Japanese HF cats
[QUOTE=fletch]NoTecYou need to read this.http://www.randomtechnology.com/technical.html[/QUOT
Hmmmm? Not sure what to think!!
Hmmmm? Not sure what to think!!
JAMSA is very very strict on emissions. APEX'i developed this one thing for buses in Japan that is going to be converted to our cars to produce just as much power as a tuner exhaust, but less emissions then stock.
I don't know how anyone can justify running a $1000 dollar cat. The Helix cat which is also made out of rare metallic elements are only $299. It flows much better and clean than the old traditional ceramic design.
Thanks,
Tom
Thanks,
Tom
Evolving Member
Joined: Aug 2005
Posts: 450
Likes: 0
From: SO CAL
Originally Posted by Gruppe-S
I don't know how anyone can justify running a $1000 dollar cat. The Helix cat which is also made out of rare metallic elements are only $299. It flows much better and clean than the old traditional ceramic design.
Thanks,
Tom
Thanks,
Tom
Atleast here in cali it doesn't matter how clean your car runs on the sniffer, first off they are not OBD2 compliant and they would never pass visual.
I would rather run my Random technologies HF cat for everyday driving, and when it comes time for inspection swap in my stock exhaust and save the 1000 that are going thrown out the window when the operator fails you for an emissions violation.
Originally Posted by Evo Ate
Almost all of the time attack cars in Japan run these cats. They are available in roughly 3" and 4" sizes. Some of the nicest on the market are SARD and Apexi which can run from $600 to $1000. I might be talking out my a@@ but I think the Cyber Evo runs the SARD. Bring your pocket book. 
pocket book?? LOL?? unless you are a girl bring your "pocket book".... on the other hand if you are a man, you should bring your "wallet"
well i'm just saying.... the price of the a stocker to a high flow to a metal matrix isn't about the materials used. it's about the construction as always. you can see that they use radial cells in the jdm cats... that's pretty fancy pants... and prolly very expensive.
Hi guys,
There's many grades of high flow cats. The main difference is the construction of the mesh material and the how much rare earth elements is incorporated into the cats.
The cost of a cat is a direct function of the cell count and cost of the cat. Performance (exhaust flow) is dictated by cell count, and emissions cleaniless is dictated by the amount of catalyst. In other words a 200 cell cat is going to cost far more than a 400 cell cat because more rare-earth elements (catalyst material) is required within the cat to maintain the same emissions effect.
The ceramic cats (including the stock ones) should not be used in a high performance car. High EGT and exhaust flows cause these to fail on a regular basis. We frequently see low boost issues on an EVO caused by the disintegration of the stock cat thus clogging exhaust flow.
Metal substrate cats are the way to go on high performance cars due to their durability and ability to offer better emissions reduction at higher exhaust gas flow rates, but are usually not used due to cost. This is why you will find metal substrate only on high end cars, Porsche, BMW, etc.
The Helix high flow cats are 200 cell metal substrate units. They are the same cats found on several model Porsches as well as used by several aftermarket European and Viper tuners here in the states (the viper guys are using a 150cell 6" one though). Due to its purchasing network Helix actually is the distributor for these cats in Japan and in fact some of the $1000 JDM HF cats you will see use these very same cats (sometimes custom fitted into housings as specified by the buyer).
Therefore, I personally feel the Helix ones are the best bang for the buck high flow cats on the market. I would recommend them for use up to 400whp on the street, anything more powerful I would recommend looking at a custom solution. That said, if you're in the market for a high flow cat, it would make sense to stay from ceramic ones due to the higher failure rates.
Cheers,
Gary
Gruppe-S
There's many grades of high flow cats. The main difference is the construction of the mesh material and the how much rare earth elements is incorporated into the cats.
The cost of a cat is a direct function of the cell count and cost of the cat. Performance (exhaust flow) is dictated by cell count, and emissions cleaniless is dictated by the amount of catalyst. In other words a 200 cell cat is going to cost far more than a 400 cell cat because more rare-earth elements (catalyst material) is required within the cat to maintain the same emissions effect.
The ceramic cats (including the stock ones) should not be used in a high performance car. High EGT and exhaust flows cause these to fail on a regular basis. We frequently see low boost issues on an EVO caused by the disintegration of the stock cat thus clogging exhaust flow.
Metal substrate cats are the way to go on high performance cars due to their durability and ability to offer better emissions reduction at higher exhaust gas flow rates, but are usually not used due to cost. This is why you will find metal substrate only on high end cars, Porsche, BMW, etc.
The Helix high flow cats are 200 cell metal substrate units. They are the same cats found on several model Porsches as well as used by several aftermarket European and Viper tuners here in the states (the viper guys are using a 150cell 6" one though). Due to its purchasing network Helix actually is the distributor for these cats in Japan and in fact some of the $1000 JDM HF cats you will see use these very same cats (sometimes custom fitted into housings as specified by the buyer).
Therefore, I personally feel the Helix ones are the best bang for the buck high flow cats on the market. I would recommend them for use up to 400whp on the street, anything more powerful I would recommend looking at a custom solution. That said, if you're in the market for a high flow cat, it would make sense to stay from ceramic ones due to the higher failure rates.
Cheers,
Gary
Gruppe-S