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Topic: catalytic converter

in Forum: All Vettes Discussion


catalytic converter

Posted: 10/2/07 8:04pm Message 11 of 18
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Lanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 828
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
thanks anyway dave. don't even know if it would fit the 90 as the inlet is 3". here is an update though. i have a feeling that this situation has happenned before to one of the POs.  I picked up the direct fit converter after work and after having a cup of coffee with wife went out and started to work on replacing it.

took it out of box and matched it up against the one that's in there and to my surprise the converter itself is almost twice the size as the one in there. the overall length is the same from end to end. so maybe this will be my high flow converter putting in the right size.

the reason why i think this has happenned before is number one the size difference and whoever installed it, had a clamp on the front and only welded the the bottom half of it  and was not  even a  good  welding job.  i kind of figure  they used the cheapest one they could find and never realized the secondary ground strap was missing from the distributor  so after a while the problem arose again except this time i had the car and no knowledge of it.

hopefully after all the aggravation this caused it will be the end and it wil be running as it should. thanks for everyones thoughts and help. will let you guys know how i made out when i get it done.

dave



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catalytic converter

Posted: 10/7/07 3:55am Message 12 of 18
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baton rouge, LA - USA
Joined: 8/12/2006
Posts: 391
Vette(s): 1981 dark metallic blue, dark doeskin leather interior, mirrored glass T Tops, 330hp/350ci GMPP crate engine, billeted aluminum serpentine system, Dewitts with dual spalls
I am going to ask a potentially dumb question.  Does your exhaust smell alot worse with the cats cut out? 
 
I cut mineout and the exhaust coming off the only vette I have ever owned smells horrible.  I am thinking about adding new converters eventhough our state does not mandate them in my year vehicle.
 
Do you folks smell like exhaust after yo have driven your vette?
 
thanks, gurtz



catalytic converter

Posted: 10/7/07 6:45am Message 13 of 18
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Sebago Lake, ME - USA
Joined: 2/15/2007
Posts: 964
Vette(s): 1978 Silver Anniversary L82 4spd (M21) Red Leather. Pace Car is in the hands of a new caretaker.
[QUOTE=gurtz]I am going to ask a potentially dumb question.  Does your exhaust smell alot worse with the cats cut out? 
 
I cut mineout and the exhaust coming off the only vette I have ever owned smells horrible.  I am thinking about adding new converters eventhough our state does not mandate them in my year vehicle.
 
Do you folks smell like exhaust after yo have driven your vette?
 
thanks, gurtz
[/QUOTE]

I think we have just gotten use to the smell of newer cars with cats and whatever else they do to them with all that crap under the hoods.
My sure does smell different, but the cats where in a box behind the seat rather than under the car, so I can't compare.

My wife says I stink every time i come back from a ride. She just don't like my new purfume.LOL
Jeffm2007-10-07 06:45:43


catalytic converter

Posted: 10/7/07 6:48am Message 14 of 18
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Lanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 828
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
on my 75 which doesn't have them the exhaust used to smell a lot. believe it or not i switched from using a cheap premium gas to a name brand and that cut it down a lot. still has an odor to it but here in nj they are adding ethanol so that may have an effect. anyway the exhaust is behind me so it doesn't bother meRolling%20On%20The%20Floor%20Laughing. seriously i think the smell comes mostly from the additive.

getting back to the 90, i went out and got the old converter out and the pipe was a little out of round plus the old weld was there was going to drop the y  but couldn't get one nut undone and it was getting late so i stopped.

went inside and showered and started thinking about the way my luck is and figured if i just replace the cat, the precats would be clogged and if i just replaced the front half the back half would start falling apart so i am replacing the whole system.

i am getting the y pipe without the precats and it comes with a high flow converter and from another place getting the rear y pipe with low backpressure mufflers.

this way i know the whole system will be new and i won't be doing any work twice. will let you know how it turns out when the parts come in.Thumbs%20Up



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catalytic converter

Posted: 10/7/07 6:53am Message 15 of 18
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Lanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 828
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
[/QUOTE]

My wife says I stink every time i come back from a ride. She just don't like my new purfume.LOL
[/QUOTE]

my wife complains about my exhaust stinking too. only thing is i don't think she is talking about the exhaust from the carRolling%20On%20The%20Floor%20LaughingRolling%20On%20The%20Floor%20LaughingRolling%20On%20The%20Floor%20Laughing.
eddie208752007-10-07 06:54:30


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catalytic converter

Posted: 10/7/07 6:56am Message 16 of 18
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Greensburg, IN - USA
Joined: 9/24/2003
Posts: 5188
Vette(s): Previous: 1984 Silver / Charcoal Coupe, 1988 Maroon Coupe / 1989 Artic White Coupe / 2001 Speedway White Roadster / Present:1976 Stingray Black / Black, Auto, 350 slightly modified (355 hp) Luxor Wires Redline Tires. / 1989 Roadster Bright Red...
The Blacray definately has an odiferous quality comming from the tailpipes that can be taken as "That Thar Sitnkz!" Kinda a mix tween fuelz that formz somefin new maybe Eggsoline?

No matter he runs purty good an ah haint gonna mess with him as long as he haint broke.



catalytic converter

Posted: 10/7/07 3:45pm Message 17 of 18
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baton rouge, LA - USA
Joined: 8/12/2006
Posts: 391
Vette(s): 1981 dark metallic blue, dark doeskin leather interior, mirrored glass T Tops, 330hp/350ci GMPP crate engine, billeted aluminum serpentine system, Dewitts with dual spalls
I hear you all and thanks!  I have an old 67 vehicle with no cats and I never smell like exhaust.
 
I also run name brand premium and they haven't added ethanol down here yet, so go figure!



catalytic converter

Posted: 10/8/07 7:51am Message 18 of 18
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Joined: 3/19/2005
Posts: 385
I had mine removed and straight pipes run to my Monza performance mufflers, it feels like my 77 has 50 more horses pulling her and she sounds really great. Gene gs77vet2007-10-08 07:53:34


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