S2 stock cat and HJS cat questions - Page 3 - RX8Club.com



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Old 09-19-2017, 10:09 AM   #51
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They know cat converters and some specific applications, but not necessarily the details regarding rotary engines or their needs. That's one of the reasons this forum exists. They likely just looked at the displacement without understanding what was already brought up in one of my earlier posts. They should be fine temperature wise. I would strongly encourage you to go larger whenever possible. I wouldn't go smaller than the one Steve bought unless you are on a strict budget. For all out performance I recommend larger ... in either case unless you intend to keep the car for a long period you might think twice about making the investment in one. These are the best, but do you need the best?
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Old 09-23-2017, 05:27 PM   #52
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He said wankelmotoren.




Anyway, I can't guarantee that what I chose to do will work for anyone else, and I have limited time on mine. I have abused it more in a short period of time than most people would, and it has stood up to that abuse, but the data set is very limited.
MSR YAY! I miss MSR




So, this is not a complaint, but more something that might expand this thread.

So my catalyst gutted itself? Dropped the exhaust to get to the clutch and it is empty in there. I didn't gut it myself, (I guess the original owner could have and just stealth-ed it, but it was heating up about 5k miles ago...and no P420 10k ago, but no P420 now somehow?)

Again not bitching, but will no cat (not deleted just gutted) throw off the rear o2 comp table? Worth gutting a cat vs price of aftermarket pipe? (Assuming it guts itself like that.....) Mention this to o/p?

(Not getting a CEL or MIL so I don't really care that much about that now that I don't have to pass emissions, plus I can just disable that chain if it comes down to it)

I can't tell how long this has been gutting itself, but I saw an increase in fuel economy, the car blows flames when you egg it on, and the rear o2 doesn't hang around 2k bbq range.

Can you change the tuning a bit since your not feeding the cat to keep it from roasting you to death?

Last edited by badinfluence; 09-23-2017 at 05:32 PM.
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Old 10-08-2017, 06:03 AM   #53
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They know cat converters and some specific applications, but not necessarily the details regarding rotary engines or their needs. That's one of the reasons this forum exists. They likely just looked at the displacement without understanding what was already brought up in one of my earlier posts. They should be fine temperature wise. I would strongly encourage you to go larger whenever possible. I wouldn't go smaller than the one Steve bought unless you are on a strict budget. For all out performance I recommend larger ... in either case unless you intend to keep the car for a long period you might think twice about making the investment in one. These are the best, but do you need the best?
team knows what he is talking about

I custom made 1 with hjs couple years ago, much BIGGER than this 1, it's been DD in 1 of the RX8 here, been what 3-4 yrs no issues whatsoever, and it pass MOT(emission testing) with flying colors, it also has 90% flow, Euro 5(now Euro 6) emission.

but yeah, do you need the best? that's the question.
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Old 10-09-2017, 01:05 AM   #54
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I do plan keeping the 8 for a while.

I have looked through the different options. Catless is stinky and not bumper-paint-friendly. S2 OEM is hideously expensive. The only cheap one that's said to work is the Magnaflow 59959, but there doesn't seem to be any active members that can provide any feedbacks for that one.

I think what I picked is enough for me. I do plan on bringing the car to some AutoX events next year.

Charles just finished the combo and shipped it out. Can't wait for it to get here.
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Old 10-09-2017, 06:48 PM   #55
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team knows what he is talking about

I custom made 1 with hjs couple years ago, much BIGGER than this 1, it's been DD in 1 of the RX8 here, been what 3-4 yrs no issues whatsoever, and it pass MOT(emission testing) with flying colors, it also has 90% flow, Euro 5(now Euro 6) emission.

but yeah, do you need the best? that's the question.

Haha, I put my super-size cocktail shaker up for sale the other day on the forum because Iím modifying the car for a higher preparation non-emissions race class now. Iím also am in the process of doing the header modification we talked about several years ago using a 2Ē/50mm version from Leg Motorsport.
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Old 10-10-2017, 12:34 AM   #56
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Haha, I put my super-size cocktail shaker up for sale the other day on the forum because Iím modifying the car for a higher preparation non-emissions race class now. Iím also am in the process of doing the header modification we talked about several years ago using a 2Ē/50mm version from Leg Motorsport.
Aren't you a stinker...

(Pun totally intended)
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Old 10-10-2017, 01:22 AM   #57
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Understatement of the year
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Old 10-13-2017, 06:58 PM   #58
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So I just got the BHR pipe today.

The pipe looks great, but there is this one little weird thing I have noticed. There is this dirt-like stuff in the cat. I mean, the cat wouldn't come pre-clogged, but I am just wondering if I need to clean it out before putting it on.

