Off Road Y-pipe for stock manifolds
01-20-2005, 03:11 PM
#1
Off Road Y-pipe for stock manifolds i have a 98 Z with an A4, and i was wanting to know what would be the best way to take my cats off, should i gut them, or is there an off road y-pipe for my stock manifolds. thanks for any help!! 
Charlie
Charlie
01-20-2005, 03:13 PM
#2
Originally Posted by BES Stroked Nova
i have a 98 Z with an A4, and i was wanting to know what would be the best way to take my cats off, should i gut them, or is there an off road y-pipe for my stock manifolds. thanks for any help!!
Charlie
Charlie
01-20-2005, 06:12 PM
#3
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Originally Posted by skewba98z28
Just make sure to get 02 sims for the rear sensor's or get a tune to eliminate them. Because your car won't run right if you don't.
01-20-2005, 06:49 PM
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Originally Posted by RPM WS6
The sims or code deletes are only to remove the SES light. The car will run just fine even without sims or having the codes deleted.....
01-20-2005, 06:54 PM
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Originally Posted by wbw2
I disagree, with my MAC ory and no O2 simms my car ran OK, but it sucked down gas like a beast!
01-20-2005, 09:07 PM
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I wouldn't waste my money on an off-road y-pipe for stock manifolds, I'd just gut the stock cats and be done with it. If you're going to spend money on it get some headers 
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03-04-2005, 10:49 PM
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Does the MAC ory bolt to the stock manifolds and slip on to the back of the exhaust? I think I may have a bad cat and my warranty is up..........figure I'd take the cheap way out.
03-05-2005, 12:05 AM
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The car can get into catalyst protection enrichment
(COT) mode with little provocation. I think this is one
reason people complain about rich operation, and it's a
problem. The PCM has certain calculations about the
catalyst load and engine exhaust and catalyst temp
and will dump fuel to quench. It will do this when the
cat is not there, just because. Now, the places where
you would be likely to burn a cat are about -exactly-
where you'd make some nice horsepower. If you were
to do a quick series of highway acceleration runups, you
would probably see a sudden and heavy enrichment on
the second or third that takes a while to go away, maybe
the car just seems to lose power until tomorrow and it's
all better.
If your cats are gone and you like to have sustained high
power output you want this (COT) turned off. If you have
headers with remote cats the temps are probably too cool
to need it either. It's for the close-in, hot-running (but you
will at least pass your rectal smog exam) pup-cats to live.
See this with a scanner as commanded fuel air multiplier of
1.25 while your PE/OLFA table settngs are probably more
like 1.15 (if you're not having to fake around some other
mixture error). But stock PE is also the excessive 1.25 on
F-bodies at least. But if you set that low and still see some
intermittent fatness, this is your next place to look. A good
thing to get turned off whilst killing codes. But if you do have
the close in cats you will probably kill them and that would
be bad.
(COT) mode with little provocation. I think this is one
reason people complain about rich operation, and it's a
problem. The PCM has certain calculations about the
catalyst load and engine exhaust and catalyst temp
and will dump fuel to quench. It will do this when the
cat is not there, just because. Now, the places where
you would be likely to burn a cat are about -exactly-
where you'd make some nice horsepower. If you were
to do a quick series of highway acceleration runups, you
would probably see a sudden and heavy enrichment on
the second or third that takes a while to go away, maybe
the car just seems to lose power until tomorrow and it's
all better.
If your cats are gone and you like to have sustained high
power output you want this (COT) turned off. If you have
headers with remote cats the temps are probably too cool
to need it either. It's for the close-in, hot-running (but you
will at least pass your rectal smog exam) pup-cats to live.
See this with a scanner as commanded fuel air multiplier of
1.25 while your PE/OLFA table settngs are probably more
like 1.15 (if you're not having to fake around some other
mixture error). But stock PE is also the excessive 1.25 on
F-bodies at least. But if you set that low and still see some
intermittent fatness, this is your next place to look. A good
thing to get turned off whilst killing codes. But if you do have
the close in cats you will probably kill them and that would
be bad.
