autopaul

ok, im just wondering, cause my brother and i were talking about ways of maybe cheating, or i guess not, really cheating, the aircare system we have here in the greater vancouver regional district. cause its not that easy for a modified fb to pass,

so what he suggested to me was to try putting a large venturi in there, somewhere that youll get the least backpressure, and then have it draw in clean air from somewhere, or maybe just use a small 12v air pump, blower of some sort, hidden.

the idea is that you dilute the air going out the exhoust and showing the sensing devises that you have a lower emission... especially for those of us not running an air pump...

i know the idea behind having air pumped into the cat, is so that you have extra oxygen pumped in therefor allowing the gasses to be burnt off more efficiently, and actually reduce emmisions but i dont think a venturi would work with that much backpressure, i may be mistaken,

so i want a way to get more oxygen coming out the tail pipe iether way, just wondering what you guys have done, especially all you in california,


thanks

Paul

steve84GS TII

The secondary air injection is a factory calibrated system that introduces just enough air into the exhaust to do the job.Adding more air into the exhaust stream(especially after the cat) wont help,and will likely cause you to abort the smog test.
Excess oxygen dillution will usually end a smog test well before any readings are logged.If theres a substantial exhaust leak,itll cause oxygen dillution and also allow pollution to exit the system before being processed.Thats why oxygen dillution stops the test,its a sign of a problem and basically means instant failure.Intentional air induction with something like what your talking about would likely be viewed as tampering and will result in failure of the visual test.At the very least,itll just make you fail the sniffer test,if they dont notice the contraption.
Sometimes dillution is caused by too large an exhaust tip,or not having the probe inserted far enough into the tailpipe.Usually in this case,the tech will stuff some non flammable rags into the tailpipe to prevent outside air inducton and subsequent oxygen dillution of the exhaust gasses.

autopaul

ya but take into account i dont have an air pump, and i dont think id be able to introdice enough oxygen into the system to stop the test, just enough to be more than theair pump would supply, i think the amount of oxygen that will trip the stop test is for pretty substancial leaks, so i think it will be ok..
and injecting air after the cat should work to dilute the exhoust and trick the machines into thinking that my emissions are slightly lower/... just enough...

steve84GS TII

Injecting air into the exhaust after the cat wont hardly do a thing to lower the HC or NoX your engine is producing.The cat itself doesnt actually burn wasted fuel.The heavy elements inside are catylists that induce comsumption of the HC through normal oxidation,provided there is enough oxygen entering the cat.Under normal usage,there should be very little oxygen left exiting the cat,which indicates the oxygen was used up in proceesing the HC.All youll be doing is making HC,NoX and oxygen soup,without actually processing or reducing anything.

Instead of think up elaborate plans to fool the smog techs,why not just install an airpump and feedpipe for temporary testing......also,if you have a cat still installed and no air injection, I garauntee its gone nuclear by now and is doing nothing but hindering exhaust flow out of your engine.

The smog control devices dont hinder performance provided you install a modern cat in place of the old pellet cat.The smog pump only draws a HP or 2 at the most and the ACV/rats nest does nothing to hurt performance other than a few lbs of weight.
Yes,Im in CA and yes I pass current CA smog tests every 2 years with no issues.300HP and I still run a cat and smogpump,ACV,rats nest,ect.Turbo or not,EFI or carb,airflow is airflow and my cat/airpump does nothing to hold me back,and its clean running with no worrying when smog time comes around.
I ran even cleaner with my old 12A setup and it was modded as well.Even with headers you can pass the sniff test provided you retain a good cat and the engne mounted smog controls.Im not trying to throw a wrench in your plan,I just dont understand why everyone insists on pulling the smog gear off when theres little to gain,then they try to figure out how to circumvent the laws which they intentinally made themselves non-compliant to.......

racintang

rejet the carb if you have one

autopaul

ya,, im working on an fi 12a right now, but i this thread is half for my other car and half for my daily driver, and half just thinking about what ill do to pass smog when my rx is finished, i really really dont feel like drilling out the broken bolts stuck in the airpump if i even still have it so i think ill just get an electric air pump off of a late 80's v8 firebird or camaro, instead, and throw in a 3inch cat, i just want my engine bay to be completely clean, aka all my emmisions stuff is gone, cutom intake, side mounted alternator, electric fans, etc just to make the engine bay cleaner, i dont want to bug it up with a big old air pump, and stuff, so i wanted to think of alternatives that can be easily removed.

thanks for the input steve84gsTII that information will serve me well you obviousely know allot more about emmisions than i do, thanks for the help,...

LokiRx7.1

iTrader: (1)

If you are in SCCA-R or something related, then you want all the HP possible. If you are driving and primarily getting street use from your car get an aftermarket Hi-flow cat. The gain you will get from removing this equipment will be negligable at best. any aftermarket cat back exhaust will do. I run with no cat and no emissions at all, but I live in good 'ol ohio and we dont have any regulations here. the only engines that need to have emissions removed are the ones that make 400-500+ HP or more. I have a friend pushing 600 HP out of a 2001 Trans Am with a Borla cat back system. get a 2 1/2 inch maybe a 3 inch exaust bent up by a muffler shop and get a hi flow cat. you will never feel the difference, trust me. I had a stock cat, then I went to a rotary engineering Hi-flow cat (no longer in production) and then I went to no cat when that one bit the dust. Dont worry so much about it, start getting onto other things to boost your HP.

LokiRx7.1

iTrader: (1)

You can have an air pump chromed out BLING BLING!