Time to melt some cats. - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Iam Broke · 08-28-2014, 06:16 PM

Put the Kook's HFC's on today in prep for the bi-annual emission test. Never got a reply if anyone melted a set of Kook's non green cats boosted so we'll see if the corn will pop 'em at 10 psi.

I know many other cats have been kooked. Pun intended.

Welded another bung in front of the substrate to monitor temps pre-cat to compare what I had catless. Maxed out at 1350*f after a 3-4 speed run to 150 (on closed roads of course) when catless. Hoping for good weather and time off over the weekend.

At idle catless I had 200*f and catted I see 400*f radiating back inside them. Probe tip is ~3/8 inch in front of the substrate.

I wonder what temp will melt the substrate on these.

When they pop I'll gut them. I have a small usb camera on a wand so I can pull the temp sensor and take a peek inside as well. It takes less than an hour to do the swap so it's not a big deal.

franknbeans · 08-28-2014, 07:17 PM

my issue of going catless is the stink. Man it is bad.

Had my buddy that it catless in front of me a month ago and i was choking on the fumes.

Need4speed_motorsports · 08-28-2014, 07:22 PM

I run catless on one of my cars.

In California its a big no no, but then again I never listened to California laws haha.

Iam Broke · 08-28-2014, 07:37 PM

It doesn't stink bad catless on E85 but I have to pass a visual & OBDII every two years.

ClosequarterHSV · 08-28-2014, 10:55 PM

Mine had no smell and mine was catless. At least no one told me. Always ran 93 octane

LSX Camaro · 08-29-2014, 12:29 AM

wow I could say a lot...

Batmanntexas · 08-29-2014, 05:47 PM

Quote:

Originally Posted by Iam Broke

It doesn't stink bad catless on E85 but I have to pass a visual & OBDII every two years.

Got a question for you on the whole OBDII thing.
What exactly are they looking for? If the codes for the rear O2 sensors are turned off in the ECM, will that fail the OBDII check?

Iam Broke · 08-30-2014, 11:16 AM

Got to wind out 3rd today and compare it to a catless log. No change in boost or MAF freq max, 60-100mph times the same so no performance loss to speak of. 80* ambient 70% humidity and had a 3.9 sec 60-100 on the same level ground logged in HPTuners from a 50 roll in third.

Max EGT catless was 1200 at the top of third, today I saw 1360*f pre cat.

Time will tell.

ihada69L78 · 08-30-2014, 11:30 AM

I read on here (so I know it's true) that melted cats are caused by a tune that is too rich. ??

Iam Broke · 08-30-2014, 02:11 PM

Doubtful since cat overtemp protection in a tune richens it up.

I would think too lean and too high EGT's would melt them. Most I've seen cooked were melted over on the inlet side.

Destructo09 · 08-30-2014, 02:27 PM

Quote:

Originally Posted by Iam Broke

Doubtful since cat overtemp protection in a tune richens it up.

I would think too lean and too high EGT's would melt them. Most I've seen cooked were melted over on the inlet side.

Too rich can melt them in a hurry. They're made to burn up the left over fuels and convert them.

I had a old '83 GMC once with longtubes and some generic universal cats and the floats on the carb got stuck once so bad it was blowing black smoke out of the pipes at idle. It never really ran real well after that and turned out the cat was nice and melty.

I suppose the opposite extreme is possible too though.

Andy-AMSOIL · 08-30-2014, 08:54 PM

Who needs cats anyways... Real me don't like cats as an animal nor as in their car ...lol

08-28-2014, 06:16 PM	#1
Iam Broke PHAT B33 Drives: 2012 TF3 Camaro 2SS/RS M6 Join Date: Jun 2012 Location: Dark of the Moon Posts: 1,460 View My Garage	Time to melt some cats. Put the Kook's HFC's on today in prep for the bi-annual emission test. Never got a reply if anyone melted a set of Kook's non green cats boosted so we'll see if the corn will pop 'em at 10 psi. I know many other cats have been kooked. Pun intended. Welded another bung in front of the substrate to monitor temps pre-cat to compare what I had catless. Maxed out at 1350f after a 3-4 speed run to 150 (on closed roads of course) when catless. Hoping for good weather and time off over the weekend. At idle catless I had 200f and catted I see 400f radiating back inside them. Probe tip is ~3/8 inch in front of the substrate. I wonder what temp will melt the substrate on these. When they pop I'll gut them. I have a small usb camera on a wand so I can pull the temp sensor and take a peek inside as well. It takes less than an hour to do the swap so it's not a big deal. __________________ Another 1 of 371 '12 T3 LS3 M6's built. Last edited by Iam Broke; 08-28-2014 at 06:54 PM.*

