference but there would be some. [Report message to a moderator]

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