Coating a cat
Thread Starter
Le Mans Master
Joined: Mar 2002
Posts: 5,253
Likes: 50
From: Sandy Eggo Calif.
St. Jude Donor '06-'07-'08-'09-'10-'11-'12, '16
Coating a cat
I have these Random Tech. bolt in high flow cat's. I didn't get them for the HP (6-8?) I was going to Jet-hot coat 'em, and wanted the cooler under hood/interior temps, the added flow, and maybe some more sound.
Anyway, when I got 'em, I read the paperwork and it said that painting, plating, or coating them, would void the warranty,(I don't care) and could cause them to fail, by over heating. (aren't they suppose to get hot?)
I contacted Jet-Hot who said that it's B.S. and has never had any problems. I contacted three other coating companies which only one said not to coat.
I then remembered Jim Hall's post saying that there was a cat overtemp protection circuit that adds 20% more fuel when activated.(That would hurt my gas mileage.)
So my question to the Guru's is if I coat them, can they get too hot? If so, will it cause the overtemp circuit to add more gas? Anyone have any experience with this? Thanks.
Anyway, when I got 'em, I read the paperwork and it said that painting, plating, or coating them, would void the warranty,(I don't care) and could cause them to fail, by over heating. (aren't they suppose to get hot?)
I contacted Jet-Hot who said that it's B.S. and has never had any problems. I contacted three other coating companies which only one said not to coat.
I then remembered Jim Hall's post saying that there was a cat overtemp protection circuit that adds 20% more fuel when activated.(That would hurt my gas mileage.)
So my question to the Guru's is if I coat them, can they get too hot? If so, will it cause the overtemp circuit to add more gas? Anyone have any experience with this? Thanks.
Drifting
Joined: Feb 2000
Posts: 1,591
Likes: 53
From: Central MN
Originally Posted by WS6JJP
im sorry i dont have an answer to your question but i was wondering how much of a sound difference is there between these high-flow cats and the stock ones? Any deeper of a sound or just slightly louder?
Also, where did you buy them and, if I may ask, how much did you pay for them?
Thread Starter
Le Mans Master
Joined: Mar 2002
Posts: 5,253
Likes: 50
From: Sandy Eggo Calif.
St. Jude Donor '06-'07-'08-'09-'10-'11-'12, '16
I don't have my car yet, so I'm buying things to help me keep from going nucking futs. Here's the LINK Looks like you have to remove the bolts from the top. Can you see the bolts from the top? It says 20 min. install.
Racer
Joined: Feb 2005
Posts: 380
Likes: 33
Originally Posted by TommyV
I don't have my car yet, so I'm buying things to help me keep from going nucking futs.
let us know how they sound once you get your car and install them
Race Director
Joined: Jan 2001
Posts: 11,183
Likes: 85
From: Castle Rock CO
St. Jude Donor '15
With many of the newer vehicles, the cats already flow very well and there is little change in the exhaust tone by going to a high flow cat.
I have always been told you can not coat the cats due to the heat used during the coating process. I have had many sets of headers coated and even some of the pipes that come after them, but never had the cats coated.
Maybe they have a new process to coating the cats. Oh, I have used Jet Hot's ceramachrome on all my exhaust mods, so maybe there is a difference in the coating you choose.
Todd
I have always been told you can not coat the cats due to the heat used during the coating process. I have had many sets of headers coated and even some of the pipes that come after them, but never had the cats coated.
Maybe they have a new process to coating the cats. Oh, I have used Jet Hot's ceramachrome on all my exhaust mods, so maybe there is a difference in the coating you choose.
Todd
Team Owner
Joined: Feb 2000
Posts: 45,428
Likes: 892
From: Texas
CI 1-4-5-8-9-10 Vet
St. Jude Donor '03 thru '10, '17
This is just me, but if the manufacturer said not to coat them, I would not coat them. Not only could the coating process be harmful, but the additional insulation could damage them during operation. They are probably designed to shed a certain abount of heat through convection and you will be blocking that. I doubt that you will reduce cabin heat much, if any by coating them. If you're worried, try adding a heat shield.
I would trust the cat manuf before I would trust someone who you are paying to coat them. Who knows, if you overheat them, you may FUBAR the internals and INCREASE backpressure.
I would trust the cat manuf before I would trust someone who you are paying to coat them. Who knows, if you overheat them, you may FUBAR the internals and INCREASE backpressure.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Race Director
Joined: May 2005
Posts: 13,787
Likes: 0
From: . [Rotorhead] "You seem to be a douche. What I'm getting at is just STFU" [/Rotorhead]
St. Jude Donor '06 & '09 & '11
Originally Posted by SickRick
I like mine EXTRA CRISPY...
Ooops - were we taking about CATALYTIC CONVERTERS?
Rick
Ooops - were we taking about CATALYTIC CONVERTERS?
Rick
My thought exactly. Well, not exactly. My first thought was "with what?" Corn Flake crumbs, Oven Fry, seasoned flour??
Thread Starter
Le Mans Master
Joined: Mar 2002
Posts: 5,253
Likes: 50
From: Sandy Eggo Calif.
St. Jude Donor '06-'07-'08-'09-'10-'11-'12, '16
Originally Posted by need-for-speed
Who knows, if you overheat them, you may FUBAR the internals and INCREASE backpressure.