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Old 02-08-2014, 04:22 PM   #1
sycraft
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Supercharger plus Cats = baddddd

Just pulled both of my cats after a dismal feeling performance from my Camaro. Was on the dyno to get some tweaking as some new tables are available, and would fall on its face under load.... Pulled my cats and found both had turned into a brick and was rattling inside . once I get it taken care of I am sure it will be back running strong. It has been a slow process as I noticed my trap speed started to drop first, from 109 down to 104, then under load it felt as if there was a vibration, almost a miss feel to the engine. It was a good time to replace the plugs, so I went with the NGK in a 1 step cooler heat range and tried again. Still fell on its face. So since there were no codes and the engine tested fine, I thought, Cats, those damn cats, Forced induction and cats do not mix... If you got them, keep a close eye on them...
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Old 02-08-2014, 04:55 PM   #2
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what kind of cats/ Modifications/ Tune did you have.
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Old 02-08-2014, 05:01 PM   #3
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Yeah Clint they had this in the FI V8 a while back. Im sure u guys build heat also.
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Old 02-08-2014, 05:06 PM   #4
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Cats and exhaust SOLO, Tuned with hp tuners, AFR was right on. Supercharged. Most all supercharged setups I have seen have had cat issues. This took almost 18k miles to show up of hard driving... Its all good, gonna go without...
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Old 02-08-2014, 05:17 PM   #5
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GLAD you found this before things got worse. Your right...there are several other V6 SC owners here who've had issues with cats and had to dump them.

My question is this...you mentioned your running SOLO exhaust, but was you also using SOLO cats or stock cats?

I've never heard anyone have issues with the stock cats, although I think I'd almost be tempted to remove them too. I guess since the stock cats are more dense and flow less...maybe they hold up better, but you'd think eventually the heat would get to them too.
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Old 02-08-2014, 06:00 PM   #6
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SOLO cats, they really are not meant for SC applications.. Most cats are not. In a NA application they are great. The added heat and fuel in a SC application is hell on all cats, cant fault SOLO...
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Old 02-08-2014, 06:33 PM   #7
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I've been wondering if anyone has tried Kooks Green cats. S'posed to handle 1500 degrees I think... but man are they high priced!

My Solo's also failed after the IPF S/C install, but a lot quicker.
I'm running the stock cats now and so far so good. Really dislike the smell of raw gas you get with no cats, but can feel a decline in low RPM performance with the stock cats in place.
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Old 02-08-2014, 06:41 PM   #8
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I fried my cats on my other car too.
forced injection and cats fight like,cats and dogs
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Old 02-09-2014, 10:40 PM   #9
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I was advised by Ipf to watch out for high flow cats. I ended up hollowing mine out. Car ran great.
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Old 02-10-2014, 09:35 AM   #10
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Has anyone run this by Solo ?? I have a set I removed right when I installed my SC. I wonder the effects on the oem cats ??? Solo was pretty confident in the design when I first purchased. Looks like another item to check as standard maintenance !
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Old 02-10-2014, 09:43 AM   #11
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http://www.camaro5.com/forums/showth...highlight=cats

24 pages worth of info and debate
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Old 02-10-2014, 09:53 AM   #12
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Yep, I have followed the V8 thread, I just haven't seen anyone running the Solo V6 HFC question them on their use with a FI setup. I haven't seen anyone with the oem cats have a problem ?
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Old 02-10-2014, 11:02 AM   #13
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Quote:
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Has anyone run this by Solo ?? I have a set I removed right when I installed my SC. I wonder the effects on the oem cats ??? Solo was pretty confident in the design when I first purchased. Looks like another item to check as standard maintenance !
Yes, I spoke with Steve after mine failed and he expressed surprise and said the Solo's were designed with S/C in mind and that they had many users successfully working with a S/C application.

But it would seem that even with a well tuned LFX, there is a limited amount of exposure they can survive in a S/C'd DI 3.6L.

I've seen my OEM cats side by side with a set of L99 cats and it appears Chevy is using the same cats on the 6.2L and 3.6L (cost cutting decision?), so I'm hopeful the OEM will hold up on my LLT.
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Old 02-14-2014, 05:12 PM   #14
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back together today, all I can say is wow....

drivability is so much better.. Now to get the tune checked and see what my AFR is reading to be on the safe side, after removing the guts of the melted cats it may be a bit leaner. It sounds and runs like a new car. If you are having any drivability problems, check your cats. I should have done this months ago as my trap speeds fell from 109 to 104. That should have been the first clue....
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Old 02-14-2014, 05:52 PM   #15
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Old 02-23-2014, 12:24 PM   #16
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As per cats.. This is a GENERAL statement, the high-flow aftermarket cats I have seen more failure rates with on high boost applications (So preemptively we remove them if need be), as I have also seen them last at 800rwhp. Factory cats are actually a lot better construction than aftermarket and hold up to the temperature better.

Obviously there are other conditions such as AFR/Timing, etc. that can knock out cats, but we are pretty conservative on this combination as it makes great power with the good parts that are on the car.
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Old 03-13-2014, 07:03 PM   #17
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Supercharger plus Cats = baddddd

Wow that's crazy. I'm glad I checked this out. Seems like its worth it to go back to the stock cats and just sell them? How many people have been successful running the solo cats wit a S/C?

Edit: maybe because I am an LFX it may not do the same damage as it would to an LLT with headers?
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Old 03-13-2014, 07:15 PM   #18
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Wow that's crazy. I'm glad I checked this out. Seems like its worth it to go back to the stock cats and just sell them? How many people have been successful running the solo cats wit a S/C?

Edit: maybe because I am an LFX it may not do the same damage as it would to an LLT with headers?
No you will have the same fail rate. Clint "Sycraft" owns a LFX and he was the latest to report cat failure in here. After removal he reported all was good again.

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Old 03-13-2014, 07:21 PM   #19
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No you will have the same fail rate. Clint "Sycraft" owns a LFX and he was the latest to report cat failure in here. After removal he reported all was good again.

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No way! I was just reading a bunch from him saying he was all good (they were older). I guess my cats will be up for sale next month. And from what I read the stock cats can handle it. I don't think I would pass emissions with gutted cats in NY. Thinking about it so I could pass a visual
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Old 03-13-2014, 07:42 PM   #20
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Visual is easy, just gut the solos....
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Old 03-13-2014, 09:18 PM   #21
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Supercharger plus Cats = baddddd

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Visual is easy, just gut the solos....

Yeah but when they hook up my exhaust and run the emissions. I'm screwed lol. I think I'll just go back to stock...how lame but at least it's safe
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Old 03-13-2014, 10:23 PM   #22
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green cats are no different..i had them and they blew out at 676 rwhp
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Old 03-13-2014, 10:27 PM   #23
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green cats are no different..i had them and they blew out at 676 rwhp
Lol it might be a while before I get anywhere near those numbers...if ever
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Old 03-14-2014, 01:30 AM   #24
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Lol it might be a while before I get anywhere near those numbers...if ever
just saying... lol
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Old 03-14-2014, 12:22 PM   #25
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I normally don't post here but had read something that could be of interest. The ZL1 factory tune has "Cat Over temp Protection fuel". AKA the tune enriches up to prevent Cat failure. Other tuners add them into the V8 tunes they do.... some do not. Here is an example of one that does. (Sponsor and the car is a ZL1 so there is that.)

http://www.camaro5.com/forums/showthread.php?t=329519

Here is the important bit.

http://www.camaro5.com/forums/showpo...00&postcount=7

The AFR fattens at the top of the RPM to prevent overheating the Cats.
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