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Universal High Flow Cat
I currently have turbo xs cat back and a turbo xs mid pipe. I am thinking about going to a high flow cat. Could i buy a universal 3" high flow cat and just weld it into my current mid pipe?
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Call up Rotary Performance http://www.rx7.com/store/rx8/rx8exhaust.html. Maybe they will sell you one of there super cats, so you can weld it into your current midpipe
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Below are links to some hiflow cats. I recommend the first one. After I found it, one member put it on his car and now has over 20K miles on this cat. The other two to my knowledge haven't been tried.
http://www.davesport.com/cgi-bin/davesport/DCAT100.html http://www.performancepeddler.com/de...T_ID=SUP200605 http://www.ppeengineering-onlinestor...sc?productId=5 |
Originally Posted by alnielsen
(Post 3588257)
Below are links to some hiflow cats. I recommend the first one. After I found it, one member put it on his car and now has over 20K miles on this cat. The other two to my knowledge haven't been tried.
http://www.davesport.com/cgi-bin/davesport/DCAT100.html http://www.performancepeddler.com/de...T_ID=SUP200605 http://www.ppeengineering-onlinestor...sc?productId=5 |
100 cpi will probably make more power (particularly with a good tune), but smell worse.
I've been running a Davesport for a year with no CEL issues. |
I was thinking of adding a high flow cat. Currently I have a straight pipe, but the lack of cat combined with some rich running with my turbo, yields some noticeable flames. That can get you into trouble with cops.
Would a High Flow cat eliminate that, or would fuel still get by it. Also, if you are running rich, would the excess fuel just kill the cat in an extremely short time, making it a futile gesture? |
Originally Posted by GaMEChld
(Post 3649803)
I was thinking of adding a high flow cat. Currently I have a straight pipe, but the lack of cat combined with some rich running with my turbo, yields some noticeable flames. That can get you into trouble with cops.
Would a High Flow cat eliminate that, or would fuel still get by it. Also, if you are running rich, would the excess fuel just kill the cat in an extremely short time, making it a futile gesture? extremely rich mixtures will cause even these catalytic converters to overheat and fail. If you have a mixture problem it's best to cure it first! Copied from 1 of those websites |
Thanks. Though I'm not sure if mine is all that extreme. Either way, I should get it tuned, so I might as well do that first.
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Isn't that why RX8's (stock) run so rich anyways, to preserve the life of the cat converter? Figured running lean would toast the cat faster than running rich?
Sorry for thread bump btw lol |
Rich runs cool, lean runs hot.
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if it's excessively rich and oxygen is present the cat converter will light it off internally like a blow torch
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Originally Posted by TeamRX8
(Post 3673859)
if it's excessively rich and oxygen is present the cat converter will light it off internally like a blow torch
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Originally Posted by alnielsen
(Post 3588257)
Below are links to some hiflow cats. I recommend the first one. After I found it, one member put it on his car and now has over 20K miles on this cat. The other two to my knowledge haven't been tried.
http://www.davesport.com/cgi-bin/davesport/DCAT100.html http://www.performancepeddler.com/de...T_ID=SUP200605 http://www.ppeengineering-onlinestor...sc?productId=5 |
Originally Posted by Renesis07
(Post 3673791)
Isn't that why RX8's (stock) run so rich anyways, to preserve the life of the cat converter? Figured running lean would toast the cat faster than running rich?
Sorry for thread bump btw lol http://www.imazda.com/forums/showthread.php?t=8389 |
Originally Posted by alnielsen
(Post 3588257)
Below are links to some hiflow cats. I recommend the first one. After I found it, one member put it on his car and now has over 20K miles on this cat. The other two to my knowledge haven't been tried.
http://www.davesport.com/cgi-bin/davesport/DCAT100.html http://www.performancepeddler.com/de...T_ID=SUP200605 http://www.ppeengineering-onlinestor...sc?productId=5 http://www.summitracing.com/parts/MPE-59959/ |
Originally Posted by Charles R. Hill
(Post 3674635)
I will soon switch back to my MazdaManiac tune since I am satisfied that the cat works as it is supposed to.
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Originally Posted by Charles R. Hill
(Post 3674635)
One thing people often forget is that (unless their car is a track-only car) they will spend the vast majority of their running time in closed-loop mode, wherein the PCM targets a 14.7:1 A/F ratio. Hardly rich and certainly not likely to roast a cat. The factory tune can get a bit rich at the upper RPMs but most of us don't really spend much time up there.
As an anecdotal, I have been using the DaveSport cat for over 1,000 miles and those first 500 my ill-maintained engine was randomly dropping into 10.8-11.0 A/Fs while on the freeway. This was during a recent trip to CA. I fixed the car when I got there and the engine and cat have performed flawlessly ever since. I am also running the factory mapping and I have no 420 CEL. I will soon switch back to my MazdaManiac tune since I am satisfied that the cat works as it is supposed to. The DaveSport cat inlet and outlet are actually 3.1" I.D. so installation on a 3" midpipe will require the midpipe to be stetched a bit before welding can take place. Im sure my hot air intake isnt helping anything, its only at idle that things get goofy, cruising around it seems to hover around 14.7 with no issues. |
CPI is just a general reference term. It doesn't necessarily mean much without also knowing both the total area and also the percentage open area. It's totally possible for say, a 300 CPI cat to outflow a 100 CPI cat. The devil is in the details ....
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