Inexpensive high flow cats

Saw a thread in LT1 section about cat's and big cams. Some days the smell of the exhaust fumes makes me want to puke. :barf: What are some of the inexpensive high flow cats and how much do they go for locally?

if ur exhaust stinks A LOT at idle, its in ur tune ... take out 2 degrees out of ur idle timing ...

try that first ...

Originally posted by sideways_Into_3rd
if ur exhaust stinks A LOT at idle, its in ur tune ... take out 2 degrees out of ur idle timing ...

try that first ...

Idle timing table is completely separate from cruise/WOT right? Soon as you break out past idle the whole table changes, am I correct?

Originally posted by NiteRider
Idle timing table is completely separate from cruise/WOT right? Soon as you break out past idle the whole table changes, am I correct?

yes

its not the "idle" timing table .. its the zero throttle table .. it goes thru the whole rpm range .. so it controls ur idle timing and decel / coast timing when ur throttle is at 0%

Fascinating payam joun, although i'm very happy with my tune, shout out to bunker for mad tuning skillz, i'd rather leave the tune alone.

As for air care, high flow cat vs stocker, is the difference that big? I guess when trying to get my car through air care I shouldn’t risk anything.

Originally posted by NiteRider
Fascinating payam joun, although i'm very happy with my tune, shout out to bunker for mad tuning skillz, i'd rather leave the tune alone.

As for air care, high flow cat vs stocker, is the difference that big? I guess when trying to get my car through air care I shouldn’t risk anything.

ur tune is fine . just need to shave off 2 deg off idle timing if u want it to sink less (way less)

what u say ? AIRCARE :lol: HAHAHAHAHAHAHAHAHAHAH... *breathe* .. :lol: HAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHAHHAAHAHH

oh man ..

I'm not too worried about air care. The cam won't be that stubborn when it comes to emissions and will defiantly pollute less then a 306.

Originally posted by NiteRider
I'm not too worried about air care. The cam won't be that stubborn when it comes to emissions and will defiantly pollute less then a 306.

how u figure Dr Cam ??

Because of the way my cam's durration is advertised. The 0.006 lift duration on the 230/236 is a degree or two higher than a hotcam. Your 306 cam also has 230 degrees of intake, but the advertised duration on it is 292 where my 230/236 is 282. Weird cam man, read up alot yesterday and today at work. Aircare will prove interesting.

Originally posted by NiteRider
Because of the way my cam's durration is advertised. The 0.006 lift duration on the 230/236 is a degree or two higher than a hotcam. Your 306 cam also has 230 degrees of intake, but the advertised duration on it is 292 where my 230/236 is 282. Weird cam man, read up alot yesterday and today at work. Aircare will prove interesting.

When do u plan on doing aircare? I'd be interested to see how easily u pass. I like the way ur cam sounds and performs. I'd be interested in it if it passes aircare

Originally posted by SBainsTA
When do u plan on doing aircare? I'd be interested to see how easily u pass. I like the way ur cam sounds and performs. I'd be interested in it if it passes aircare

Don't worry Sandeep, I will stop at nothing! Btw you have a PM, check your mail box.

its true that ur cam has less lift at .006 than mine does (10 degrees) big deal .. it still lifts the same amount for teh same duration past .050 which is what really counts

this debate will really go no where .. just go thru aircare and see if ur 2x off the limit or 50x

doubt u'll pass with that cam .. doubt i'll pass either

but i guess we can all try

I know you won't pass. I might have a chance payam joun. We can debate all you want. ;)

Not gonna go to air care till 05

i dont need to worry about aircare ...

i'll go thru with a 8.5:1 355 with a CC305 cam and proper cats ;) should fly thru no problem

then i'll slap on the extra "air" ;)

the cheapest cats with the highest flow would be stock ls1 cats, only one company out flows them.

Originally posted by 93formula
the cheapest cats with the highest flow would be stock ls1 cats, only one company out flows them.

Would that be random tech?

Armen, I have heard and smelled your car. Methinks you will not be simply breezing through Aircare.
As for Randoom tech cats I have personally seen less than stellar results with them.
The Walker 151 series work reasonably well although they have come up with better cats that at this point are unavailable.

One thing to note, just because your O2s look good on Datamaster at idle, that does not mean you are actually at the correct mixture.
Because of overlap you have free oxygen in the exhaust that the sensor looks at. The end result is the mixture ends up being rich at idle even though the PCM thinks it is doing a fine job.

Let me know if you are in the market for cats and I will get you prices on stuff I can get.
Regards, Gerry

Thanks Gerry, I will let you know when the time comes. As for aircare yes i'm thinking it will be more then a few trips to the rollers. :( To bad the only readings they give are emissions. :mad:

IMO anyone with a "large" cam needs to tune in closed loop for idle and emissions ... for the exact reason gerry mentioned . ur O2s are useless cuz they get fooled by the overlap ...

just turn those things off at idle, tune ur mixture in the open loop tables, slap some 315s on the back and go do the idle test (some places wont put it on the rollers with u have wide ass bling blings on the back) .. like i did with rickerby's car when i took it thru aircare

Originally posted by sideways_Into_3rd
wide ass bling blings on the back)

Yeah , the peasants have been using studded snows for the same purpose.
I assume you meant "open loop"?

Woulden't a larger cam with more overlap, i.e. 112 lsa, be worse for a idle test?

yah but u gonna have to pass the idle test ANYWAY .. so if u only do the idle test u only have to worry about tuning for one thing, aka the idle mixture ... and not worry about the rest of ur tune

This is true, although i'd like to get 2 year pass and it's defiantly worth a try or even many tries. :cool: