count me in for this new high flow cat as well chuck.
provided you actually make them.
One question to everyone though.From what I understand some of the high flow cats come with the air pump bung and some dont.Will this rotary extreme high flow cat have the air pump bung or not? And if it does and I decide to remove the air pump how can I close that air pump bung up? Just a few things im curious about.
But above all Chuck. Now that this info has come to my attention I absolutely want the metal cat.Im sure you will have a lot of sales for this puppy.Especially if it flows almost like a midpipe but without the dangers that come with a midpipe.Keep us posted.or at least keep the site posted as I visit it regularly.Thanx Chuck.

 

Chuck is working with the supplier to fab the cat. My car will be the test car.... .....

We will be testing power gains on the dyno as well as emissions testing.

 

kick ***.let us know how everything turns out rynberg.

 

Now, that is ironic

 

Empire,

I have the Metalit super catalyzer made by Knightsports. The cat has 2 outlets. One for the air pump and the other goes to a cat sensor to check heat. My FD is a US version and does not have the cat sensor. Knightsport supplies a gasket w/cap and screws to close the cat sensor outlet.

Hello Rynberg,

I agree the price is not cheap. Back in january 2003. I did not know anyone on this forum or in europe who had the KS cat. I felt it was a better product compared to others which were on sale at the time in the States.

The Metalit technology sounded perfect to handle the Rotary pulse and heat. With increased flow along with HP gains. The Metalit cat numbers were close to or equal to that of a midpipe in performance but most important to me...... it passed Japans hardest emissions test.

Unfortunately, I do not have any of my own test comparing the KS to a stock cat/ aftermarket highflow or a midpipe. I do have a dyno run taken in Oct 2003 on my FD. I am affraid it might not show justice. I only made one run and I am very conservative when it comes to shooting for high hp numbers. I can post it if you like?


DaiOni,

Does the test mention what year or what mod's the FD was using? There are 2 KS cats. Pro version and Metalit super pro spec.
Before I purchased my Matalit cat I was given this information around Feb of 2003.

Test: FD3S- dual front tube + FD763 type-Z muffler installed: Do not know the yr. of the FD?
HP -
Straight - 330 ps (7000 rpms)
KS cat - 330 ps (7000 rpms)
Genuine - 300 ps 7000 rpms)

Torque -

Straight - 36 kg/n (6000 rpms)
KS cat - 37 kg/n (5500 rpms)
Genuine - 33 kg/n (6000 rpms)

Boost -

Straight - 1.0 kg/cm2 (6000 rpms)
KS cat - 1.05 kg/cm2 (5500 rpms)
Genuine - 0.94 kg/cm2 (5000 rpms)

Hello Chuck,

If you need any measurement ( for comparison) to help you construct your cat. Don't hesitate to ask. I also have a few papers which show emission tests from Knightsports. They are in Japanese and will be happy to send a copy to you.


Twokrx7,

For comparison, the KS diameter is 80 mm in/out which is 3.15 inches and round shaped.


Here is a photo of my metalit cat.

//Oliver

 

Mr. Stock,

I have not see the site from Emitec before. Nice information.

Thanks for posting that,

Oliver

 

OC great info!!!

Thanks for the post...and that is a beautiful cat!

 

Thanks 7racer




closer photo of the canister




Matalit cat installed

 

Does the Metalit cat require an air pump to avoid clogging? I know the need for an air pump on any cat is debatable. However, there seems to be some consensus that the stock cat's life span will be shorted if it is used without an air pump.

I want to note that the air pump on GM f-body cars runs only on cold start and for less than 4 minutes. The C5 vette has a similar setup. The new C6 apparently does not have an airpump at all. I hope that this reduction in the need for air injection is due to advancements in cat technology, that can be used for the FD as well, and not changes to extrinsic parts.

Great thread!

 

Oliver, I took your dimensions on the cat and roughly figured the large diameter of the cat is about 4-3/8", can you confirm?

I wonder if I can fit two of them under the car in case they do not sell a true 4" id version. Probably overkill but it would really cut down on exhaust noise in addition to flowing like crazy.

 

CCarlisi!

Great point! That would eliminate some fitment issues with that damn airpump!

OC...do you know of any data on this issue?