Any ideas?
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Old 10-13-2017, 07:20 PM   #59
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Never seen anything like than on any HJS cat converter before. Can I see a side view pic of the outside?



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Last edited by TeamRX8; 10-13-2017 at 11:36 PM.
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Old 10-13-2017, 07:24 PM   #60
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unknown: which cat did BHR put on? (I can't remember off the top of my head what Ray uses for the "catted" option) I saw mention of a Magnaflow earlier but wasn't sure if that's what we're looking at in your pic.

I'm with Team, can we get a side profile shot of it?
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Old 10-13-2017, 08:07 PM   #61
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He said earlier in the thread that an HJS cat was purchased from Germany
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Old 10-13-2017, 09:24 PM   #62
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It's the 90 95 0182 HJS Tuning cat.

It doesn't look like those clogged cats and looks like if you have a long, thin needle, you could poke everything out.

And here are the photos.


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Old 10-13-2017, 11:36 PM   #63
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Well it’s hard to tell looking at pictures. The weld on the interior seems a bit rough compared to the outside, no biggie though.
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Old 10-13-2017, 11:47 PM   #64
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Well it’s hard to tell looking at pictures. The weld on the interior seems a bit rough compared to the outside, no biggie though.
Everything is done by BHR, as I drop shipped the cat to Charles.

Overall it's not bad, but the cat does look strange.

I contacted Charles and will see his response.

I asked someone at my work(who worked on cars before) and he said it might just be imperfection in the production of the cat. I will take it to a shop tomorrow and ask their opinions, too.

Edit: Did a bit of research. What my coworker suggested was that the cat was dipped in something, and there were some bubbles that didn't pop. Sorta like when you dip a screen in water, and you have some holes with bubbles over them. I found out that some metallic cats do get dipped in a liquid ceramic, so that's probably what that stuff is. Just an educated guess.

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Old 10-14-2017, 01:17 PM   #65
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Well I’ve only had direct experience with the motorsport cats and they were always clean as a whistle. I suppose that means you didn’t get to receive and inspect it before the installation.

Email this guy, he handles technical support for the HJS tuning cats

[email protected]


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Old 10-14-2017, 06:05 PM   #66
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Well I’ve only had direct experience with the motorsport cats and they were always clean as a whistle. I suppose that means you didn’t get to receive and inspect it before the installation.

Email this guy, he handles technical support for the HJS tuning cats

[email protected]


.
No, I didn't get to inspect it as it was sent to Charles.

I talked to one of the guys at the local exhaust shop today. He said he would be a bit concerned about this.

Thanks for the help, Team. I will shoot an email to both HJS and Turbo Zentrum.
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Old 10-16-2017, 07:57 AM   #67
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The honeycomb in mine was perfect. I saw nothing like that. After sending it to BHR to be re-welded, it still looked perfect.
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Old 10-16-2017, 02:20 PM   #68
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Thanks for your input.

Turbo Zentrum replied my email and told me it's fine and the bits will blow out. I will see what HJS says.
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Old 10-17-2017, 09:54 AM   #69
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Thanks for your input.

Turbo Zentrum replied my email and told me it's fine and the bits will blow out. I will see what HJS says.
I was not worried about the cat because of HJS's reputation and the fact their cats are rather well-proven in this community. I hope this does not end up being something of concern.
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Old 10-17-2017, 12:17 PM   #70
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HJS just got back to me and also said it's fine.

It's basically just some leftover coating and they said it will just blow out.

Good. Getting it put on today. Very excited.
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Old 10-17-2017, 10:29 PM   #71
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Got mine installed by an exhaust shop today. Yeah, I could do it myself, but it would take too long and it would be too much effort.

I love it so far. I took it out for a spin, and my gas mileage has improved quite a bit(btw, my old cat had been killing my gas mileage recently). There is almost no stank, so that's great.

I will see what happens down the road. My initial impression has been good.
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Old 10-18-2017, 07:30 AM   #72
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"...but it would take too long and it would be too much effort."

I'm not 100% sure, but I think UJ might be a poser hoser or something.
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Old 10-18-2017, 12:07 PM   #73
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Says the guy who made a 4 hour round trip drive just to have camber bushings installed
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Old 10-18-2017, 01:22 PM   #74
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"...but it would take too long and it would be too much effort."

I'm not 100% sure, but I think UJ might be a poser hoser or something.
The thing is, I have tried inspecting the cat myself(with a bit of help from grandpa as well). It was a very frustrating experience with us ending up breaking some parts. With the limited tools I have, it really wasn't something I want to attempt again.
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Old 10-18-2017, 03:26 PM   #75
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Says the guy who made a 4 hour round trip drive just to have camber bushings installed
Hey, I own property out there near Acton, and it was a multi-purpose combined trip to meet with a home builder!
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