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Originally Posted by IRPerformance
(Post 12211659)
461 whp/372 tq with our ported and studded motor, S360 single turbo kit, Bonez high flow cat, and Racing Beat catback. These numbers would equate to about 530hp on a Dynojet factoring in the 15% difference commonly found. The cat is not the issue.
Wouldn't it be logical to say that w/o the cat, the numbers you posted could only be improved? It would be interesting to see two back to back runs w/ and w/o the cat to show no difference at all. |
Does the Bonez not reduce/eliminate most of the smell? I was thinking about going with the Bonez this fall because my car stinks (midpipe)
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Originally Posted by MK3Brent
(Post 12211660)
Definitely not the original direction intended for this thread, but I am more than happy to help with education.
Wouldn't it be logical to say that w/o the cat, the numbers you posted could only be improved? It would be interesting to see two back to back runs w/ and w/o the cat to show no difference at all. |
Originally Posted by 7_rocket
(Post 12211662)
Does the Bonez not reduce/eliminate most of the smell? I was thinking about going with the Bonez this fall because my car stinks (midpipe)
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Originally Posted by MK3Brent
(Post 12211660)
Definitely not the original direction intended for this thread, but I am more than happy to help with education.
Wouldn't it be logical to say that w/o the cat, the numbers you posted could only be improved? It would be interesting to see two back to back runs w/ and w/o the cat to show no difference at all. |
Originally Posted by Topolino
(Post 12211567)
Recently went with a Vibrant Ultra High output cat (p/n 7830 from the link above) on my FD in conjunction with an EFR 7670 turbo. Have mostly used a Bonez high flow cat the last 10 yrs or so with Efini twins, and wanted to give the Vibrant unit a test run. Interestingly enough, we weren't able to boost higher than 10-11 psi on the new turbo setup. Not sure if the Vibrant cat is the primary restriction or not (but obviously no boost creep with it, either).
Seems to knock down the odors well-enough. Not sure if it can pass a legitimate emissions test, though. Universal catalysts - HJS Motorsport & Tuning |
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I may be the only 3 rotor guy to run a cat on his/her car. Wanted to get rid of the stink so tried a few units. Settled on the MBS 100 cell unit and have had it installed for around 3 years:
High Flow Catalytic Converters - Mandrel Bending Solutions Holds up to the heat of the rotary and eliminates a good bit of the stink. The 200 cell would eliminate more of the smell but I was worried about the restriction. And yes, you can make good power using a high-flow cat. Here is my dyno at 20 PSI: https://www.rx7club.com/attachment.p...1&d=1513343447 Made 716 WHP and 570 ft. lbs. |
David, do you have any pics of that converter installed on your setup? Assuming it's mounted pretty far downstream. The price sure as hell is right, and they seem to be nice and compact based on the pics on the site you linked to.
I may have to change my tune on this subject, once you stop learning and growing you may as well be six feet under, right? :rofl: Happy New Year all :icon_tup: |
Hey Rich. I don't seem to have a pic handy but will take one - once the car comes back from the body shop. A lady with a 1994 Buick Roadmaster station wagon backed into me a few weeks ago and it crunched the left side of my bumper. :(
As I recall, the converter is placed forward in the midpipe, not back, but I'd need to verify this as the work was done some time ago. Has held up well and cleans up most of the rotary stink. Zach at Addicted and I think there is little to no impact of the converter on WHP. If you were to use a higher cell count one (say 400 or higher) you'd definitely get a restriction so it's a matter of using a lower cell count and giving up some of its cleaning abilities. |
People need to stop thinking that a cat is going to inhibit your ability to make power. High flow cats are not really that much of a restriction at all and like IR Performance says, at 450, 500, 600, whatever horsepower you aren't going to notice 10 or 20 hp. You probably wouldn't even notice that difference on a car with stock twins.
Manufacturers today have cars like the Corvette pushing 700+ horsepower and they have 2-4 cats. Set your exhaust up right and you will have plenty of flow and stay away from the headaches and poison to your lungs and the environment associated with running catless. |
Resurrecting an old thread here, but does anyone know if SMB are still in business?
The website either errors out or displays poorly whenever I try...... Thanks! |
FEED AFFLUX v5
Resurrecting an old thread here, but does anyone know if SMB are still in business? The website either errors out or displays poorly whenever I try...... Thanks! I read on this site that Marcus Read who sells FD parts on Facebook has contacts with SMB and might be able to get batches of exhausts made. https://www.facebook.com/profile.php?id=527820134 I had to put my 3" resonated SMB highflow cat on my car to stop the boost creep with stock twins. It will run 12psi with the SMB high flow cat, but was creeping to 17psi with 4" downpipe back open exhaust. I tried a 3" resonated midpipe and even with that it was creeping to 15 or 16psi. So anyone that says highflow cat flows well- not really; but it can be a useful restriction. Problem is, I just looked at the SMB cat and its starting to lose its shape finally after running with no emissions (airpump). Don't know how much longer it will last with my abuse. It blows some big flames through it if I just wing it up to the 9,000rpm rev-linit which I was not expecting. |
Originally Posted by BLUE TII
(Post 12334206)
I read on this site that Marcus Read who sells FD parts on Facebook has contacts with SMB and might be able to get batches of exhausts made. https://www.facebook.com/profile.php?id=527820134 I had to put my 3" resonated SMB highflow cat on my car to stop the boost creep with stock twins. It will run 12psi with the SMB high flow cat, but was creeping to 17psi with 4" downpipe back open exhaust. I tried a 3" resonated midpipe and even with that it was creeping to 15 or 16psi. So anyone that says highflow cat flows well- not really; but it can be a useful restriction. Problem is, I just looked at the SMB cat and its starting to lose its shape finally after running with no emissions (airpump). Don't know how much longer it will last with my abuse. It blows some big flames through it if I just wing it up to the 9,000rpm rev-linit which I was not expecting. Mike |
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