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Old 10-24-2001, 11:22 AM   #1
nicd
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Exclamation Pre-turbo cat failure = blown turbo

Did we have any one else with this problem which seems to be due to faulty welds in the pre-turbo cat. I have heard of one similar experience in Australia at least of reported incident. But At this point I was wondering if we should be concerned?
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Old 10-24-2001, 11:23 AM   #2
nhluhr
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time for that catless uppipe from Shiv, Ultimate, vividracing, or somebody else!
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Old 10-24-2001, 11:57 AM   #3
Jaxx
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as i recall... the other incident was due to high boost levels using a mbc-->which lead to high EGT--> which melted the cat-->cat pieces flew in to turbo---->turbo go boom
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Old 10-24-2001, 12:31 PM   #4
WRXThis
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My precat turbo went bad and fried my turbo, head, and valve shims. Hmm...faulty welds, that would explain it.

Needless to say my precat is being replaced with a Brullen up pipe as soon as it arrives.

Last edited by WRXThis; 10-24-2001 at 02:20 PM.
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Old 10-24-2001, 12:46 PM   #5
gtguy
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Put this one with the "broken transmissions" stuff. If there were that kind of stuff going on, we would sure as heck have heard about it, given that we hear about every little paint chip that someone gets. It can be used as justification for a new up-pipe however, if that's what you're thinking about.

Kevin
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Old 10-24-2001, 01:08 PM   #6
nicd
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Exclamation One here in MTL

Not to start a frenzy but I just talked to a dealer in Montreal that has confirmed an incident like this just this week.
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Old 10-24-2001, 01:13 PM   #7
djerickd
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Leonardo had a faulty precat also,

Dealer fix: Shiv up-pipe

SWEET!
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Old 10-24-2001, 01:32 PM   #8
HndaTch627
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I am curious how a pre turbo cat would take out a cylinder head, a valve and and valve shims??

Elighten me

Last edited by HndaTch627; 10-24-2001 at 03:42 PM.
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Old 10-24-2001, 01:51 PM   #9
Kevin
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I'm just curious as to where this 'precat turbo' is, I can only find one turbo on my car.
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Old 10-24-2001, 02:49 PM   #10
nicd
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Pre-turbo cat would that be correct?
Pre-turbo
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Old 10-24-2001, 03:14 PM   #11
Conduit
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We will see more of these. Running an just a BC will make your car run nice and rich...which clogs the cat, and will eventually make it break up. Please don't drive much with a BC and no uppipe, or you will feel it too! I'm already worrying about my expensive 3" high-flow cat.
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Old 10-24-2001, 03:18 PM   #12
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Quote:
Originally posted by Conduit
We will see more of these. Running an just a BC will make your car run nice and rich...which clogs the cat, and will eventually make it break up. Please don't drive much with a BC and no uppipe, or you will feel it too! I'm already worrying about my expensive 3" high-flow cat.
rich? I thought the bc would lean things out. Are you saying the MAF will compensate (to a point) by ading fuel?

-C
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Old 10-24-2001, 04:04 PM   #13
Conduit
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The ECU essentially dumps fuel when it sees that boost pressure is exceeding factory parameters. It goes open-loop and runs very very rich. Sometimes as bad as 9.8:1, hence the poor gas mileage, etc. This is why a/f and timing really should be controlled if you are going to use a BC.
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Old 10-24-2001, 04:18 PM   #14
HndaTch627
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and also once your pass the 12.0:1 A/F ratio you make LESS power then you did in the beginning, not ot mention the fact that the ecu is going to continue to pull timing away until the point that it can regulate the boost again.

jeremy
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