highflow cats
Oct 21, 2009, 09:13 AM
#32
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Mil.Spec is the only true 3" 100 cell cat on the market at the moment....
for install buy a test pipe, cut to the approx. length and have the 100 cell welded in between the two halfs...
https://www.evolutionm.net/forums/ev...available.html
evo 8/9
3" INLET/OUTLET CAT
for install buy a test pipe, cut to the approx. length and have the 100 cell welded in between the two halfs...
https://www.evolutionm.net/forums/ev...available.html
evo 8/9
3" INLET/OUTLET CAT
Oct 21, 2009, 11:51 AM
#36
I noticed Mil.Spec compared their results vs aftermarket ceramic cats. I wasn't aware there were any aftermarket ceramic cats made for the Evo X, so why the comparison? How well does the Mil.Spec flow versus a similar product such as the Invidia which also uses a 100 cell metallic cat, or Harman Motive who uses 200 cell, or AMS which is 300 cell, etc?
Regardless I'm still getting the AMS hfc, but just would like to know what slight differences there may be.
Edit: not sure, but I don't think there's any ceramic cats available for the 8/9 either...
Regardless I'm still getting the AMS hfc, but just would like to know what slight differences there may be.
Edit: not sure, but I don't think there's any ceramic cats available for the 8/9 either...
Last edited by Frankiago; Oct 21, 2009 at 11:56 AM.
Oct 22, 2009, 09:18 AM
#37
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Here's a back to back dyno of our Metal Substrate High-Flow Cat versus our Mini-Muffler Test Pipe (straight through). Special thanks to mad_viii for dyno'ing these parts.
http://s331.photobucket.com/albums/l...SSC_HP_AFR.jpg
Darryl
www.ultimate-racing.com
http://s331.photobucket.com/albums/l...SSC_HP_AFR.jpg
Darryl
www.ultimate-racing.com
Oct 22, 2009, 06:07 PM
#38
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MIL-Spec. If you dont want smell but still great performance, the Mil- spec is out flows as far as i know everything in the HFC world.
Do a search button and you will see it. They are here in the forum too. Its a true 100 cell metallic converter. Less longer etc.
I running one of they product and i love it. Also no smell what so ever. Unless you are running on race gas
i have picture from my set up if you need it.
Do a search button and you will see it. They are here in the forum too. Its a true 100 cell metallic converter. Less longer etc.
I running one of they product and i love it. Also no smell what so ever. Unless you are running on race gas
i have picture from my set up if you need it.
I had RRE weld my 100 cell into a removeable piece with flanges. This way I can drop in a test-pipe or stock cat if desired.
Oct 24, 2009, 06:44 PM
#39
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You guys are concerned with pressure drop across the monolith. Stainless steel supports typically have less pressure drop than ceramic monoliths of the same diameter and will flow better. This is why performance cars usually utilize stainless steel catalyst supports.
Catalyst performance (destruction efficiency) is affected by residence time (the amount of time the hydrocarbons stay in contact with the precious metals). Longer residence times (often referred to as space velocity) result in higher destruction efficiencies. Performance is also affected by catalyst operating temperature, and precious metal loading. It is likely that the OEM catalyst has higher precious metal loading, and is carefully positioned to provide fast warm up and reduce the likelihood of overheating. Since the EVO often runs rich, this presents design challenges, ones that are unlikely to have been considered by the aftermarket. You can make more power with a less restrictive aftermarket converter, but don't expect it to do its job like the OEM one.
Catalyst performance (destruction efficiency) is affected by residence time (the amount of time the hydrocarbons stay in contact with the precious metals). Longer residence times (often referred to as space velocity) result in higher destruction efficiencies. Performance is also affected by catalyst operating temperature, and precious metal loading. It is likely that the OEM catalyst has higher precious metal loading, and is carefully positioned to provide fast warm up and reduce the likelihood of overheating. Since the EVO often runs rich, this presents design challenges, ones that are unlikely to have been considered by the aftermarket. You can make more power with a less restrictive aftermarket converter, but don't expect it to do its job like the OEM one.
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