Dan Martin

I think you might have posted this in the wrong thread.

MrHeeltoe

iTrader: (1)

And yet almost all the Magnaflow cats are available with O2 bungs...

They do that because some cars have O2s in the cat...OBD2 or not. This is not the reasoning for the certification. I am telling you, it is a government symmantic bullshit thing....

Bill Hook

Folks were interested in O2 sims and this is the only one I've found that actually works on OBDIIb.

I'm kinda interested in hear if the hi-flow cat throws a CEL after a few months, as it seems some are wont to do on other H/A vehicles.

Dan Martin

Ah, now I see. I didn't click on the products page, I just saw a story about the CRX.

JTso

iTrader: (2)

That ECG O2 Sim is designed by an online buddy of mine who lives in CA. I assisted in connecting the secondary O2 sensor data via an OBD2 scan tool. We logged readings from cold start, fully warmed up in idle, as well as various rpm points. He then designed and programmed the sim to mimic the O2 sensor reading.

Btw, a functional high flow cat shouldn't throw a CEL.

dzuy

stop posting and start racing!



:troutslap <- jtSLOW

stphy32

I thought it was illegal to touch the CAT?

TinkySD

Only in select states...like california.

stiffy: is that a gremlin in your avatar?

stphy32

no that is my puppy BeBe, she is a Lhasa Apso. Isn't she soooo cute??? I know they do look like Gizmo, the nice Gremlin )

stphy32

p.s.-- I think they are sooo much cuter than short haired rat looking dogs

dzuy

uhh...

it WAS illegal? so now its legal?

haha



:troutslap <- stiffy's cat is not illegal.

stphy32

I love how my words always get turned around

rmpage

I'm curious about this since I'm mulling over a move back to San Diego myself. It is illegal to even alter the emissions system one iota, but how do they verify this? A regular OBD2 emissions check or a tailpipe-plunging smog test will not detect an alteration if it is done correctly.

If they look under the car, they'll see the cat, but do they know exactly what the OE cat looks like or have some sort of part number for it or something? I can't think of any other way they would know it was modified.

MrHeeltoe

iTrader: (1)

Technically, it is illegal to remove a working cat wherevery you live. Even if you are replacing it with another working cat! Federal Law.

It just to happens that many locations, including california, have stringent emmissions laws where the cat-integrity is better enforced. Just because you live in AZ, and your smog checks won't require a sniff of the tailpipe, does not mean a cat removal is legal.

jonnerd154

So where did HeelToe's cat fab project end up?

rmpage

Waiting on Magnaflow's new cat, which is supposed to be better than the one I used.

JTso

iTrader: (2)

Any model # or description of this "new" cat?

SMSP

FYI,

There are many different models of cats from each manufacturer.

Here's some good info on some testing I had done.

http://honda-tech.com/zerothread?id=1128725

http://honda-tech.com/zerothread?id=1323923

And if anyone needs any of the special "house" flanges I had them custom made for 2-5/8" ID to go over the ends of 2-1/2" cats. Stock flange on the right.

JTso

iTrader: (2)

Hey Dave, is that the flange for a TSX? It looks a little different than the one I made, which is an exact trace of the existing flange. Perhaps it's just the shape is different. The hole spacing kind of look the same... I'd be interested in getting some flanges from you for some custom works.

Zasker1

Same question, do we have a turnkey solution available yet, or does it still require some custom fabrication/

SMSP

My house flanges have a centerline bolt spacing (long sides) of about 3.5" and on the short side about 2.5"

JTso

iTrader: (2)

Hmm... Just a heads up, you might need some new flanges for the TSX. The TSX flange bolt spacing (center bore) long sides is about 107mm or 4.21", and the short side is about 68mm or 2.68".

Here are some measurements. I listed the mounting holes being 12mm for using nuts and bolts. The actual hole size should be 11/32" to be tapped with M10x1.25 thread to install studs.

MrHeeltoe

iTrader: (1)

1) I am waiting for carsound to releast their new cats.

2) The dyno someone did did not look very promising....

JTso

iTrader: (2)

Don't give up yet. I should have another dyno soon with a different cat that uses slightly different length and pipe dia. The dyno will be done with a catback system.

SMSP

Like I said before Carsound has many mnay different cats, but I listed one in the links above that has just smoked all of them and many other cat manufacturers.

dzuy

i'm going to have another high flow cat solution soon.

my exhuast has been hitting something under the rear of the car - i looked today and it might be the heatshield in the rear.

i have experienced rattles like a mofo since i put on the cat.

more info soon.

rmpage

That 200 cell spun body cat sounds awesome. Have you had any luck with customers using it on OBD2 vehicles?

MrHeeltoe

iTrader: (1)

Yea, the metal substrake cats are the bomb...

are they out already? Looks like I need new freinds over there.

rmpage

As an aside, I'd like to know more about how the cats were tested for flow resistance, because I thought about trying something similar. I was going to use an industrial blower and a mercury air pressure gauge, then record backpressure at a set volume for the OEM cat and then the Carsound. It sounds like these were tested in exactly such a manner.

SMSP

The cats are OBDII compliant per the manufacturer for up to 4.0L 4250lbs. I have one customer who is running one in an OBDII application for about a month now with no CELs.

With the B Series VTECs they tend to run rich in VTEC so they are a bit harder to get good results thus I've been using large universal cats, some rated up to 7.5L and 10,000 lbs. I'm not familiar with the stock program for these K series so I'm not sure how rich they run up top. However, I should be getting educated shortly.

But currently I offer these 200 cell cats more for OBDI applications but that may soon change.

They were tested on a Superflow Flow Bench at Jim Justice's shop in Frederick, MD. Baseline was the adapter used to attach all the 2-1/2" cat to the flow bench, then each cat was flowed in both directions at a delta of 28".

JTso

iTrader: (2)

I want one of those spun body 200 cell cat.

rmpage

So do I.

How's your second effort coming along? I'm looking forward to the new B pipe/flex pipe and whatever the new cat you're going to be using.

Also, did they ever get you a dyno for the Hyper Medallion?

JTso

iTrader: (2)

Well, I have a slight change of plan. Instead of using the new larger flex pipe for the next test, I'm keeping the existing pipe dia on the header, but extended the cat inlet sligthly longer with the same inlet dia as the header, which effectively lenghten the header A pipe. I then matched the shorter cat outlet to the catback exhaust. This particular arrangement seems to yield better throttle response than the previous setup.

I still have two more tests to go if I can get a hold of perhaps two spun body cats. One would be configured the exact same way as the current carsound cat (I just want to see how much better it is). The other one will be utilizing the larger flex pipe and header collector with the same cat inlet/outlet dia. I just pickup some metal plates to make more flanges for the next test.

I have an in-car camera mount coming tomorrow. So I might record some video/audio of the catback system. Perhaps some 0-60 runs as well. If situation permits, I might take it to the dyno and get some numbers.

SMSP

JTso,

Just do some timed acceleration runs. 2nd or 3rd gear, 3k-6k rpm. Floor it at 2K and start the clock at 3k. Do it on a flat road, in both directions and throw out any data that looks obviously wrong. Have someone else do the timing.

The best test and it doesn't cost you a dime.

JTso

iTrader: (2)

Thanks Dave for the suggestion. I'll see what I can do. I can also use an OBD2 scan tool to monitor the secondary O2 sensor output with different cats to see where the threshold is.

dxslow

any up date on the cats?