passing CA Emissions with turbo kit

MetalShark · 08-19-2008, 09:49 PM

hi i have been thinking and researching this for quite some time I have a turbo kit that is being cleaned up and soon it will go on my car. I think I can pass emissions just by changing up the exhaust.

My plan is to get a full 3" exhaust all the way out to a flowmaster 3" inlet 2.5" outlet.

I will move the second O2 sensor down further so i can fit a bolt on 1.5" stock cat on it. by doing this I expect to get:
Little noice (so it wont sound modded),
little air flow (so the turbo wont spool),
and no conflicting ECU problems (like ones you would get if you ran no cat).

it will be a bolt for emissions test, pass, then bolt on straight 3" again

how does this sound?
Im open for sugjestions.
or if you have tryed it I would like to know the outcome.

cclngthr · 08-19-2008, 10:30 PM

You can have the turbo installed with a cat. You will cause problems with a 3 inch exhaust though. The exhaust will be too cool for the cat to work effectively. It will work with a 2.25 inch exhaust.

Dragonis · 08-20-2008, 01:17 AM

your gonna fail the visual test unless you have either papers or pay someone to ignore it. The o2 moving will work just as long as one is in front of the cat and behind the cat. also you need to have the stock ecu or else you will fail that test as well.

MetalShark · 08-20-2008, 03:48 PM

going from a 3" pipe to a 1.5" cat will make the cat fail?
I thought a suddent change from 3" to 1.5" would compress the air and slow down the flow i dont plan on having the cat too far from the engine.

Im not worried about the visual test I got enough black paint to make anything look stock. and its not like they know about hyundai engines enough to know its not.
as for the ECU yeah its stock only apexi neo hooked to it.(for tuning the turbo)

Dragonis · 08-20-2008, 05:57 PM

your gonna blow your cat or cause a back fire back into your engine which is also as bad. I dont recommend using a 1.5" cat at all. Also you need to know that when you smog, they run your car on a roller so they will rev the engine.

omeletduefromage · 08-20-2008, 06:44 PM

you can just buy a racing cat. thats what i did for my test. but im in nj so i dont know its that much different but it worked. and as far as the mods i just payed the guy 50 bucks and he blew it off. its better if you dont go to the dmv either for the emissions test. go to a body shop that does that sort of thing and you can get away with alot more and pay off the guy.

cclngthr · 08-20-2008, 08:26 PM

The stock cat is not 1.5 inches. The inside diameter of the tip is 1.8 inches. The stock cat is 2-2.25 inches.

1SickGS · 08-20-2008, 11:44 PM

People aren't stupid here in CA. You are never going to pass the visual without bribing someone. If you are in the NorCal area, I know some people...

PacificIslander · 08-21-2008, 01:13 AM

Give it a try see if it will work out for you. As long as you do everything right you will pass the emissions test, but the visual can be tricky. I live in S.Cali and I had my accents mostly stock do the smog test in different test sites. Some of them check for visual and some just kinda do glance over. So if you can make things look similar to stock and pass let me know where you got smogged. Or even if you have to bribe someone still let me know. So I know where to go to get my car smogged in the future. Good luck.

i8acobra · 08-21-2008, 02:50 AM

Just having a turbo on a car that didn't come with one from the factory is an instant fail without a CARB EO#.