High flow cat placement and efficiency
Thread Starter
Heel & Toe
Joined: Jan 2004
Posts: 17
Likes: 0
From: Joshua TX
High flow cat placement and efficiency
I recently got LG longtube headers with metal matrix cats. The car runs great. I would never go back to stock. However there is one small problem. The car definately smells of unburned hydrocarbons now.
I was under the car today looking at all the slip joints. It looks like all the large and small ends are in the right order to just move the cats up in front of the Xpipe. The clearance looks tight, and it might require turng a clamp or two around so the bolts don't touch. But I think it will work.
I've been told the cats will work at temperatures as low 140 degrees.
So here is the questions. Has anyone done this? Will moving the cats 2 feet closer to the motor increase their temp and eliminate the smell? I Just don't want to waste the time if it won't make a difference. Thanks in advance.
I was under the car today looking at all the slip joints. It looks like all the large and small ends are in the right order to just move the cats up in front of the Xpipe. The clearance looks tight, and it might require turng a clamp or two around so the bolts don't touch. But I think it will work.
I've been told the cats will work at temperatures as low 140 degrees.
So here is the questions. Has anyone done this? Will moving the cats 2 feet closer to the motor increase their temp and eliminate the smell? I Just don't want to waste the time if it won't make a difference. Thanks in advance.
Melting Slicks
Joined: Feb 2003
Posts: 2,814
Likes: 1
From: FT Lewis WA
Re: High flow cat placement and efficiency (High Vettelocity)
I recently got LG longtube headers with metal matrix cats. The car runs great. I would never go back to stock. However there is one small problem. The car definately smells of unburned hydrocarbons now.
I was under the car today looking at all the slip joints. It looks like all the large and small ends are in the right order to just move the cats up in front of the Xpipe. The clearance looks tight, and it might require turng a clamp or two around so the bolts don't touch. But I think it will work.
I've been told the cats will work at temperatures as low 140 degrees.
So here is the questions. Has anyone done this? Will moving the cats 2 feet closer to the motor increase their temp and eliminate the smell? I Just don't want to waste the time if it won't make a difference. Thanks in advance.
I was under the car today looking at all the slip joints. It looks like all the large and small ends are in the right order to just move the cats up in front of the Xpipe. The clearance looks tight, and it might require turng a clamp or two around so the bolts don't touch. But I think it will work.
I've been told the cats will work at temperatures as low 140 degrees.
So here is the questions. Has anyone done this? Will moving the cats 2 feet closer to the motor increase their temp and eliminate the smell? I Just don't want to waste the time if it won't make a difference. Thanks in advance.
[Modified by Cary, 10:38 PM 2/2/2004]
Safety Car
Joined: Oct 2000
Posts: 4,949
Likes: 10
From: Monticello MN
Re: High flow cat placement and efficiency (Cary)
I was under the car today looking at all the slip joints. It looks like all the large and small ends are in the right order to just move the cats up in front of the Xpipe. The clearance looks tight, and it might require turng a clamp or two around so the bolts don't touch. But I think it will work.
I've been told the cats will work at temperatures as low 140 degrees.
So here is the questions. Has anyone done this? Will moving the cats 2 feet closer to the motor increase their temp and eliminate the smell? I Just don't want to waste the time if it won't make a difference. Thanks in advance.
I've been told the cats will work at temperatures as low 140 degrees.
So here is the questions. Has anyone done this? Will moving the cats 2 feet closer to the motor increase their temp and eliminate the smell? I Just don't want to waste the time if it won't make a difference. Thanks in advance.
Ed
[Modified by C5XTASY, 11:13 AM 2/3/2004]
Melting Slicks
Joined: Dec 2001
Posts: 2,040
Likes: 0
From: Collin County Texas
Re: High flow cat placement and efficiency (High Vettelocity)
From NAPA, you can buy some nice looking clamps that surround the entire pipe at the joint and will seal good . A little high dollar but they work.
They are about 4-5 inches long, wrap around the joint, extending past the joint on either end of it 1-2 inches. They have a very nice looking clamping action provided by two husky looking bolts.
At one of the local shops (maybe Lou's or MMT), I saw some of these.
They are about 4-5 inches long, wrap around the joint, extending past the joint on either end of it 1-2 inches. They have a very nice looking clamping action provided by two husky looking bolts.
At one of the local shops (maybe Lou's or MMT), I saw some of these.
Race Director
Joined: Aug 2002
Posts: 16,689
Likes: 1
From: Redacted
Re: High flow cat placement and efficiency (High Vettelocity)
Will moving the cats 2 feet closer to the motor increase their temp and eliminate the smell? I Just don't want to waste the time if it won't make a difference. Thanks in advance.
The other thing to keep in mind is the car probably needs a careful dyno tuning since you have really changed it's flow dynamics with the headers and high-flows. If the engine is running rich, it may be dumping more fuel on the cats than they can handle, which will cause them to overheat and fail in addition to making funky odors.
