I have a 85 t/a with the 305 tpi and auto. The mods are listed below in the sig. I want to put kenny brown sfc's on next year .I think i have to drop the cat down to put them in . Can i take the cat off and then have a shop put a piece of pipe in . WIll the car run sh*tty , I have a straight exhaust now, no muffler, i love how it sounds, and it doesnt sound like a hick truck. I lost some low end when i took the muffler off , but the gain in sound made up for it. Can i just take the cat off and have no problem. I know theirs some pipe going into it , from the air pump?. I need some help . I dont wanna make my car run like sh*t , so i need some advice.

 

Hedman lt's and no cat= no problems and before the lt's I didn't have a cat and didn't have any problems. I would say you should be fine.

 

Oh and its going to get louder without the cat.

 

you didnt lose "low end" trust me.

people run with no cats all the time.. how would that make it chitty? Cat has no real function on making the car run better, just so that all the exhaust gasses are cleansed.

an yeah.. its gunna get a lot louder.

 

good , i like loud, i just wanted to make sure that the car would run fine, I guess if their arnt any sensors in it so i should have no problem.Whats the weapon of choice to cut it off, i got a sawzall. And what do i do with the aior tube, i dont think i should plug it , just leave it hanging there .

 

you got it..sawzall that ****!!! and with the air tube.... you could remove it along with the air pump.

 

i dont wanna remove the air equiptment. Will i loose backpressure and make my car even slower. I allready ahve no muffler.

 

the less backpressure the better. you can get rid of all the AIR stuff and not lose anything, if anything u'll gain like 3-4 hp but not noticable.

 

some shops will insist that you have a Cat on it and most wont even touch a car without a cat. the best thing to do is just get a pipe and cut it to lenght then slide it in there or else find another cat preferably with the same size pipe as you are running and knock out the comb and shove a pipe straight thru so it looks like you have a cat then have the darn thing welded.

the only good Cat is a dead cat.

 

Why would you want to leave the A.I.R. without the cat it is only there to help the cat function when it is cold anyway.

 

beacuse i dont know how to take all the air stuff off , and it might just me easier to leave it on.I dont plan on keeping this engine much longer so i dont wanna f with it. SO if i keep it stock it easier to sell to some one who wants a stock engine for a rebuilt.

 

You buy pipe caps for the manifold and just remove the pump and anything attached to it and it is just that simple. Just make sure the wires don't touch the manifolds when you are done and you are golden.

 

The AIR helps the combustion process by aiding the catalyst. 1) Because on some vehicles the exaust temps are too low, 2) Because added o2 makes a complete burn.

-- Joe

 

Air pumps were made to reduce emissions, but if you tune your car right, you dont need it. It was a stop-gap thing durring the 60's and 70's to improve emissions. There are tons of people that have passed w/o it on... just hope there is no visual.

 

I was wondering why he would remove the cat but leave the A.I.R. it doesn't make sense at all sense the AIR is there for the cat to function.

 

Oh. I was resoponding to simply what the PUMP did.

Personally, I don't know why anyone would risk the felony conviction and $2,500 fine to run a car without the mandated federal emissions (regarless if your state does testing or not).

BTW.. All states "have emissions" under federal law. However, states are allowed to "not test for emissions" if they have a fuel supliment program (like New Hampshire). These states run up to 16% MBTE additives to the fuel which makes the car run cleaner, and produce less emissions.

-- Joe

 

anesthes I see what you mean I just thought you had misread my post. I understand what the pump is there for I just don't get why you would leave it without the cat. You do know that most motor swap also violate federal emmisions laws in one way or another so should we stop doing them?

 

Law says that you cannot go backwards. Whats wrong with that?

If your driving your car on the street, you should maintain emissions from the year your car was produced, or newer (as allowed by law).

-- Joe

 

You are right and I agree for the most part. I know mine is not 100% legal right now but it is not done yet and hpefully soon it will be just a play toy not my daily driver.

 

i wanna take the cat off when i have sfc's put on the car and i want the car to be louder. Maybe if it wasnt a real pain to take the pump off and get the right belt i might do it. But i wanna know if it will be ok to take the cat off and leave the air stuff.I just wanna make the car a little louder,Im not looking for performance from this or a wieght reduction, i just want the sound.The stock 305 sucks i want a crate engine in a year or two s oi dont wanna put time or money into doin the air removal.

 

I'd leave the cat on and get a better muffler. Your state has emissions testing anyway.

And a crate 350 won't net you much over stock really, get something custom.

-- Joe

 

You have an 85 which means all you have to do is remove the pump and hoses and take the belt for the smog pump off and throw it away and cap the ports on the manifold. If removing the mog pump is scaring you I would think twice about an engine swap. Oh and if you do have emissions I would just leave it all alone.

 

I took off my cat and put a header cutout in place of it. The Air stuff has to go(drag on engine) With no muffler and no cat, the sound turns into this raspy moisy air mixture.. But sounds cool at the drag strip

 

anesthes , what a crate 350 wont be that good , huh. Im gonna buy the burt greenwald fast burn 385 with the hot cam , thats 430 hp . I dont wanna remove the pump becasue i cant , i dont wanna remove it because i dont want to do anything to the engine.

 

That ZZ430 HP is carb'd. It would be arround 360 HP with a vortec TPI setup (if you plan on staying TPI).

 

hell no, i'm goin carbed .i want the 430 hp .

 

You are not doing anything to the motor by removing the pump just reomoving an unneeded accessory. It also frees up tons of room on the passenger side.