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I stand...or...sit rather...corrected. I think what... Posted by David in Tallahassee [Email]  (#970) [Profile/Gallery]
(more from David in Tallahassee) on Tue, 28 Aug 2007 20:41:19
In Reply to: Re: ALL gasoline powered internal combustion engines..., Justin VanAbrahams  [Profile/Gallery]
, Tue, 28 Aug 2007 19:42:17
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I was really trying to get at, despite my obvious lack of in-depth knowledge on the subject, is that engines and catalysts have become better playmates over the years.
I hear what you are saying about convertor technology but I also know for a fact, that removal of a modern catalyst will make a smaller difference in the engines output, on a percentage basis, than removal of one from the era I mentioned. (Or to put it another way, if it doesn't, then catalyst removal would be the best kept secret of the underground tuning world.) The catalyst alone on a 1979 930 Porsche will account for 20+ HP. Dyno proven. That's about 7% on an otherwise stock car. No other changes. Back in the day, selling "test pipes" was a pretty decent business all by itself. If no advancements have been made, then there would be nearly 20HP to be had by simply eliminating the catalyst on an otherwise stock 9-5 Aero. I highly doubt that dyno results would bear out that kind of gain.
My point about OBDII had nothing to do with OBD. It was simply a line of demarcation drawn somewhere around the time that removing catalysts became less fruitful for performance enhancement.
Also, though a catalyst may reduce multiple facets of an engines emissions it is not eliminating them. It is merely reducing.
I live in Florida and it's very possible that our inspection system is not nearly as stringent as others around the country. (Here, each county chooses whether to inspect or not -- Most of the counties don't do it.)
For many years the trick in Porsche tuning was to "gut" factory cat pipes to pass visual but the cars burned clean enough to pass the sniffer with no cat present. Obviously this would not be true of every car but I have first hand experience it is true of some. (As much as I hate to admit it.)
You clearly have a far superior understanding of the fundamentals than I so I would defer totally to your knowledge and agree with you everywhere that my own personal experience doesn't deviate.
Great information though man. I learned something and that males me feel good right at the end of the day!
D-
, Tue, 28 Aug 2007 14:14:54, Tue, 28 Aug 2007 14:45:39, Tue, 28 Aug 2007 19:42:17, Tue, 28 Aug 2007 20:41:19 <-- Viewing This Message, Wed, 29 Aug 2007 07:25:12, Tue, 28 Aug 2007 23:13:25, Wed, 29 Aug 2007 05:42:28, Tue, 28 Aug 2007 21:21:56
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