Install: Eastern 3" 200 cell metal core cat
06-18-2008, 02:59 AM
#21
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How is "less work" a cost/price?? :-p
Any chance of you both measuring the OD of the middle part?
It's not much different to comparing the flow through an intercooler via overall area and surface area. I forget the figures, but my GTR cooler is something like 25% or 33% larger in area through the core than through the end pipes. Those cats look similarly proportioned. The flow should just about match a straight piece of pipe if you oversize it the right amount for the effect the walls of the cells have on average velocity.
Considering 3" is plenty big anyway, I'd hazard a wild guess and say the 300 cell one would still be adequate in flow for more or less any bp of fe, and way way big enough for any b6. I'd also guess that the 200cell one would be pretty much similar to a piece of tube. Wild guesses though :-)
Given the new noise laws that JUST came into place in NZ I think I might end up with a cat just to muffle things a bit further.
Fred.
Any chance of you both measuring the OD of the middle part?
It's not much different to comparing the flow through an intercooler via overall area and surface area. I forget the figures, but my GTR cooler is something like 25% or 33% larger in area through the core than through the end pipes. Those cats look similarly proportioned. The flow should just about match a straight piece of pipe if you oversize it the right amount for the effect the walls of the cells have on average velocity.
Considering 3" is plenty big anyway, I'd hazard a wild guess and say the 300 cell one would still be adequate in flow for more or less any bp of fe, and way way big enough for any b6. I'd also guess that the 200cell one would be pretty much similar to a piece of tube. Wild guesses though :-)
Given the new noise laws that JUST came into place in NZ I think I might end up with a cat just to muffle things a bit further.
Fred.
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Those are what I use.
06-18-2008, 09:58 AM
#26
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re: Cost - my obscure effort at confirming the differences. Believe it or not cost is used in reference to things other than $. 
All the 3" metal cores have a 4" center section/body AFAIK. I might have considered the magnaflow but didn't realize it existed- and the sales dood didn't mention it. But at the time I was aiming at a 200 cell unit based on what I was reading. Of course seeing the difference between this 200 and the old 400 ceramic, I doubt there's much of a difference between the 200 and 300 metal cores (at our power levels).
All the 3" metal cores have a 4" center section/body AFAIK. I might have considered the magnaflow but didn't realize it existed- and the sales dood didn't mention it. But at the time I was aiming at a 200 cell unit based on what I was reading. Of course seeing the difference between this 200 and the old 400 ceramic, I doubt there's much of a difference between the 200 and 300 metal cores (at our power levels).
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06-19-2008, 06:36 AM
#29
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06-19-2008, 08:32 AM
#30
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that's awesome^ that'd pass here... they just stick a "bomb" mirror under the car and look. I decided to be legal on this one and keep the guts, but I'd considered running a 3" pipe thru an old cat can I have.
Tho at that price $40, it wouldn't be worth the work. I'm surprised its polished- that's a little conspicuous.
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06-19-2008, 11:05 AM
#31
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I seem to recall a while back that Corky built an exhaust system which had two "normal" cats in parallel. I would tend to expect that such a system would be a real winner, both from a performance and an emissions standpoint.
It's a shame that I can't seem to find any before / after data comparing a traditional high-density ceramic cat to a coarser spun metal cat on a smog-check dyno. Seeing those numbers would mean a lot...
It's a shame that I can't seem to find any before / after data comparing a traditional high-density ceramic cat to a coarser spun metal cat on a smog-check dyno. Seeing those numbers would mean a lot...
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06-19-2008, 11:31 AM
#32
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it really depends on how big the core is. it takes roughly two 2-1/4" pipes to equal a 3" in terms of flow area so you have to start there. but most cats use the same cores dont they? in theory you'd get half the restriction.
I wonder what it does to the heat in the catalyst. and how you'd fit it. I've always envisioned a simple offset setup to reduce the width (or height).
I wonder what it does to the heat in the catalyst. and how you'd fit it. I've always envisioned a simple offset setup to reduce the width (or height).
Code:
___/-CAT1-------\_____ \-------CAT2-/
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06-19-2008, 12:06 PM
#33
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I noted that my new 2.5" Magnaflow cat appears to provide about 75% greater frontal area on the core than the OEM cat did, with roughly identical core construction. So that's gotta be a signifigant improvement.
Code:
___/-CAT1-------\_____ \-------CAT2-/
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