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Sorry but I have to disagree
Posted by Jay Hassinger (more from Jay Hassinger) on Fri, 28 Dec 2001 07:55:13
In Reply to: Re: Gutting a SPG cat, SDP, Thu, 27 Dec 2001 12:36:29
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With several things.
1. Performance. I actually measured the performance after I gutted the cat. I did 3K-6K sweep on the tach with a stop watch averaged the three runs before and after. After gutting the cat the car was about 1 second quicker consistently. Conditions were the same...within the hour of the same day.
2. Backpressure being needed. That's a big fat no no with turbo cars. You need NO backpressure after the turbo. In fact no exhaust at all is ideal when talking turbo. But since we can't do that we compromise.
I have plenty of automotive engineers who are friends that agree, plus actual dyno charts showing the car with a 2.5" full exhaust, down to a 2.5" downpipe, down to open turbo. Guess what? It gained *9* hp at the same boost by going from open downpipe to open turbo right off the turbine housing. The curve looked the same with no loss anywhere.
3. That screen inside the cat. I just used a big pry-bar and scraped it out and pounded it to the hole, got some channel locks and gave a good tug. It was tough but a good gutteral grunt and it was out. :-)
I know I disagree with a lot on the board, but I'm a pisser for empiracal data and have been building turbo cars and performance cars in general for over 16 years. I'm not trying to piss anyone off, just present facts to help you get the most of of your car. :-)
posted by 24.18.134...
Posts in this Thread:
- Gutting a SPG cat, BuHuSPG, Wed, 26 Dec 2001 23:37:14
- So whats the verdict, BuHuSPG, Thu, 27 Dec 2001 23:35:00
- Re: Gutting a SPG cat, SDP, Thu, 27 Dec 2001 12:36:29
- remove it with the downpipe, dave n, Thu, 27 Dec 2001 06:43:01
- Re: remove it with the downpipe, Johann F, Thu, 27 Dec 2001 08:01:00
- So by your logic then, Jay Hassinger, Thu, 27 Dec 2001 08:47:30
- Re: So by your logic then, Johann F, Thu, 27 Dec 2001 09:50:11
- Re: So by your logic then, Jay Hassinger, Thu, 27 Dec 2001 10:50:50
- no theory here., dave n, Thu, 27 Dec 2001 16:10:07
- Re: So by your logic then, Johann F, Thu, 27 Dec 2001 12:50:33
- Well some final thoughts, Jay Hassinger, Fri, 28 Dec 2001 07:58:52
- Agree- and some, SDP, Thu, 27 Dec 2001 20:28:51
- Dunno which FI system you're referring to... but,, bazil burns, Thu, 27 Dec 2001 15:26:46
- Re: Gutting a SPG cat, chrisx, Thu, 27 Dec 2001 04:09:34
- yes but just a few considerations, Quinn S. Kurz, Thu, 27 Dec 2001 01:51:26
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