Okay guys, ive read about 5 threads on putting alcohol in your gas tank in order to pass smog, okay, so i did that, but the stuff i got smelt like rubbing alcohol. I put about half a gallon in my tank wich was at 1/4 mark, and i ran a 1649 HCO when the limit is 220, no i have NO EMISSION EQUIPMENT ON MY CAR!! i want to stress that because people will tell me to replace stuff and what not. i also only have the first 2 cats on my car, the 3rd one is gutted, people said that you can still run the alcohol with out a cat and still pass, but my question is, what can i do and pass with MY setup? mods in my sig.. like how much alcohol (and what kind) do i need in my tank? and how much gas do i need in my tank.. thanks guys!!

 

bump... i really really need help

 

Probably your best option is to get a stock air pump, a generic check valve and some tubing. Run the tube into the exhaust just in front of the catalytic. Mazda says this is to help the cat burn more nasties off, I say its to dilute the exhaust enough to squeak by. I've seen a similar setup (jammed the ACV open) pass in Ohio.

Slight nitpick, you dont have 'NO EMISSIONS'. You still have cats on there, which do most of the work anyway.

 

Alchohol will do the trick but it will also EAT all your rubber seals.....

 

^ yeah if i run it everyday! what ratio do i need to run?

 

Im HIGHLY,HIGHLY doubting your gonna get anywhere near the limit without any cats or air injection.The fact that you have the precats is moot since they are reduction catylists that work in conjunction with the main cat.They arent needed if you install a modern 3 way catylist in the primary position.
Rotaries need air injection to allow the cat to process.They leave very little usable oxygen in the exhaust stream and put out a large amount of unburned hydrocarbons to boot.This is why all rotaries have smog pumps when most cars had been able to do away with them after the 80s.Its also why they are so hard on their cats,stock or otherwise.The excess HCs generate a lot of heat when catylizing.
Id track down an air pump,main cat and ACV,then consider yourself lucky you dont have to get the HC below 120ppm like some of us poor slobs in CA!

 

Also with the cats you did it backasswards!!! you gutted the main cat, and left the pre cats that basicly do ****!!!! those two pre cats inline restrict the flow more than the one main cat.

 

but the thing is, ive seen people on here run the alcohol without any emissions, with a full rb exhaust. remember, i have a 45 dcoe, on a gsl-se engine... so i dont know if that would help//

 

run the alchohal dry first then mix with gas when you go to get it tested... dont mix fully more gas then alchohal........pretty sure this is how you do thats how we have passed all the other cars we got

 

True,the precats are restrictive,but thats usually because they break up and deteriorate before the main cat.
Heres the bottom line on the cats......
If you run the factory main cat,you need to have the precats working.Delete one or the other and you wont be doing all the work needed to scrub the exhaust.

If you install a modern 3-way main cat (which is highly recommended because the stock main was big,heavy and restrictive),then you can punch out or remove the precats and you will still pass a sniffer test.
3-way cats do the work of the old seperate precats internally,so they are no longer needed.
Without the precats,you may not pass a visual test in stringent states like CA,but you will be clean as a stock setup and will pass sniff tests in other places that dont do visual ****-type testing like CA.

 

Well sorry to burst your bubble. But without that main cat and the air pump feeding it air you are not going to pass. You can put all the alcohol in you want, hell try tequila, bacardi 151,lol. It will not make a difference. Remember we have the dirtiest running motors on the planet. Thats why we have such an alaborate emission system when it is stock. 3 cats, air, deacceleration cutoff, acv, etc.
On top of this your running a weber. After you follow your fellow members advice on the main cat and air pump, then you can add your alcohol. Then you stand a chance of getting thru. rx7doctor

 

wow, that sucks alot of big nuts, but where i live i can only get 1 temp tag, wich only last for a month, and this sunday my temp tag expires... so i guess its bye bye for me driving my car for a while..

 

did you run it real hard before your test? Get it nice and hot. run the best gas you can get. I know people have said they have past by running alcohol but im not sure of their ratio.

 

i dont know if a temporay OMP disconnect would work.. its daring but it may just work.... or ruin your engine

 

Unfortunatly, your gonna need a cat. I am in an Emissions class here at school and we are learning and experimenting with different emissions set-ups, so far we have not gotten one engine to pass without a cat no matter what gas and how tuned the engine is, and this is all on boingers, so our rotories dont stand a chance. However, we have gotten several of the engines to pass after disconnecting the AIR system. The hotter the cat, the more work it is doing, but watch your carpet! alcohol will lower your #s, but can be VERY dangerous on an improperly tuned engine, and isn't the best on a cat. Tomorrow we are trying nitrous to see what happens to emissions hehe

 

Send me your title and some $$$ or move to Georgia ( except Atlanta ).

I'm originally from Memphis, but don't know anymore if Tennessee stops testing after it's an antique ( 25 years old ) ? I do know all counties in Tennessee don't test.

 

well i got a cat now, and buying alcohol tomorrow, wish me luck *******