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Old 06-22-2007, 05:37 PM   #1
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Default Catalytic Converter has gone bad

Has anyone had their Catalytic Converter go out as a result of adding a greddy turbo?

I have a 1990 Miata with 44,000 miles on it. The base greddy kit has been on my car for about 4000 miles and all of a sudden it seems the Catalytic converter is bad (when you shake the converter it sounds like sand, when I rev the engine it rattles) I thought it was a heat shield on the exhaust at first but it appears to be the converter.
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Old 06-22-2007, 05:44 PM   #2
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too rich.....
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Old 06-22-2007, 05:54 PM   #3
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Your car is almost 20 years old dude. Stuff breaks.
You didn't want a cat on there anyway, did you?
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Old 06-22-2007, 06:07 PM   #4
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Quote:
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Your car is almost 20 years old dude. Stuff breaks.
You didn't want a cat on there anyway, did you?


Exactly they do seem to wear out over time. If it really gets bad it will sound like a vtec crossover at around 4k and bark backfire out of the intake.

Either replace it or break all the honeycomb out with a pickaxe or awl. Wear a respirator mask when you do because there are some nasty metals in a cat.
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Old 06-22-2007, 06:57 PM   #5
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I am not complaining, I just wanted to know if the converter going bad was related to the turbo? The car is in otherwise like new condition.
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Old 06-22-2007, 10:18 PM   #6
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Overly rich condition + more flow could = bad cat
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Old 06-22-2007, 11:45 PM   #7
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Pretty much what the others said. Get an air fuel meter and see if you are running rich or alternatively take it to a shop with a dyno and get a reading off their wideband. Running rich for a while could cause the cat to go bad.

I'm at 192k on my 90 on the stock cat non boosted (haven't hooked up the kit yet). Just passed emissions a few days ago.
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Old 06-23-2007, 01:34 PM   #8
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Quote:
Originally Posted by Harv View Post
Pretty much what the others said. Get an air fuel meter and see if you are running rich or alternatively take it to a shop with a dyno and get a reading off their wideband. Running rich for a while could cause the cat to go bad.

I'm at 192k on my 90 on the stock cat non boosted (haven't hooked up the kit yet). Just passed emissions a few days ago.
Does the car feel sluggish or anything? you might want to get that looked at/changed/or hollowed.
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Old 06-23-2007, 02:15 PM   #9
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Or cut it off and bolt up a replacement from ebay for less than $50 including clamps. Phillip did that for a big truck, i'm sure you could get away with a cheap solution like that for awhile.
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Old 06-23-2007, 02:18 PM   #10
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BEGi had a small score of $50 high flow cats on their website earlier this week.
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Old 06-24-2007, 12:32 AM   #11
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Don't even bother with it if your area doesn't have emissions.

Besides the obvious, another plus to getting rid of it is the pop-pop-pop sound on deceleration like rally cars make
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Old 06-24-2007, 12:59 AM   #12
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gotta love that fuel brunign in the exhaust, +1 it will make flame throwers easier
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Old 06-24-2007, 09:46 AM   #13
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Had to replace my cat a couple of weeks ago. I was going to hollow it out but it had already been replaced once and was welded from the down pipe to the tip. I don't know how long the turbo has been on, I bought the car with it already installed.
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Old 06-24-2007, 10:13 AM   #14
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Thanks for the info
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Old 06-26-2007, 03:30 PM   #15
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Quote:
Originally Posted by Slidin'Miata916 View Post
Does the car feel sluggish or anything? you might want to get that looked at/changed/or hollowed.
Are you talking to me? My car runs fine. Where did I indicate otherwise?
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Old 06-26-2007, 03:59 PM   #16
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Quote:
Originally Posted by Harv View Post
Are you talking to me? My car runs fine. Where did I indicate otherwise?
Would be a symptom of a bad cat?
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Old 06-26-2007, 06:16 PM   #17
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Quote:
Originally Posted by Slidin'Miata916 View Post
Would be a symptom of a bad cat?
What? Are you asking a question? What are you talking about?
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Old 06-26-2007, 06:25 PM   #18
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lol
making a statement.
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Old 06-26-2007, 11:18 PM   #19
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Quote:
Originally Posted by Harv View Post
Are you talking to me?



Last edited by BenR; 06-27-2007 at 12:16 AM.
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Old 06-27-2007, 09:04 AM   #20
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Quote:
Originally Posted by Slidin'Miata916 View Post
Would be a symptom of a bad cat?
Sluggish, won't rev above 4000, if turbo installed no boost.
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