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05-05-2013, 04:07 PM | #1 |
Scooby Specialist
Member#: 295911
Join Date: Sep 2011
Chapter/Region:
NESIC
Location: CT
Vehicle:2015 WRX LR |
Catless downpipe discussion
So I recently purchased a catless downpipe for my 2011 subaru wrx. The catless downpipe I purchased uses a divided design in contrast to the bell mouth design. From what I have studied and understood, the divided design is utilized to help separate the main stream of exhaust gases, from the gases used to bleed of from the internal waste gate.
It is common knowledge that the catless downpipe design can, and usually does create a boost creep situation, that cannot be remedied through tuning solutions. Due to this flaw, the use of an external waste gate must be installed to accurately regulate boost levels. This all leads me to the question of why would companies design a product with a design the is aimed towards one setup (internal wastegates) while the product itself almost always requires a different setup (external wastegate)? Am I looking at this the wrong way while there are other solutions to this issue(and if I am, please advise me on my best direction to go into) or are these products truly counteracting their purpose? I understand that companies like the one who created the product I purchased have years of research and development with their design, but this just seems crazy to me. Please, no flaming, and no pissing contest on which product is better/ bashing reputable companies. Just looking for someone with maybe a little more experience or just complete knowledge on why these products were created this way. Thanks in advance. -Teddy
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05-05-2013, 06:56 PM | #2 |
Scooby Specialist
Member#: 197384
Join Date: Dec 2008
Chapter/Region:
NESIC
Location: MWV NH
Vehicle:2006 WRX Ltd OBP |
I'm running catless on a VF 39'd rex (stock bc) without issue. Not sure how much difference sti heads make, but why wouldn't it be doable with proper time spent on tuning WG and dynamics?
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05-05-2013, 08:30 PM | #3 |
Scooby Specialist
Member#: 268354
Join Date: Dec 2010
Chapter/Region:
NESIC
Location: Massachusetts
Vehicle:02 WRX 05 LGT Slow Automatics |
Catless works fine for larger turbos and SOME stock turbo cars. You just roll the dice. I've had identical cars, one creep to 20+psi and the other behave almost perfectly.
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05-06-2013, 08:44 AM | #4 |
Scooby Guru
Member#: 70395
Join Date: Sep 2004
Chapter/Region:
MAIC
Location: Da-boonies,Va
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Because you obviously don't understand what the definition of "boost creep" is.
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05-06-2013, 08:50 AM | #5 | |
Scooby Guru
Member#: 70395
Join Date: Sep 2004
Chapter/Region:
MAIC
Location: Da-boonies,Va
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05-06-2013, 12:20 PM | #6 |
Scooby Specialist
Member#: 335445
Join Date: Oct 2012
Chapter/Region:
MAIC
Location: Ashland, VA
Vehicle:2012 WRX - BLK STIG Stg. 2 - 287whp/317wtq. |
They also do not build cars with the forethought that you will remove an integral part of the car. It was designed to work in conjunction with a cat, and in this respect, it functions appropriately. It's a shame, but you have to pay to play!
Last edited by Cathexis; 05-06-2013 at 01:23 PM. |
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