clogged pre-cat?
12-10-2005, 09:42 PM
#1
Racer
Thread Starter
Member Since: Mar 2004
Location: Houston Texas
Posts: 305
Likes: 0
Received 0 Likes
on
0 Posts
clogged pre-cat?
Please excuse my ignorance, but what is a clogged pre-cat?
I was reading some of the past threads, and came across this.
The thread was about a C4 running rough, and one of our members suggested that a clogged pre-cat might be the problem.
I was reading some of the past threads, and came across this.
The thread was about a C4 running rough, and one of our members suggested that a clogged pre-cat might be the problem.
12-11-2005, 04:20 PM
#3
Race Director
Her's a pic from an 86. They are the fat metal objects on the front Y pipes.
Here is a pic of a catless front Y pipe before I installed it on my 87.
Here is a pic of a catless front Y pipe before I installed it on my 87.
what they said
12-12-2005, 01:02 AM
#5
Advanced
Member Since: Jan 2004
Location: CO
Posts: 89
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by corvetteronw
Her's a pic from an 86. They are the fat metal objects on the front Y pipes.
Here is a pic of a catless front Y pipe before I installed it on my 87.
Here is a pic of a catless front Y pipe before I installed it on my 87.
12-12-2005, 06:14 AM
#6
Team Owner
Member Since: Oct 2000
Location: 63.8% of all statistics are made up on the spot.
Posts: 44,755
Likes: 0
Received 1 Like
on
1 Post
St. Jude Donor '08-'10
Originally Posted by Socky
Would putting out the catless Y pipes have a chane in your emissions causing a failure in an E- test?
I did this to my 90 and the answer is no it won't, IF you install a high performance main cat. I got mine from Corvette Central and my car passes emissions every year. One other thing is that this setup flows better than stock and it seems to have added a few more horses. I have no dyno numbers to prove it just a seat of the pants feeling.
12-12-2005, 12:28 PM
#7
Team Owner
Member Since: Sep 2001
Location: Athens AL
Posts: 59,642
Received 1,400 Likes
on
1,016 Posts
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Originally Posted by Socky
Would putting out the catless Y pipes have a chane in your emissions causing a failure in an E- test?
precats really dont do much of the work
12-13-2005, 07:39 PM
#9
Race Director
Originally Posted by vader86
In any state but California you should be fine, but I would put a new main cat on with it to be sure.
precats really dont do much of the work
precats really dont do much of the work
(My question included using hi-performance cats in place of the stock system).
I asked if he was just saying this because he wasn't interested. He replied he wasn't, and that he strongly suggested leaving the stock systems alone. He explained this was happening in conjunction with newer emission standards that required better emissions from larger metropolitan areas in the U.S.
Our metropolitan paper seemed to confirm this last summer.
12-15-2005, 12:36 PM
#10
Racer
Thread Starter
Member Since: Mar 2004
Location: Houston Texas
Posts: 305
Likes: 0
Received 0 Likes
on
0 Posts
thread hi-jacking
Originally Posted by Socky
Thanks for the info. Sorry Slyder I didn't mean to hi-jack your thread.
We both got our questions answered.
12-16-2005, 12:57 PM
#11
Le Mans Master
The shop might be worried that someone would go here:
http://www.epa.gov/compliance/compla..._criminal.html
http://www.epa.gov/compliance/compla..._criminal.html
12-16-2005, 03:48 PM
#12
Team Owner
Member Since: May 2001
Location: ...tearing up the highways, one state at a time™®©
Posts: 31,599
Received 2,102 Likes
on
1,075 Posts
Originally Posted by Socky
Would putting out the catless Y pipes have a chane in your emissions causing a failure in an E- test?
visual, yes - snifer, usually - No.
