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07-24-2011, 01:58 PM
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#1 |
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3" Exhaust
Join Date: Apr 2011
Location: columbus
Posts: 151
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cat converter causing lower boost?
So...I was driving my 1990 toyota supra turbo, and my friend who was driving behind me said that he could smell rotten eggs. So I'm guessing the cat is bad. Also, I'm only boosting around...5lbs..could a bad cat effect the boost this much? Stockk boost is supposivly around 6.7-6.8ish
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07-24-2011, 03:09 PM
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#2 |
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Supra Forum Moderator
Join Date: Nov 2009
Location: Green-Ohio
Posts: 1,297
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well yes. the material in the catalytic converter may have melted over in places causing a severe restriction to exhaust flow and preventing boost from developing.
I would check for any vac leaks first, its ez enough. When your boosting do you see you needle dropping even with pressure on the throttle? thats one ez way to check for a major vac leak.
__________________
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07-24-2011, 03:21 PM
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#3 |
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3" Exhaust
Join Date: Apr 2011
Location: columbus
Posts: 151
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No the needle never drops when on the throttle. So I don't think its a vac leak
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07-24-2011, 06:38 PM
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#4 |
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12psi boost
Join Date: Feb 2007
Location: Georgia
Posts: 359
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A bad cat can definately cause problems. If it has to be replaced I'd recommend a hi-flow cat. Magnaflow has a good one that I'm running.
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07-24-2011, 06:54 PM
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#5 |
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3" Exhaust
Join Date: Apr 2011
Location: columbus
Posts: 151
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Yea I plan on just buying a test pipe because I'm getting a new exhaust here soon. 3" pipe, the whole shabang. And I live in ohio and the emmission rules are lax
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07-24-2011, 08:47 PM
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#6 |
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Stock
Join Date: Jul 2011
Location: Brampton, ON, Canada
Posts: 2
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I took off my Cat from my supra mk3 7m-ge. i really felt the difference when i took it off compare when i actually had it
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