Supercharged - Constantly blowing Cats.
10-07-2013, 05:31 AM
#21
This then begs the question, what about track cars that spend most if not all of a session in boost with an AFR of 11-12. Since I plan on occasional tracking the car (another vehicle will be my primary track car) I asked tech support at Random Tech this question. They said the limit was around 11.3-11.5. My target in boost is 11.69 so I may end up killing mine. We will see.
I've never seen my post turbo EGT's rise above 1300 or so by the end of a 1/4 pass. If the vibrant cats are rated to 1500, then I guess I'm good...in boost.
And we're all assuming the OP spends most his day in boost! This isn't the case!
When I say he may be tuned rich, I'm assuming he's driving around with 11-12 a/f in vacuum. This is the big killer of cats since thats what they would see 99% of the time.
'properly tuned' IMO means 14.7 in vacuum cells where the car spends most it's life, and where the cats do most their work. Not just full boost tuning...
And we're all assuming the OP spends most his day in boost! This isn't the case!
When I say he may be tuned rich, I'm assuming he's driving around with 11-12 a/f in vacuum. This is the big killer of cats since thats what they would see 99% of the time.
'properly tuned' IMO means 14.7 in vacuum cells where the car spends most it's life, and where the cats do most their work. Not just full boost tuning...
10-07-2013, 01:55 PM
#22
Dedicated track cars shouldn't have cats -- and if you do, make sure you choose them accordingly (at least a pair of 3", low cell count metallic). Mine have withstood over 100 1/4 passes and they are definitely less effective as they used to be, but they are far from blowing out or clogged.
10-07-2013, 02:52 PM
#23
This car will never be a dedicated track car. It'll be dual use and primarily street driven.
Dedicated track cars shouldn't have cats -- and if you do, make sure you choose them accordingly (at least a pair of 3", low cell count metallic). Mine have withstood over 100 1/4 passes and they are definitely less effective as they used to be, but they are far from blowing out or clogged.
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