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07-24-2013, 06:05 PM
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#1 |
 Drives: 2006 Crownline Join Date: May 2012
Location: .
Posts: 700
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Just another FYI. Converters on SC cars = waste of money
I have the SLP Long Tubes and hi-flow cats. I drive very conservatively. I decided to do a 'health check' on the Cats and this is what I found on both of them:
Maybe 1,000 miles on them and they are already starting to collapse...or whatever it's called. Anyway. Gutted now. But just wanted to say that with FI cars, after market Cats are junk and I feel that manufacturers are misrepresenting what these Cats will stand up to. If your car is FI, no cats! It's only a matter of time before your converter goes on a forced induction car. So get rid of it now, or if your buying long tubes, do NOT waste money on after market converters. |
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07-24-2013, 06:08 PM
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#2 |
   
Drives: Fire Engine Join Date: Oct 2008
Location: WPB, Florida
Posts: 1,415
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this has been discussed ad nauseum. I think the consensus is it all comes down to the tune. I've had cats with Ted's tune for over a year and my cats look spotless. Glad you caught it.
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12.618 @ 110.75 Bone Stock 1/4 mile
8.165 @ 86.52 Bone Stock 1/8 mile 11.189 @ 124.44 on a 1.73 60' TVS2300 3.4 pulley, JRE tuned, Kooks LT headers and HF cats, MBRP catback exhaust, CAI intake, ADM scoop. Stock wheels/tires. Sold |
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07-24-2013, 06:11 PM
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#3 | |
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Drives: 2006 Crownline Join Date: May 2012
Location: .
Posts: 700
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Quote:
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07-24-2013, 07:15 PM
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#4 |
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5.0 lol...
Drives: 2010 Camaro 2SS M6 Join Date: Aug 2012
Location: Killeen, Texas
Posts: 140
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I wouldn't run cats with boost, just on principle. Less restriction there is, better.
Of course I didn't have cats when I was NA so I'm slightly biased lol. If your county has no emissions testing, no point wasting money on high flow cats 
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2010 2SS M6 SWG built turbo car
2000 Z28 A4 Custom tuned by a Skinny White Guy |
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07-24-2013, 07:30 PM
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#5 |
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PHAT B33
Drives: 2012 TF3 Camaro 2SS/RS M6 Join Date: Jun 2012
Location: Dark of the Moon
Posts: 1,460
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OP - Is your tune stock and if not what afr are you running at WOT?
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Another 1 of 371 '12 T3 LS3 M6's built.
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07-24-2013, 09:04 PM
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#6 | |
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Drives: 2006 Crownline Join Date: May 2012
Location: .
Posts: 700
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Quote:
Since then I added SLP headers/cats, 3.4 pulley, boost-a-pump. Right after the install, the car was tuned by Steve Williams 'Tuned by Frost' @ Performance Autosport. The car actually runs a little rich. Sorry, don't have AFR numbers on hand. I rarely ever drive the car and do not drive it hard at all. 3800 miles on it. Bought it May 2012 with 6 miles on the Odometer. When I have occasionally gotten 'into it' it runs up very smooth and pulls strong. Very happy with the way it runs. The spark plugs all look good. |
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07-24-2013, 09:22 PM
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#7 |
Drives: 2011 Inferno Orange SS Convertible Join Date: Apr 2012
Location: Tyrone, PA
Posts: 640
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From other forums it seems if you need to run cats with boost or nitrous you should use stock style "porcelain" cats. Especially with spray, don't overdo it with cats or you could melt exhaust valves.
I go catless with power adders.
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2011 SS IOM Vert. ECS Vortech 13+ psi, Water/Meth, ID850’s, ZL1 pump with MSD Voltage Booster, 2800 stall, LT headers, Drag radials, Drag alignment, Cradle Bushings. A million other supporting mods. Tuned by Ted.
Last edited by dan0617; 07-24-2013 at 10:18 PM. |
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07-24-2013, 09:36 PM
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#8 | |
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5.0 lol...
Drives: 2010 Camaro 2SS M6 Join Date: Aug 2012
Location: Killeen, Texas
Posts: 140
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Quote:
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2010 2SS M6 SWG built turbo car
2000 Z28 A4 Custom tuned by a Skinny White Guy |
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07-25-2013, 08:53 AM
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#9 |
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Account Suspended
Drives: 2012 Camaro RS, RX supercharged Join Date: Dec 2009
Location: Bradenton, FL
Posts: 6,063
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From WOT if the tune is not correct it can dump unburnt fuel into the cats causing the damage as they are red hot so the shock of the cooling so quick can destroy them in an instant.
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07-25-2013, 12:57 PM
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#10 | |
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Drives: 2006 Crownline Join Date: May 2012
Location: .
Posts: 700
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Quote:
On a related note. Gutting those suckers was a real PAIN in the neck. I had to drill and drill. For something starting to fall apart, they did not want to come out at all. I was pleased that the sound did not change much at all. Just a little bit, but nothing what I was expected. |
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07-26-2013, 01:11 PM
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#11 | |
 Drives: 2xCorvette Join Date: Jul 2013
Location: Finland
Posts: 11
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I always thought that the Cat Overtemp Protection which is in the PCM in stock form does exactly that, i.e. richens the AFR to protect the cats. But maybe too much is then too much? On the other hand, having low WOT spark advance increases EGT temps rapidly. And having lower than stock advance is very typical with supercharger kits. I would guess the (higher WOT) spark advance is the main reason why cats last forever in ZL1 or in ZR1. |
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07-26-2013, 01:40 PM
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#12 | |
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Drives: 2011 Inferno Orange SS Convertible Join Date: Apr 2012
Location: Tyrone, PA
Posts: 640
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Quote:
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2011 SS IOM Vert. ECS Vortech 13+ psi, Water/Meth, ID850’s, ZL1 pump with MSD Voltage Booster, 2800 stall, LT headers, Drag radials, Drag alignment, Cradle Bushings. A million other supporting mods. Tuned by Ted.
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07-26-2013, 01:55 PM
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#13 | |
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Drives: 2xCorvette Join Date: Jul 2013
Location: Finland
Posts: 11
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Or if I misunderstood; aftermarket cats are more vulnerable than stock ones? Although those do melt as well sometimes. |
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07-26-2013, 02:17 PM
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#14 |
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instigator
Drives: 2020 6.2 Trail Boss, 2022 XC90 Join Date: Jan 2010
Location: 72034
Posts: 3,979
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correct...stock ones are more durable.
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-John S.
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