08-28-2014, 07:17 PM	#2
franknbeans Whipped Drives: 2010 CAMARO Join Date: Sep 2008 Location: Pittsburgh-ish - PA Posts: 4,216 View My Garage	my issue of going catless is the stink. Man it is bad. Had my buddy that it catless in front of me a month ago and i was choking on the fumes. __________________ Car of the week 7/7/14

08-28-2014, 07:37 PM	#4
Iam Broke PHAT B33 Drives: 2012 TF3 Camaro 2SS/RS M6 Join Date: Jun 2012 Location: Dark of the Moon Posts: 1,460 View My Garage	It doesn't stink bad catless on E85 but I have to pass a visual & OBDII every two years. __________________ Another 1 of 371 '12 T3 LS3 M6's built.

08-29-2014, 12:29 AM	#6
LSX Camaro Master ASE, GM, LSX Tech. Drives: 2010 Camaro SS Join Date: Oct 2012 Location: Austin, TX Posts: 1,034	wow I could say a lot... __________________ 2010 2SSRS A6, Custom Pat G. Cam, WCCH Cylinder Heads, Kooks Headers/Exhaust, BTR Valvetrain, Fluidampr 25% UDP, All Engine ARP bolts, Flex-a-lite radiator/Trans cooler, Yank converter, PFADT Suspension, ADM Race Intake/Scoop, Torq tow hook, CFD auto shifter, Dynojet AFR gauge, Aeroforce scan gauge, Brake Performance rotors/pads Prothane bushings, ZL1 wheels, spoiler, Z/28 wickerbill, 1LE Aero/Suspension Package, Anderson Composites COPO Carbon Fiber Hood, LED lighting, Elite Catch Can, Improved Racing oil pan baffle, crank scraper, windage tray 480 RWHP 452 RWTQ + Nitrous Express 150 Shot

08-30-2014, 11:16 AM	#8
Iam Broke PHAT B33 Drives: 2012 TF3 Camaro 2SS/RS M6 Join Date: Jun 2012 Location: Dark of the Moon Posts: 1,460 View My Garage	Got to wind out 3rd today and compare it to a catless log. No change in boost or MAF freq max, 60-100mph times the same so no performance loss to speak of. 80* ambient 70% humidity and had a 3.9 sec 60-100 on the same level ground logged in HPTuners from a 50 roll in third. Max EGT catless was 1200 at the top of third, today I saw 1360*f pre cat. Time will tell. __________________ Another 1 of 371 '12 T3 LS3 M6's built.

08-28-2014, 07:22 PM	#3
Need4speed_motorsports Drives: 2016 Camaro SS Join Date: Apr 2014 Location: Glendale, CA Posts: 4,656 View My Garage	I run catless on one of my cars. In California its a big no no, but then again I never listened to California laws haha.

08-28-2014, 10:55 PM	#5
ClosequarterHSV Drives: Magna Charged 2011 SS/RS M6 Join Date: Aug 2014 Location: Huntsville Al Posts: 68 View My Garage	Mine had no smell and mine was catless. At least no one told me. Always ran 93 octane

08-30-2014, 11:30 AM	#9
ihada69L78 Drives: 2023 Silverado LTZ, 2022 Camaro 2SS Join Date: Jul 2010 Location: Arkansas Posts: 322	I read on here (so I know it's true) that melted cats are caused by a tune that is too rich. ?? __________________ Currenent rides: 2020 SW ZL1 A10 2019 SW 2SS A10 2017 SW Silverado LTZ

08-30-2014, 02:11 PM	#10
Iam Broke PHAT B33 Drives: 2012 TF3 Camaro 2SS/RS M6 Join Date: Jun 2012 Location: Dark of the Moon Posts: 1,460 View My Garage	Doubtful since cat overtemp protection in a tune richens it up. I would think too lean and too high EGT's would melt them. Most I've seen cooked were melted over on the inlet side. __________________ Another 1 of 371 '12 T3 LS3 M6's built.

08-30-2014, 08:54 PM	#12
Andy-AMSOIL Drives: bicycle Join Date: Jun 2014 Location: Digging for oil Posts: 375	Who needs cats anyways... Real me don't like cats as an animal nor as in their car ...lol