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  #16  
Old 06-06-2002, 05:14 PM
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I stand corrected on the controls comments. BUT on the issue of leaving something original, well, I think it's our duty and responsibility to modify and improve our vehicles. What fun is it to buy a car and just drive it ?? In the spirit of Tim "The Tool Man" Taylor: "I can modify that to get more POWER"
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  #17  
Old 06-07-2002, 01:08 AM
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ALong time ago I had to replace the cat on my 420SEL. I suspected a clogged cat because the car had no power. If you were to floor it, it would not go over about 50 mph unless u let off the gas and let it upshift. This was because the engine could not get over 5000 rpm. The car was also silent as could be. After many years with the new exhaust system (aftermarket), the new convertor started to deteriorate and rattle. Discusted at the idea of spending another $1000 on a cat, I guttet it instead.

As far as power is concerned, there maybe a little more. But I think it is just perceived as more power because it is a little louder and more bellowee(sp?). One thing I noticed for sure. The exhaust STINKS! Went on a road trip with some buddies, after a few miles they said they had to lead because my exhaust was so bad!! I also noticed that since i gutted the cat, I have alot more white smoke puff out of it when I start it up in the morning, and when i floor the car, it emits dark smoke. I think the cats filtered this out before. maybe there is something wrong with my motor where it keeps going thru cats, but instead of spending time and money to know, I took the easy way out. Hope this helps.
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  #18  
Old 06-13-2002, 11:56 AM
inspector1
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More on..gutting a cat

Hey Guys,

I felt obligated in the interest of science to put my 2 cents worth in...again.
Larry Bible stated that a cat emits sulpher compounds, technically not true, a cat converts HC to water ( H2O ) CO to CO2 and excess O2 to H2O, gasoline in St. Louis has the highest supher content of all gasoline in the country, this reacts only with the air (O2) in the combustion chamber to create sulpher dioxide-SO2, this will contribute to the destruction of the cat, SO2 once emitted in the exhaust, will react with rain to form sulphuric acid, ie. battery acid, also called "acid rain".
A further note, here in St. Louis, we have 1.5 million vehicles driving 50 million miles PER YEAR! emitting around 44 tons of HC, 660 tons of CO and 110 tons of Nitrous oxide compounds every year, and thats the CLEAN CARS, one city, one state, all that crap floats around the world.

Yes, cats are important
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  #19  
Old 06-13-2002, 05:57 PM
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I have decided to leave mine alone. I can't see any advantage to modifying thse pre cats.
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  #20  
Old 06-13-2002, 10:51 PM
TANK
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Cats restrict power: Proven difference.

Back in my hot rod days, On my 94 Z28, I removed the cat and the car FELT noticeable faster.

However, I never took seat of pants or sound as seriously as most. I would always take the car to the track after a change not to race people but to test/see if it REALLY made a difference. In this scenario it turns out the seat of pants indicator was correct. After numerous runs all thing being equal, I consistantly ran 2 tenths better during the quarter mile run with the cat REMOVED(13.8's to 13.6's). About 2wice as loud though. Great on a american v8, not so sure it would sound good on a 6cyl or diesel although a turbo diesel may not be as loud as normally aspirated diesel..

Basically, in the 94' Z28 5.7liter eng. with 275 factory horsepower this equated to approx 20hp difference based on quarter mile times and other factors. I do not know if all cats are made equal and on smaller engines there may be quite minimal difference and too much loss of low end to even matter. I guess on that car I didn't feel much loss in low end considering it put out 325ft pds torque @ 2000 rpm in the automatic.
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  #21  
Old 06-13-2002, 11:00 PM
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I can see that there would be a difference by modifying the main cat. I've done that (years ago, I think the statue of limitations has run out by now), I was referring to the two small pre cats near the engine. Someone has suggested that they serve the purpose of "cleaning" a cold (rich) motor. I don't see any benefit with tinkering with those.
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  #22  
Old 06-13-2002, 11:16 PM
TANK
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I think you are correct Cap. For me, the only way to really know for sure was to try it out. The Mercedes is much better engineered than the chevy in my o, so I wouldn't fool with it to much although for the real speed enthusiast you could probably make it go faster but prob also sacrafice some other benefit..
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  #23  
Old 06-13-2002, 11:34 PM
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The truth of the matter is, I'm approaching geezer age, so comfort and dependability in the daily driver is more important than performance. I still have my toy to play with when I want to get my heart rate up. " I love to hear 7000 rpm, but not on a regular basis anymore!!
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