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08-29-2018, 02:28 PM | #23 |
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Of course. I don't have a valvetronic exhaust right now but I know for a fact that when the valves are closed even with a catless X-pipe setup its practically just as quiet as stock. My friend had this setup when he had a E92 M3 with the Kreissieg exhaust.
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08-29-2018, 02:32 PM | #24 |
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Based on my wonderful experience with HFCs in the primary position, I would not run primary cats at all in a track car. Definitely wouldn't use a test pipe with welded-in HFCs either
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08-29-2018, 09:38 PM | #25 |
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What about valved exhaust with test pipes?
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08-30-2018, 12:37 AM | #26 | ||
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08-30-2018, 02:10 AM | #27 |
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Can you clarify what the risk is running stock cats at tracks? Done about 16 track days in my car so far, stock cats, stock mid pipes, aftermarket muffler. No problems so far. Switching to MPE soon due to Laguna Seca sound issues. Been failing sound lately.
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08-30-2018, 03:25 AM | #28 |
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The cat can collapse and not let exhaust out. See his thread on engine malfunction.
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08-30-2018, 08:10 AM | #29 | ||
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Even before Shadow posted this news my shop MRF warned me about this exact thing and the first and only time I tracked this car I got a catalytic error code - which may be simply coincidental - but the warning signs are there and as the saying goes, "those who don't study history are doomed to repeat it"
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08-30-2018, 09:19 AM | #30 | |
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Different in that you run it hard as hell, whereas HPDE events are often 20 minute or some runs. You see where I am trying to go here? Makes sense? I'm thinking worrying about cats wouldn't really apply to drivers like me. I did 5 events in the past 8 years lol! |
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08-30-2018, 09:26 AM | #31 | |
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08-30-2018, 09:41 AM | #32 |
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These seems like an Evolve or similar catted-x pipe situation, with cats still in the secondary position and resonators
I have the AFE, and I like it, mainly because still have no CEL after what like 4,000 miles on it, but my personal opinion is it would still be pretty loud with the stock back box, and fit like crap, because I had to adjust the slip joints at the MPE muffler to get it to line up right. But that's just like, my opinion man. I wouldn't recommend this xPipe UNLESS you want to keep O2 monitoring readiness unaffected, in which case, you at least have a decent chance as I did.
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08-30-2018, 12:56 PM | #33 | ||
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With a large BBK and RE71Rs I can stay out on track for over 30 min in 100+ heat and that's the part that worries me about the stock cat collapsing. I'm not cruising around either....last time at Thermal we were flying with it faster than ZL1, Cayman R, a highly modded e92 M3 (trailered) and only a few seconds off a 991 GT3 and 458.
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08-30-2018, 02:13 PM | #34 | |||
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Is it not feasible to have a cat bypass that can be opened and closed to reroute airflow through cat or around it? I guess such an ideal an obvious solution would destroy sales. |
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08-30-2018, 02:23 PM | #35 |
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There's no space for anything like that under the car.
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08-30-2018, 06:09 PM | #36 | ||||
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08-31-2018, 05:55 PM | #37 |
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Umm holy mama. I've done about 16-18 days at tracks in the past 12 months or so. Running high intermediate or advance group, depending on which organizer is running it. Usually 20-25 minute sessions.
Should I be worried? My pacing isn't super fast, but I think decent. (1:44.89 @ Laguna with RE71R and mostly stock car for example) And if I should be worried, what's a good solution without killing myself come CARB/smog time? |
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08-31-2018, 06:09 PM | #38 | |
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The brick inside the cat is not typically what fails, it's the substrate around it that burns up. You see this often in modified cars without tunes -- they tend to run rich and dump unspent fuel into the headers, which detonates in the cats.
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08-31-2018, 06:10 PM | #39 | |
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If you don't mind the additional noise a catless x pipe will get rid of the risk but for smog you would have to swap back the stock x pipe and there are some additional prep to get the OBD into readiness which I understand is a bit of a pain in the ass. My issue is bit more problematic because i want to remove the primary cats while keeping stock noise level.
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08-31-2018, 06:20 PM | #40 | |
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08-31-2018, 08:11 PM | #41 | ||
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09-20-2018, 07:55 PM | #42 | |
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09-21-2018, 12:07 PM | #43 | ||
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09-21-2018, 12:14 PM | #44 |
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I've decided to run the Akra X-pipe, but match it with the Dinan rear section.
The Dinan seems reasonable and the Akra seems like it will take a lot of abuse. What I hear from you though is that this setup would still be too loud for your 0.0% tolerance. For me it sounds good enough, doesnt stop local cows from giving milk, and withstands track session that should light the car on fire. For "reference" comparison, I had the Sharkwerks and BBi on my TTS and thought both were intolerably loud. Now on a Kline inconel setup with Kline inconel equal length headers. I don't like loud. I like good. |
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