 

It wasn't a KS test - it was done by r-magic for hyper rev magazine and was performed with their latest project car. Performance mods include (stock turbos), apexi intakes, r-magic v-mount, cat-back, dp, ngk plugs and performance leads, power fc, bigger fuel pump. They claim 370hp (ps) - not sure how that would translate on a US dyno.

I find it very interesting that the figures you list show that the ks cat lifts boost higher than a straight pipe! and has the hp! more torque!

I'd like to see an independant test, but if that's true, it's interesting

 

I just measured the cat. It is 110mm or 4-1/16" in diameter.
You were damn close!

//Oliver

 

Thanks for the information.

I found it interesting as well but was never shown a actual test sheet just an email with numbers. The person who gave me the figures is named Ant at Reworx in the UK. www.Reworx.com

He spoke to the sale manager named Takeshi at KS. He may or not be the person who gave Ant the numbers??
Since your in Japan. Maybe you could call them and ask about the HP/Torque numbers?

//Oliver

 

i would rather stick with the bonez

 

I found a local shop in houston that is selling one of these new technology cats in a 3" in/out version. Not sure who they buy it from but if I get a look at it this weekend I'll post back. They sell the cat for $190, ready to be welded in I believe.

 

For those in japan - while KS do sell them, check out some of the mail order retailers (in option mag, etc) - I've seen them advertised a lot cheaper

 

Invidia brought this exact technology to showcase at SEMA.

http://www.overboost.com/pix.asp?ima...l/IMG_0461.jpg

"...Invidia has developed a catalytic converter that is so efficient, a three-inch diameter roll of their catalyst is all that's needed to maintain emissions compliance. And a three-inch roll of catalyst can easily be stuffed into a down pipe or exhaust pipe. The advantage is that the exhaust gas doesn't have to expand into a large chamber and then get squeezed back down to pipe-size."

1) RS-R and Invidia have a history (I thought this was interesting)...
http://www.rs-r.com/rsr_statement.htm

2) I don't know if Invidia has incorporated this new technology in their product line or not.

3) I am not making any recommendations on Invidia products. I am only posting the info that I found.

BTW, yes I have met the guys at Invidia and have seen their products up close. I have no comment.

 

Does anybody have the contact info for a us distributor of the cat brick? I sent emitec an email yesterday asking the same question, but the site is apparently hosted overseas so I think my chance of getting a response is slim.

 

My brother used some very similar, supposedly "ultra clean" cats in the Future Truck project at U of Md. What he showed to me was basically a 2.5" tube packed with this stuff (like the pic) that they welded into the collectors on the truck. I'm pretty sure they picked it up from someone in the NE. I just emailed him for more info but he's out of town this week. I remember a number like $150 or so for that section of cat, but that was 2-3 years ago.

Interesting side story. At the competition someone screwed up the dyno settings for the MD dyno pull & emissions test.. they added another 2000 lbs to the test load. The truck almost overheated (pistons tagged the spark plugs from the rod stretch and it died) but with these cats running, they had the cleanest emissions at the competition (cats were glowing red). When they retested it later with the correct load, emissions were close to the same.

 

uhh...davesport all metal cat...uuhh... cool

http://www.davesport.com/cgi-bin/dav...ml?id=5STGKFtY

138 bucks.

granted its not all shinny and polished...but its gonna be UNDER the freakin car...

john

 

Hey Chuck, hows it going? im in OAKLAND wow i didnt know of any RX7 parts shops in the bay area except for M2...cool. anyway, my dad and i both have FD's... his is a 94... completely stock except for a efini y pipe, DP, and K&N filter in the stock box. id offer the car up if you want to do a dyno or smog station test. i just smogged it a month ago so you'd have some recent results to compare to. anyway, im impartial and stuff hehe, and glad to do my part in the R&D sector for the FD ... let me know if i can be of assistance.

on a side note, i was just about to buy a pettit HF for my 20b project car (motor is not mounted yet... im still getting the engine bay ready) but maybe ill hold off and see how this metal cat stuff pans out. the 20b would be a perfect platform to test longevity and how the cat holds up to exhaust pulse, heat, etc since the 20b will undoubtedly give it a harder beating than a 2 rotor

-heath

 

I need one of these cats, too. Put me on the list, Chuck.

 

oliver (sorry maybe you stated this earlier up) but how much was that CAT??

 

a month and a half bump....

did anything come of this? rynberg, did you get a metal cat to try out?